moves all subsystems to length (#19168)

2026-07-19 02:56:14 +01:00 · 2026-02-15 15:34:14 +01:00
parent ae6f945e05
commit a55b487389
50 changed files with 266 additions and 269 deletions
@@ -17,7 +17,7 @@ SUBSYSTEM_DEF(ai)
 	var/list/process_z = list()

 /datum/controller/subsystem/ai/stat_entry(msg)
-	msg = "P: [processing.len] | S: [slept_mobs]"
+	msg = "P: [length(processing)] | S: [slept_mobs]"
 	return ..()

 /datum/controller/subsystem/ai/fire(resumed = 0)
@@ -26,16 +26,16 @@ SUBSYSTEM_DEF(ai)
 		process_z.Cut()
 		slept_mobs = 0
 		var/level = 1
-		while(process_z.len < GLOB.living_players_by_zlevel.len)
+		while(length(process_z) < length(GLOB.living_players_by_zlevel))
 			process_z.len++
-			process_z[level] = GLOB.living_players_by_zlevel[level].len
+			process_z[level] = length(GLOB.living_players_by_zlevel[level])
 			level++

 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun

-	while(currentrun.len)
-		var/datum/ai_holder/A = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/datum/ai_holder/A = currentrun[length(currentrun)]
 		--currentrun.len
 		if(!A || QDELETED(A) || A.busy) // Doesn't exist or won't exist soon or not doing it this tick
 			continue
@@ -13,7 +13,7 @@ SUBSYSTEM_DEF(aifast)
 	var/list/currentrun = list()

 /datum/controller/subsystem/aifast/stat_entry(msg)
-	msg = "P:[processing.len]"
+	msg = "P:[length(processing)]"
 	return ..()

 /datum/controller/subsystem/aifast/fire(resumed = 0)
@@ -23,8 +23,8 @@ SUBSYSTEM_DEF(aifast)
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun

-	while(currentrun.len)
-		var/datum/ai_holder/A = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/datum/ai_holder/A = currentrun[length(currentrun)]
 		--currentrun.len
 		if(!A || QDELETED(A) || A.busy) // Doesn't exist or won't exist soon or not doing it this tick
 			continue
@@ -117,15 +117,15 @@ SUBSYSTEM_DEF(air)
 	admin_notice(span_danger("Geometry initialized in [round(0.1*(REALTIMEOFDAY-start_timeofday),0.1)] seconds.") + \
 span_info("<br>\
 Total Simulated Turfs: [simulated_turf_count]<br>\
-Total Zones: [zones.len]<br>\
-Total Edges: [edges.len]<br>\
-Total Active Edges: [active_edges.len ? span_danger("[active_edges.len]") : "None"]<br>\
+Total Zones: [length(zones)]<br>\
+Total Edges: [length(edges)]<br>\
+Total Active Edges: [length(active_edges) ? span_danger("[length(active_edges)]") : "None"]<br>\
 Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_count]\
 "), R_DEBUG)

 	// Note - Baystation settles the air by running for one tick.  We prefer to not have active edges.
 	// Maps should not have active edges on boot.  If we've got some, log it so it can get fixed.
-	if(active_edges.len)
+	if(length(active_edges))
 		var/list/edge_log = list()
 		for(var/connection_edge/E in active_edges)

@@ -177,7 +177,7 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 		// Santity checks to make sure we don't somehow have items left over from last cycle
 		// Or somehow didn't finish all the steps from last cycle
 		if(LAZYLEN(currentrun) || current_step)
-			log_and_message_admins("SSair: Was told to start a new run, but the previous run wasn't finished! currentrun.len=[currentrun.len], current_step=[current_step]")
+			log_and_message_admins("SSair: Was told to start a new run, but the previous run wasn't finished! currentrun.len=[length(currentrun)], current_step=[current_step]")
 			resumed = TRUE
 		else
 			current_cycle++ // Begin a new SSair cycle!
@@ -216,8 +216,8 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 	var/list/selfblock_deferred = src.selfblock_deferred

 	// Run thru the list, processing non-self-zone-blocked and deferring self-zone-blocked
-	while(currentrun.len)
-		var/turf/T = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/turf/T = currentrun[length(currentrun)]
 		currentrun.len--
 		//check if the turf is self-zone-blocked
 		if(T.self_airblock() & ZONE_BLOCKED)
@@ -238,8 +238,8 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 	ASSERT(LAZYLEN(currentrun) == 0)

 	// Run thru the deferred list and processing them
-	while(selfblock_deferred.len)
-		var/turf/T = selfblock_deferred[selfblock_deferred.len]
+	while(length(selfblock_deferred))
+		var/turf/T = selfblock_deferred[length(selfblock_deferred)]
 		selfblock_deferred.len--
 		T.update_air_properties()
 		T.post_update_air_properties()
@@ -258,8 +258,8 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 		src.currentrun = active_edges.Copy()
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun
-	while(currentrun.len)
-		var/connection_edge/edge = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/connection_edge/edge = currentrun[length(currentrun)]
 		currentrun.len--
 		if(edge) // TODO - Do we need to check this? Old one didn't, but old one was single-threaded.
 			edge.tick()
@@ -271,8 +271,8 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 		src.currentrun = active_fire_zones.Copy()
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun
-	while(currentrun.len)
-		var/zone/Z = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/zone/Z = currentrun[length(currentrun)]
 		currentrun.len--
 		if(Z) // TODO - Do we need to check this? Old one didn't, but old one was single-threaded.
 			Z.process_fire()
@@ -284,8 +284,8 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 		src.currentrun = active_hotspots.Copy()
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun
-	while(currentrun.len)
-		var/obj/fire/fire = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/obj/fire/fire = currentrun[length(currentrun)]
 		currentrun.len--
 		if(fire) // TODO - Do we need to check this? Old one didn't, but old one was single-threaded.
 			fire.process()
@@ -294,8 +294,8 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun

 /datum/controller/subsystem/air/proc/process_zones_to_update(resumed = 0)
 	if (!resumed)
-		active_zones = zones_to_update.len // Save how many zones there were to update this cycle (used by some debugging stuff)
-		if(!zones_to_update.len)
+		active_zones = length(zones_to_update) // Save how many zones there were to update this cycle (used by some debugging stuff)
+		if(!length(zones_to_update))
 			return // Nothing to do here this cycle!
 		// NOT a copy, because we are supposed to drain active turfs each cycle anyway, so just replace with empty list.
 		// Blanking the public list means we actually are removing processed ones from the list! Maybe we could we use zones_for_update directly?
@@ -306,8 +306,8 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun

 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun
-	while(currentrun.len)
-		var/zone/zone = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/zone/zone = currentrun[length(currentrun)]
 		currentrun.len--
 		if(zone) // TODO - Do we need to check this? Old one didn't, but old one was single-threaded.
 			zone.tick()
@@ -324,14 +324,14 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 	msg += "H [round(cost_hotspots, 1)] | "
 	msg += "Z [round(cost_zones, 1)] "
 	msg += "}"
-	msg += "Z: [zones.len] "
-	msg += "E: [edges.len] "
+	msg += "Z: [length(zones)] "
+	msg += "E: [length(edges)] "
 	msg += "Cycle: [current_cycle] {"
-	msg += "T [tiles_to_update.len] | "
-	msg += "E [active_edges.len] | "
-	msg += "F [active_fire_zones.len] | "
-	msg += "H [active_hotspots.len] | "
-	msg += "Z [zones_to_update.len] "
+	msg += "T [length(tiles_to_update)] | "
+	msg += "E [length(active_edges)] | "
+	msg += "F [length(active_fire_zones)] | "
+	msg += "H [length(active_hotspots)] | "
+	msg += "Z [length(zones_to_update)] "
 	msg += "}"
 	return ..()

@@ -403,7 +403,7 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 	ASSERT(!B.invalid)
 	ASSERT(A != B)
 	#endif
-	if(A.contents.len < B.contents.len)
+	if(length(A.contents) < length(B.contents))
 		A.c_merge(B)
 		mark_zone_update(B)
 	else
@@ -427,7 +427,7 @@ Total Unsimulated Turfs: [world.maxx*world.maxy*world.maxz - simulated_turf_coun
 	var/space = !istype(B)

 	if(!space)
-		if(min(A.zone.contents.len, B.zone.contents.len) < ZONE_MIN_SIZE || (direct && (equivalent_pressure(A.zone,B.zone) || current_cycle == 0)))
+		if(min(length(A.zone.contents), length(B.zone.contents)) < ZONE_MIN_SIZE || (direct && (equivalent_pressure(A.zone,B.zone) || current_cycle == 0)))
 			merge(A.zone,B.zone)
 			return

@@ -30,8 +30,8 @@ SUBSYSTEM_DEF(airflow)

 	var/mywait = wait
 	var/list/curr = currentrun // Cache for sanic speed
-	while (curr.len)
-		var/atom/movable/target = curr[curr.len]
+	while (length(curr))
+		var/atom/movable/target = curr[length(curr)]
 		curr.len--
 		if(QDELETED(target))
 			processing -= target
@@ -19,8 +19,8 @@ SUBSYSTEM_DEF(alarm)
 		active_alarm_cache.Cut()

 	var/list/currentrun = src.currentrun // Cache for sanic speed
-	while (currentrun.len)
-		var/datum/alarm_handler/AH = currentrun[currentrun.len]
+	while (length(currentrun))
+		var/datum/alarm_handler/AH = currentrun[length(currentrun)]
 		currentrun.len--
 		AH.process()
 		active_alarm_cache += AH.alarms
@@ -32,7 +32,7 @@ SUBSYSTEM_DEF(alarm)
 	return active_alarm_cache.Copy()

 /datum/controller/subsystem/alarm/proc/number_of_active_alarms()
-	return active_alarm_cache.len
+	return length(active_alarm_cache)

 /datum/controller/subsystem/alarm/stat_entry(msg)
 	msg = "[number_of_active_alarms()] alarm\s"
@@ -43,8 +43,8 @@ SUBSYSTEM_DEF(appreciation)

 		current_player_list = GLOB.player_list.Copy()

-	while(current_player_list.len)
-		var/mob/M = current_player_list[current_player_list.len]
+	while(length(current_player_list))
+		var/mob/M = current_player_list[length(current_player_list)]
 		current_player_list.len--

 		if(ishuman(M))
@@ -66,7 +66,7 @@ SUBSYSTEM_DEF(appreciation)


 /datum/controller/subsystem/appreciation/proc/build_appreciation()
-	if(human_list.len < required_humans)
+	if(length(human_list) < required_humans)
 		appreciated = pick(loremaster.appreciation_targets)
 		return

@@ -12,7 +12,7 @@ SUBSYSTEM_DEF(asset_loading)

 /datum/controller/subsystem/asset_loading/fire(resumed)
 	while(length(generate_queue))
-		var/datum/asset/to_load = generate_queue[generate_queue.len]
+		var/datum/asset/to_load = generate_queue[length(generate_queue)]


 		last_queue_len = length(generate_queue)
@@ -59,14 +59,14 @@ SUBSYSTEM_DEF(atoms)
 	CreateAtoms(atoms, atoms_to_return, source)
 	clear_tracked_initalize(source)

-	if(late_loaders.len)
-		for(var/I in 1 to late_loaders.len)
+	if(length(late_loaders))
+		for(var/I in 1 to length(late_loaders))
 			var/atom/A = late_loaders[I]
 			//I hate that we need this
 			if(QDELETED(A))
 				continue
 			A.LateInitialize()
-		testing("Late initialized [late_loaders.len] atoms")
+		testing("Late initialized [length(late_loaders)] atoms")
 		late_loaders.Cut()

 	if (created_atoms)
@@ -76,7 +76,7 @@ SUBSYSTEM_DEF(atoms)
 	for (var/queued_deletion in queued_deletions)
 		qdel(queued_deletion)

-	testing("[queued_deletions.len] atoms were queued for deletion.")
+	testing("[length(queued_deletions)] atoms were queued for deletion.")
 	queued_deletions.Cut()

 	#ifdef PROFILE_MAPLOAD_INIT_ATOM
@@ -96,10 +96,10 @@ SUBSYSTEM_DEF(atoms)

 	if(atoms)
 		#ifdef TESTING
-		count = atoms.len
+		count = length(atoms)
 		#endif

-		for(var/I in 1 to atoms.len)
+		for(var/I in 1 to length(atoms))
 			var/atom/A = atoms[I]
 			if(!(A.flags & ATOM_INITIALIZED))
 				// Unrolled CHECK_TICK setup to let us enable/disable mapload based off source
@@ -12,19 +12,19 @@ SUBSYSTEM_DEF(character_setup)
 	var/list/save_queue = list()
 /*
 /datum/controller/subsystem/character_setup/Initialize()
-	while(prefs_awaiting_setup.len)
-		var/datum/preferences/prefs = prefs_awaiting_setup[prefs_awaiting_setup.len]
+	while(length(prefs_awaiting_setup))
+		var/datum/preferences/prefs = prefs_awaiting_setup[length(prefs_awaiting_setup)]
 		prefs_awaiting_setup.len--
 		prefs.setup()
-	while(newplayers_requiring_init.len)
-		var/mob/new_player/new_player = newplayers_requiring_init[newplayers_requiring_init.len]
+	while(length(newplayers_requiring_init))
+		var/mob/new_player/new_player = newplayers_requiring_init[length(newplayers_requiring_init)]
 		newplayers_requiring_init.len--
 		new_player.deferred_login()
 	. = ..()
 */	//Might be useful if we ever switch to Bay prefs.
 /datum/controller/subsystem/character_setup/fire(resumed = FALSE)
-	while(save_queue.len)
-		var/datum/preferences/prefs = save_queue[save_queue.len]
+	while(length(save_queue))
+		var/datum/preferences/prefs = save_queue[length(save_queue)]
 		save_queue.len--

 		// Can't save prefs without client, because the sanitize functions will be
@@ -24,7 +24,7 @@ SUBSYSTEM_DEF(chemistry)
 	return SS_INIT_SUCCESS

 /datum/controller/subsystem/chemistry/stat_entry(msg)
-	msg = "C: [chemical_reagents.len] | R: [chemical_reactions.len]"
+	msg = "C: [length(chemical_reagents)] | R: [length(chemical_reactions)]"
 	return ..()

 //Chemical Reactions - Initialises all /decl/chemical_reaction into a list
@@ -46,7 +46,7 @@ SUBSYSTEM_DEF(chemistry)
 		if(length(D.catalysts))
 			scan_list += D.catalysts

-		for(var/i in 1 to scan_list.len)
+		for(var/i in 1 to length(scan_list))
 			var/reagent_id = scan_list[i]

 			var/list/add_to = instant_reactions_by_reagent // Default to instant reactions list, if something's gone wrong
@@ -92,7 +92,7 @@ SUBSYSTEM_DEF(radio)
 	if(frequency)
 		frequency.remove_listener(device)

-		if(frequency.devices.len == 0)
+		if(!length(frequency.devices))
 			qdel(frequency)
 			frequencies -= f_text

@@ -157,8 +157,8 @@ SUBSYSTEM_DEF(radio)
 		devices[radio_filter] = devices_line
 	devices_line+=device
 //			var/list/obj/devices_line___ = devices[filter_str]
-//			var/l = devices_line___.len
-	//log_admin("DEBUG: devices_line.len=[devices_line.len]")
+//			var/l = length(devices_line___)
+	//log_admin("DEBUG: devices_line.len=[length(devices_line)]")
 	//log_admin("DEBUG: devices(filter_str).len=[l]")

 /datum/radio_frequency/proc/remove_listener(obj/device)
@@ -167,7 +167,7 @@ SUBSYSTEM_DEF(radio)
 		devices_line-=device
 		while (null in devices_line)
 			devices_line -= null
-		if (devices_line.len==0)
+		if (!length(devices_line))
 			devices -= devices_filter

 /datum/signal
@@ -389,7 +389,7 @@ Ignore_errors instructes mysql to continue inserting rows if some of them have e
 			if (has_col)
 				query_parts += ", "
 			if (has_question_mark[column])
-				var/name = "p[arguments.len]"
+				var/name = "p[length(arguments)]"
 				query_parts += replacetext(columns[column], "?", ":[name]")
 				arguments[name] = row[column]
 			else
@@ -586,7 +586,7 @@ Ignore_errors instructes mysql to continue inserting rows if some of them have e
 /datum/db_query/proc/NextRow(async = TRUE)
 	Activity("NextRow")

-	if (rows && next_row_to_take <= rows.len)
+	if (rows && next_row_to_take <= length(rows))
 		item = rows[next_row_to_take]
 		next_row_to_take++
 		return !!item
@@ -32,8 +32,8 @@ SUBSYSTEM_DEF(events)

 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun
-	while (currentrun.len)
-		var/datum/event/E = currentrun[currentrun.len]
+	while (length(currentrun))
+		var/datum/event/E = currentrun[length(currentrun)]
 		currentrun.len--
 		if(E.processing_active)
 			E.process()
@@ -45,7 +45,7 @@ SUBSYSTEM_DEF(events)
 		EC.process()

 /datum/controller/subsystem/events/stat_entry(msg)
-	msg = "E:[active_events.len]"
+	msg = "E:[length(active_events)]"
 	return ..()

 /datum/controller/subsystem/events/Recover()
@@ -51,7 +51,7 @@ SUBSYSTEM_DEF(explosions)
 		return

 	// The heavy lifting part...
-	while(currentrun.len)
+	while(length(currentrun))
 		// Lets handle list management here instead of in each proc
 		// get the first key of the current run, use the key to get the
 		// data, use the data, than discard it from the list using the key!
@@ -63,7 +63,7 @@ SUBSYSTEM_DEF(explosions)
 		currentrun.Remove(key)

 		// Check if we move on to final resolution
-		if(!currentrun.len)
+		if(!length(currentrun))
 			if(!resolve_explosions)
 				start_resolve()
 				currentrun = resolving_explosions.Copy()
@@ -94,7 +94,7 @@ SUBSYSTEM_DEF(explosions)

 	// return to setup mode... Unless...
 	end_resolve()
-	if(!pending_explosions.len)
+	if(!length(pending_explosions))
 		suspend_and_invoke_deferred_subsystems()

 /datum/controller/subsystem/explosions/proc/fire_prepare_explosions(var/list/data)
@@ -319,7 +319,7 @@ SUBSYSTEM_DEF(garbage)
 /datum/controller/subsystem/garbage/Recover()
 	InitQueues() //We first need to create the queues before recovering data
 	if (istype(SSgarbage.queues))
-		for (var/i in 1 to SSgarbage.queues.len)
+		for (var/i in 1 to length(SSgarbage.queues))
 			queues[i] |= SSgarbage.queues[i]

 /// Qdel Item: Holds statistics on each type that passes thru qdel
@@ -12,8 +12,8 @@ SUBSYSTEM_DEF(inactivity)
 	if (!resumed)
 		client_list = GLOB.clients.Copy()

-	while(client_list.len)
-		var/client/C = client_list[client_list.len]
+	while(length(client_list))
+		var/client/C = client_list[length(client_list)]
 		client_list.len--
 		if(C.is_afk(CONFIG_GET(number/kick_inactive) MINUTES) && can_kick(C))
 			to_chat_immediate(C, span_warning("You have been inactive for more than [CONFIG_GET(number/kick_inactive)] minute\s and have been disconnected."))
@@ -8,6 +8,6 @@ SUBSYSTEM_DEF(input)

 /datum/controller/subsystem/input/fire()
 	var/list/clients = GLOB.clients // Let's sing the list cache song
-	for(var/i in 1 to clients.len)
+	for(var/i in 1 to length(clients))
 		var/client/C = clients[i]
 		C?.keyLoop()
@@ -51,7 +51,7 @@ SUBSYSTEM_DEF(internal_wiki)
 	VAR_PRIVATE/highest_cached_donator = null

 /datum/controller/subsystem/internal_wiki/stat_entry(msg)
-	msg = "P: [pages.len] | O: [ores.len] | M: [materials.len] | S: [smashers.len] | F: [foodrecipe.len]  | D: [drinkreact.len]  | C: [chemreact.len]  | B: [botseeds.len] | V: [viruses.len] | G: [genes.len] "
+	msg = "P: [length(pages)] | O: [length(ores)] | M: [length(materials)] | S: [length(smashers)] | F: [length(foodrecipe)]  | D: [length(drinkreact)]  | C: [length(chemreact)]  | B: [length(botseeds)] | V: [length(viruses)] | G: [length(genes)] "
 	return ..()

 /datum/controller/subsystem/internal_wiki/Initialize()
@@ -218,7 +218,7 @@ SUBSYSTEM_DEF(internal_wiki)
 // Donating
 /datum/controller/subsystem/internal_wiki/proc/get_donor_value(var/key)
 	SHOULD_NOT_OVERRIDE(TRUE)
-	if(!dono_list.len || isnull(dono_list[key]))
+	if(!length(dono_list) || isnull(dono_list[key]))
 		return 0
 	return dono_list[key]
 /datum/controller/subsystem/internal_wiki/proc/get_donation_current()
@@ -241,7 +241,7 @@ SUBSYSTEM_DEF(internal_wiki)
 	var/list/distilled_list = SSchemistry.distilled_reactions_by_product[R.id]

 	data["instant_reactions"] = null
-	if(reaction_list != null && reaction_list.len > 0)
+	if(reaction_list != null && length(reaction_list) > 0)
 		var/list/display_reactions = list()
 		for(var/decl/chemical_reaction/CR in reaction_list)
 			if(CR.wiki_flag & WIKI_SPOILER)
@@ -281,11 +281,11 @@ SUBSYSTEM_DEF(internal_wiki)
 				var/obj/item/slime_extract/slime_path = CRS.required
 				assemble_reaction["is_slime"] = initial(slime_path.name)
 			reactions += list(assemble_reaction)
-		if(display_reactions.len)
+		if(length(display_reactions))
 			data["instant_reactions"] = reactions

 	data["distilled_reactions"] = null
-	if(distilled_list != null && distilled_list.len > 0)
+	if(distilled_list != null && length(distilled_list) > 0)
 		var/list/display_reactions = list()
 		for(var/decl/chemical_reaction/distilling/CR in distilled_list)
 			if(CR.wiki_flag & WIKI_SPOILER)
@@ -327,7 +327,7 @@ SUBSYSTEM_DEF(internal_wiki)
 			assemble_reaction["catalysts"] = catal
 			assemble_reaction["is_slime"] = null
 			reactions += list(assemble_reaction)
-		if(display_reactions.len)
+		if(length(display_reactions))
 			data["distilled_reactions"] = reactions

 	var/grind_list = list()
@@ -337,7 +337,7 @@ SUBSYSTEM_DEF(internal_wiki)
 		if(R.id in GLOB.ore_reagents[ore_type])
 			display_reactions.Add(initial(O.name))
 	grind_list["ore"] = null
-	if(display_reactions.len > 0)
+	if(length(display_reactions) > 0)
 		grind_list["ore"] = display_reactions

 	display_reactions = list()
@@ -346,7 +346,7 @@ SUBSYSTEM_DEF(internal_wiki)
 		if(R.id in GLOB.sheet_reagents[sheet_type])
 			display_reactions.Add(initial(M.name))
 	grind_list["material"] = null
-	if(display_reactions.len > 0)
+	if(length(display_reactions) > 0)
 		grind_list["material"] = display_reactions

 	display_reactions = list()
@@ -355,13 +355,13 @@ SUBSYSTEM_DEF(internal_wiki)
 		if(S && S.roundstart && !S.mysterious)
 			if(S.wiki_flag & WIKI_SPOILER)
 				continue
-			if(!S.chems || !S.chems.len)
+			if(!S.chems || !length(S.chems))
 				continue
 			if(!(R.id in S.chems))
 				continue
 			display_reactions.Add(S.display_name)
 	grind_list["plant"] = null
-	if(display_reactions.len > 0)
+	if(length(display_reactions) > 0)
 		grind_list["plant"] = display_reactions

 	data["grinding"] = grind_list
@@ -372,24 +372,24 @@ SUBSYSTEM_DEF(internal_wiki)
 		if(OR.reagent == R.id)
 			display_reactions.Add(OR.name)
 	data["fluid"] = null
-	if(display_reactions.len > 0)
+	if(length(display_reactions) > 0)
 		data["fluid"] = display_reactions

 	display_reactions = list()
 	var/list/instant_by_reagent = SSchemistry.instant_reactions_by_reagent["[R.id]"]
-	if(instant_by_reagent && instant_by_reagent.len)
-		for(var/i = 1, i <= instant_by_reagent.len, i++)
+	if(instant_by_reagent && length(instant_by_reagent))
+		for(var/i = 1, i <= length(instant_by_reagent), i++)
 			var/decl/chemical_reaction/OR = instant_by_reagent[i]
 			if(istype(OR,/decl/chemical_reaction/instant/slime)) // very bloated and meant to be a mystery
 				continue
 			display_reactions.Add(OR.name)
 	var/list/distilled_by_reagent = SSchemistry.distilled_reactions_by_reagent["[R.id]"]
-	if(distilled_by_reagent && distilled_by_reagent.len)
-		for(var/i = 1, i <= distilled_by_reagent.len, i++)
+	if(distilled_by_reagent && length(distilled_by_reagent))
+		for(var/i = 1, i <= length(distilled_by_reagent), i++)
 			var/decl/chemical_reaction/OR = distilled_by_reagent[i]
 			display_reactions.Add(OR.name)
 	data["produces"] = null
-	if(display_reactions.len > 0)
+	if(length(display_reactions) > 0)
 		data["produces"] = display_reactions

 /datum/controller/subsystem/internal_wiki/proc/assemble_allergens(var/allergens)
@@ -884,7 +884,7 @@ SUBSYSTEM_DEF(internal_wiki)
 	data["grind_reagents"] = null
 	if(GLOB.sheet_reagents[M.stack_type])
 		var/list/output = GLOB.sheet_reagents[M.stack_type]
-		if(output && output.len > 0)
+		if(output && length(output) > 0)
 			var/list/collect = list()
 			var/total_parts = 0
 			for(var/Rid in output)
@@ -905,7 +905,7 @@ SUBSYSTEM_DEF(internal_wiki)

 	data["recipies"] = null
 	M.get_recipes() // generate if not already
-	if(M.recipes != null && M.recipes.len > 0)
+	if(M.recipes != null && length(M.recipes) > 0)
 		var/list/recipie_list = list()
 		for(var/datum/stack_recipe/R in M.recipes)
 			recipie_list.Add(R.title)
@@ -941,7 +941,7 @@ SUBSYSTEM_DEF(internal_wiki)
 	if(data["grind_reagents"])
 		body += "<br>"
 		var/list/grind_list = data["grind_reagents"]
-		if(grind_list && grind_list.len > 0)
+		if(grind_list && length(grind_list) > 0)
 			body += "<b>Sheet Grind Results: </b><br>"
 			for(var/N in grind_list)
 				body += "<b>-[N]: [grind_list[N]]u</b><br>"
@@ -996,13 +996,13 @@ SUBSYSTEM_DEF(internal_wiki)
 		traits.Add("Spreading")
 	if(S.get_trait(TRAIT_EXPLOSIVE))
 		traits.Add("Explosive")
-	if(!traits.len)
+	if(!length(traits))
 		traits.Add("None")
 	data["traits"] = traits
 	data["mob_product"] = S.has_mob_product

 	data["chem_breakdown"] = null
-	if(S.chems && S.chems.len > 0)
+	if(S.chems && length(S.chems) > 0)
 		var/list/chems = list()
 		for(var/CB in S.chems)
 			var/datum/reagent/CBR = SSchemistry.chemical_reagents[CB]
@@ -1013,21 +1013,21 @@ SUBSYSTEM_DEF(internal_wiki)
 		data["chem_breakdown"] = chems

 	data["gas_consumed"] = null
-	if(S.consume_gasses && S.consume_gasses.len > 0)
+	if(S.consume_gasses && length(S.consume_gasses) > 0)
 		var/list/consumed = list()
 		for(var/CG in S.consume_gasses)
 			consumed["[GLOB.gas_data.name[CG]]"] = S.consume_gasses[CG]
 		data["gas_consumed"] = consumed

 	data["gas_exuded"] = null
-	if(S.exude_gasses && S.exude_gasses.len > 0)
+	if(S.exude_gasses && length(S.exude_gasses) > 0)
 		var/list/exude = list()
 		for(var/EG in S.exude_gasses)
 			exude["[GLOB.gas_data.name[EG]]"] = S.exude_gasses[EG]
 		data["gas_exuded"] = exude

 	data["mutations"] = null
-	if(S.mutants && S.mutants.len > 0)
+	if(S.mutants && length(S.mutants) > 0)
 		var/list/mutations = list()
 		for(var/MS in S.mutants)
 			var/datum/seed/mut = SSplants.seeds[MS]
@@ -1052,13 +1052,13 @@ SUBSYSTEM_DEF(internal_wiki)
 		body += "<b>DANGER - MAY BE MOBILE</b><br>"
 	body  += "<br>"
 	var/list/chem_list = data["chem_breakdown"]
-	if(chem_list && chem_list.len > 0)
+	if(chem_list && length(chem_list) > 0)
 		body  += "<b>Chemical Breakdown: </b><br>"
 		for(var/CB in chem_list)
 			body  += "<b>-[CB]</b><br>"
 		body  += "<br>"
 	var/list/consumed_list = data["gas_consumed"]
-	if(consumed_list && consumed_list.len > 0)
+	if(consumed_list && length(consumed_list) > 0)
 		body  += "<b>Gasses Consumed: </b><br>"
 		for(var/CG in consumed_list)
 			var/amount = "[consumed_list[CG]]"
@@ -1067,7 +1067,7 @@ SUBSYSTEM_DEF(internal_wiki)
 			body  += "<b>-[amount]</b><br>"
 		body  += "<br>"
 	var/list/exuded_list = data["gas_exuded"]
-	if(exuded_list && exuded_list.len > 0)
+	if(exuded_list && length(exuded_list) > 0)
 		body  += "<b>Gasses Produced: </b><br>"
 		for(var/EG in exuded_list)
 			var/amount = "[exuded_list[EG]]"
@@ -1076,7 +1076,7 @@ SUBSYSTEM_DEF(internal_wiki)
 			body  += "<b>-[amount]</b><br>"
 		body  += "<br>"
 	var/list/mutations = data["mutations"]
-	if(mutations && mutations.len > 0)
+	if(mutations && length(mutations) > 0)
 		body += "<b>Mutant Strains: </b><br>"
 		for(var/MS in mutations)
 			body  += "<b>-[MS]</b><br>"
@@ -1097,7 +1097,7 @@ SUBSYSTEM_DEF(internal_wiki)
 		data["req_mat"] = initial(req_mat.name)

 	data["target_items"] = null
-	if(M.items && M.items.len > 0)
+	if(M.items && length(M.items) > 0)
 		var/list/targs = list()
 		for(var/obj/Ir as anything in M.items)
 			targs.Add(initial(Ir.name))
@@ -1109,7 +1109,7 @@ SUBSYSTEM_DEF(internal_wiki)
 	data["required_atmos_temp_max"] = M.required_atmos_temp_max

 	data["inducers"] = null
-	if(M.reagents != null && M.reagents.len > 0)
+	if(M.reagents != null && length(M.reagents) > 0)
 		var/list/inducers = list()
 		for(var/R in M.reagents)
 			var/amnt = M.reagents[R]
@@ -1127,13 +1127,13 @@ SUBSYSTEM_DEF(internal_wiki)
 	if(data["req_mat"] != null)
 		body += "<b>Target Sheet: [data["req_mat"]]</b><br>"
 	var/list/targ_items = data["target_items"]
-	if(targ_items && targ_items.len > 0)
+	if(targ_items && length(targ_items) > 0)
 		for(var/Ir in targ_items)
 			body += "<b>-[Ir]</b><br>"
 	body += "<b>Threshold Energy: [data["required_energy_min"]] - [data["required_energy_max"]]</b><br>"
 	body += "<b>Threshold Temp: [data["required_atmos_temp_min"]]k - [data["required_atmos_temp_max"]]k | ([data["required_atmos_temp_min"] - T0C]C - [data["required_atmos_temp_max"] - T0C]C)</b><br>"
 	var/list/inducers = data["inducers"]
-	if(inducers && inducers.len > 0)
+	if(inducers && length(inducers) > 0)
 		body += "<br>"
 		body += "<b>Inducers: </b><br>"
 		for(var/R in inducers)
@@ -1282,19 +1282,19 @@ SUBSYSTEM_DEF(internal_wiki)
 	var/list/ingred = list()
 	for(var/ing in recipe["Ingredients"])
 		ingred["[ing]"] = recipe["Ingredients"][ing]
-	recipe_data["ingredients"] = ingred.len ? ingred : null
+	recipe_data["ingredients"] = length(ingred) ? ingred : null
 	var/list/fruits = list()
 	for(var/fru in recipe["Fruit"])
 		fruits["[fru]"] = recipe["Fruit"][fru]
-	recipe_data["fruits"] = fruits.len ? fruits : null
+	recipe_data["fruits"] = length(fruits) ? fruits : null
 	var/list/reagents = list()
 	for(var/rea in recipe["Reagents"])
 		reagents["[rea]"] = recipe["Reagents"][rea]
-	recipe_data["reagents"] = reagents.len ? reagents : null
+	recipe_data["reagents"] = length(reagents) ? reagents : null
 	var/list/catalysts = list()
 	for(var/cat in recipe["Catalysts"])
 		catalysts["[cat]"] = recipe["Catalysts"][cat]
-	recipe_data["catalysts"] = catalysts.len ? catalysts : null
+	recipe_data["catalysts"] = length(catalysts) ? catalysts : null
 	data["recipe"] = recipe_data

 /datum/internal_wiki/page/recipe/get_print()
@@ -1313,7 +1313,7 @@ SUBSYSTEM_DEF(internal_wiki)
 		body += "<b>Appliance: </b>[data["recipe"]["appliance"]]<br><br>"
 	// ingredients
 	var/list/ingreds = data["recipe"]["ingredients"]
-	if(ingreds && ingreds.len)
+	if(ingreds && length(ingreds))
 		var/count = 0
 		var/pretty_ing = ""
 		for(var/ing in ingreds)
@@ -1332,7 +1332,7 @@ SUBSYSTEM_DEF(internal_wiki)
 		body += "<b>Coating: </b> [data["recipe"]["coating"]]<br>"
 	// Fruits/Veggis
 	var/list/fruits = data["recipe"]["fruits"]
-	if(fruits && fruits.len) // Can't use lazylen, assoc list
+	if(fruits && length(fruits)) // Can't use lazylen, assoc list
 		var/count = 0
 		var/pretty_fru = ""
 		for(var/fru in fruits)
@@ -1342,7 +1342,7 @@ SUBSYSTEM_DEF(internal_wiki)
 			body += "<b>Components: </b> [pretty_fru]<br>"
 	//For each reagent
 	var/list/reags = data["recipe"]["reagents"]
-	if(reags && reags.len) // Can't use lazylen, assoc list
+	if(reags && length(reags)) // Can't use lazylen, assoc list
 		var/count = 0
 		var/pretty_rea = ""
 		for(var/reg in reags)
@@ -1352,7 +1352,7 @@ SUBSYSTEM_DEF(internal_wiki)
 			body += "<b>Mix in: </b> [pretty_rea]<br>"
 	//For each catalyst
 	var/list/catalis = data["recipe"]["catalysts"]
-	if(catalis && catalis.len) // Can't use lazylen, assoc list
+	if(catalis && length(catalis)) // Can't use lazylen, assoc list
 		var/count = 0
 		var/pretty_cat = ""
 		for(var/cat in catalis)
@@ -1501,7 +1501,7 @@ SUBSYSTEM_DEF(internal_wiki)
 		for(var/path in blockers)
 			var/datum/trait/TG = GLOB.all_traits[path]
 			output_blockers.Add(TG.name)
-		if(output_blockers.len)
+		if(length(output_blockers))
 			data["blockers"] = output_blockers
 	else
 		// Old style gene
@@ -1536,7 +1536,7 @@ SUBSYSTEM_DEF(internal_wiki)
 /datum/internal_wiki/page/proc/print_allergens(var/list/allergens)
 	PROTECTED_PROC(TRUE)
 	var/AG = ""
-	if(allergens && allergens.len > 0)
+	if(allergens && length(allergens) > 0)
 		AG += "<b>Allergens: </b><br>"
 		for(var/ALGY in allergens)
 			AG += "-[ALGY]<br>"
@@ -1546,10 +1546,10 @@ SUBSYSTEM_DEF(internal_wiki)
 /datum/internal_wiki/page/proc/print_reaction_data(var/list/data)
 	var/body = ""
 	var/list/instant = data["instant_reactions"]
-	if(instant && instant.len > 0)
+	if(instant && length(instant) > 0)
 		var/segment = 1
 		for(var/list/react in instant)
-			if(instant.len == 1)
+			if(length(instant) == 1)
 				body += "<b>Potential Chemical breakdown: </b><br>"
 			else
 				body += "<b>Potential Chemical breakdown [segment]: </b><br>"
@@ -1568,10 +1568,10 @@ SUBSYSTEM_DEF(internal_wiki)
 		body += "<b>Potential Chemical breakdown: </b><br>UNKNOWN OR BASE-REAGENT<br>"

 	var/list/distilled = data["distilled_reactions"]
-	if(distilled && distilled.len > 0)
+	if(distilled && length(distilled) > 0)
 		var/segment = 1
 		for(var/list/react in distilled)
-			if(distilled.len == 1)
+			if(length(distilled) == 1)
 				body += "<b>Potential Chemical breakdown: </b><br>"
 			else
 				body += "<b>Potential Chemical breakdown [segment]: </b><br>"
@@ -1589,28 +1589,28 @@ SUBSYSTEM_DEF(internal_wiki)
 				body += " <b>-Catalyst: </b>[CL]<br>"

 	var/list/grind_ore = data["grinding"]["ore"]
-	if(grind_ore && grind_ore.len)
+	if(grind_ore && length(grind_ore))
 		body += "<br>"
 		body += "<b>Ore processing results: </b><br>"
 		for(var/PL in grind_ore)
 			body += " <b>-Grind: </b>[PL]<br>"

 	var/list/grind_mats = data["grinding"]["material"]
-	if(grind_mats && grind_mats.len)
+	if(grind_mats && length(grind_mats))
 		body += "<br>"
 		body += "<b>Material processing results: </b><br>"
 		for(var/PL in grind_mats)
 			body += " <b>-Grind: </b>[PL]<br>"

 	var/list/grind_plants = data["grinding"]["plant"]
-	if(grind_plants && grind_plants.len)
+	if(grind_plants && length(grind_plants))
 		body += "<br>"
 		body += "<b>Organic processing results: </b><br>"
 		for(var/PL in grind_plants)
 			body += " <b>-Grind: </b>[PL]<br>"

 	var/list/fluid_pumping = data["fluid"]
-	if(fluid_pumping && fluid_pumping.len)
+	if(fluid_pumping && length(fluid_pumping))
 		body += "<br>"
 		body += "<b>Fluid pump results: </b><br>"
 		for(var/PL in fluid_pumping)
@@ -1618,7 +1618,7 @@ SUBSYSTEM_DEF(internal_wiki)

 	body += "<br>"
 	var/list/produces = data["produces"]
-	if(produces && produces.len)
+	if(produces && length(produces))
 		body += "<b>Is a component of: </b><br>"
 		for(var/PL in produces)
 			body += "-[PL]<br>"
@@ -14,16 +14,16 @@ SUBSYSTEM_DEF(job)


 /datum/controller/subsystem/job/Initialize()
-	if(!department_datums.len)
+	if(!length(department_datums))
 		setup_departments()
-	if(!occupations.len)
+	if(!length(occupations))
 		setup_occupations()
 	return SS_INIT_SUCCESS

 /datum/controller/subsystem/job/proc/setup_occupations(faction = FACTION_STATION)
 	occupations = list()
 	var/list/all_jobs = subtypesof(/datum/job)
-	if(!all_jobs.len)
+	if(!length(all_jobs))
 		to_chat(world, span_warning("Error setting up jobs, no job datums found"))
 		return FALSE

@@ -80,13 +80,9 @@ SUBSYSTEM_DEF(job)
 	return dept_datums

 /datum/controller/subsystem/job/proc/get_job(rank)
-	if(!occupations.len)
-		setup_occupations()
 	return name_occupations[rank]

 /datum/controller/subsystem/job/proc/get_job_type(jobtype)
-	if(!occupations.len)
-		setup_occupations()
 	return type_occupations[jobtype]

 // Determines if a job title is inside of a specific department.
@@ -164,12 +164,12 @@ SUBSYSTEM_DEF(lighting)
 //Wrapper for the list, because these type of lists are just awful to work with
 //Also takes care of initialization order issues
 /datum/controller/subsystem/lighting/proc/get_pshandler_z(var/z)
-	if(z > z_to_pshandler.len)
+	if(z > length(z_to_pshandler))
 		z_to_pshandler.len = z
 	var/datum/planet_sunlight_handler/pshandler = z_to_pshandler[z]
 	if(istype(pshandler))
 		return pshandler
-	else if(SSplanets && SSplanets.z_to_planet.len >= z && SSplanets.z_to_planet[z])
+	else if(SSplanets && length(SSplanets.z_to_planet) >= z && SSplanets.z_to_planet[z])
 		var/datum/planet/P = SSplanets.z_to_planet[z]
 		if(istype(P))
 			pshandler = get_pshandler_planet(P)
@@ -114,12 +114,12 @@ SUBSYSTEM_DEF(machines)
 	msg += "PN:[round(cost_powernets,1)]|"
 	msg += "PO:[round(cost_power_objects,1)]"
 	msg += "} "
-	msg += "PI:[SSmachines.networks.len]|"
-	msg += "MC:[SSmachines.processing_machines.len]|"
-	msg += "PN:[SSmachines.powernets.len][defering_powernets ? " - !!DEFER!!" : ""]|"
-	msg += "PO:[SSmachines.powerobjs.len]|"
-	msg += "HV:[SSmachines.hibernating_vents.len]|"
-	msg += "MC/MS:[round((cost ? SSmachines.processing_machines.len/cost_machinery : 0),0.1)]"
+	msg += "PI:[length(SSmachines.networks)]|"
+	msg += "MC:[length(SSmachines.processing_machines)]|"
+	msg += "PN:[length(SSmachines.powernets)][defering_powernets ? " - !!DEFER!!" : ""]|"
+	msg += "PO:[length(SSmachines.powerobjs)]|"
+	msg += "HV:[length(SSmachines.hibernating_vents)]|"
+	msg += "MC/MS:[round((cost ? length(SSmachines.processing_machines)/cost_machinery : 0),0.1)]"
 	return ..()

 /datum/controller/subsystem/machines/proc/process_pipenets(resumed = 0)
@@ -128,8 +128,8 @@ SUBSYSTEM_DEF(machines)
 	//cache for sanic speed (lists are references anyways)
 	var/wait = src.wait
 	var/list/current_run = src.current_run
-	while(current_run.len)
-		var/datum/pipe_network/PN = current_run[current_run.len]
+	while(length(current_run))
+		var/datum/pipe_network/PN = current_run[length(current_run)]
 		current_run.len--
 		if(!PN || QDELETED(PN))
 			networks.Remove(PN)
@@ -146,8 +146,8 @@ SUBSYSTEM_DEF(machines)

 	var/wait = src.wait
 	var/list/current_run = src.current_run
-	while(current_run.len)
-		var/obj/machinery/M = current_run[current_run.len]
+	while(length(current_run))
+		var/obj/machinery/M = current_run[length(current_run)]
 		current_run.len--
 		if(!istype(M) || QDELETED(M) || (M.process(wait) == PROCESS_KILL))
 			processing_machines.Remove(M)
@@ -161,8 +161,8 @@ SUBSYSTEM_DEF(machines)

 	var/wait = src.wait
 	var/list/current_run = src.current_run
-	while(current_run.len)
-		var/datum/powernet/PN = current_run[current_run.len]
+	while(length(current_run))
+		var/datum/powernet/PN = current_run[length(current_run)]
 		current_run.len--
 		if(!PN)
 			powernets.Remove(PN)
@@ -180,8 +180,8 @@ SUBSYSTEM_DEF(machines)

 	var/wait = src.wait
 	var/list/current_run = src.current_run
-	while(current_run.len)
-		var/obj/item/I = current_run[current_run.len]
+	while(length(current_run))
+		var/obj/item/I = current_run[length(current_run)]
 		current_run.len--
 		if(!I || (I.pwr_drain(wait) == PROCESS_KILL))
 			powerobjs.Remove(I)
@@ -217,13 +217,13 @@ SUBSYSTEM_DEF(machines)
 	// pick at random
 	var/i = rand(20,40)
 	while(i-- > 0)
-		if(!hibernating_vents.len)
+		if(!length(hibernating_vents))
 			break
 		wake_vent(hibernating_vents[pick(hibernating_vents)])
 	// do first 10 entries
 	i = 10
 	for(var/key in hibernating_vents)
-		if(i <= 0 || !hibernating_vents.len)
+		if(i <= 0 || !length(hibernating_vents))
 			break
 		wake_vent(hibernating_vents[key])
 		i--
@@ -30,7 +30,7 @@ SUBSYSTEM_DEF(mail)

 	// Creates mail for all the mail waiting to arrive, if there's nobody to receive it, it will be a chance of junk mail.
 	for(var/mail_iterator in 1 to mail_waiting)
-		if(!mail_recipients.len && prob(60)) // Oh, no mail for our Employees? Well don't just sent them all the junk.
+		if(!length(mail_recipients) && prob(60)) // Oh, no mail for our Employees? Well don't just sent them all the junk.
 			continue
 		var/obj/item/mail/new_mail
 		if(prob(70))
@@ -38,7 +38,7 @@ SUBSYSTEM_DEF(mail)
 		else
 			new_mail = new /obj/item/mail/envelope(mailcrate)
 		var/mob/living/carbon/human/mail_to
-		if(mail_recipients.len)
+		if(length(mail_recipients))
 			mail_to = pick(mail_recipients)
 			new_mail.initialize_for_recipient(mail_to.mind)
 			mail_recipients -= mail_to
@@ -28,18 +28,18 @@ SUBSYSTEM_DEF(mobs)
 	var/list/death_list = list()

 /datum/controller/subsystem/mobs/stat_entry(msg)
-	msg = "P: [GLOB.mob_list.len] | S: [slept_mobs] | D: [death_list.len]"
+	msg = "P: [length(GLOB.mob_list)] | S: [slept_mobs] | D: [length(death_list)]"
 	return ..()

 /datum/controller/subsystem/mobs/fire(resumed = 0)
 	if (!resumed)
 		src.currentrun = GLOB.mob_list.Copy()
-		process_z.len = GLOB.living_players_by_zlevel.len
+		process_z.len = length(GLOB.living_players_by_zlevel)
 		slept_mobs = 0
-		for(var/level in 1 to process_z.len)
-			process_z[level] = GLOB.living_players_by_zlevel[level].len
+		for(var/level in 1 to length(process_z))
+			process_z[level] = length(GLOB.living_players_by_zlevel[level])
 		// Lets handle all of these while we have time, should always remain extremely small...
-		if(death_list.len) // Don't contact DB if this list is empty
+		if(length(death_list)) // Don't contact DB if this list is empty
 			if(CONFIG_GET(flag/sql_enabled))
 				establish_db_connection()
 				if(!SSdbcore.IsConnected())
@@ -51,8 +51,8 @@ SUBSYSTEM_DEF(mobs)
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun
 	var/times_fired = src.times_fired
-	while(currentrun.len)
-		var/mob/M = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/mob/M = currentrun[length(currentrun)]
 		currentrun.len--

 		if(!M || QDELETED(M))
@@ -75,25 +75,25 @@ SUBSYSTEM_DEF(mobs)
 		log_game(msg)
 		log_world(msg)
 		return
-	msg += "Lists: currentrun: [currentrun.len], mob_list: [GLOB.mob_list.len]\n"
+	msg += "Lists: currentrun: [length(currentrun)], mob_list: [length(GLOB.mob_list)]\n"

-	if(!currentrun.len)
+	if(!length(currentrun))
 		msg += "!!The subsystem just finished the mob_list list, and currentrun is empty (or has never run).\n"
 		msg += "!!The info below is the tail of mob_list instead of currentrun.\n"

-	var/datum/D = currentrun.len ? currentrun[currentrun.len] : GLOB.mob_list[GLOB.mob_list.len]
+	var/datum/D = length(currentrun) ? currentrun[length(currentrun)] : GLOB.mob_list[length(GLOB.mob_list)]
 	msg += "Tail entry: [describeThis(D)] (this is likely the item AFTER the problem item)\n"

 	var/position = GLOB.mob_list.Find(D)
 	if(!position)
 		msg += "Unable to find context of tail entry in mob_list list.\n"
 	else
-		if(position != GLOB.mob_list.len)
+		if(position != length(GLOB.mob_list))
 			var/additional = GLOB.mob_list.Find(D, position+1)
 			if(additional)
 				msg += "WARNING: Tail entry found more than once in mob_list list! Context is for the first found.\n"
-		var/start = clamp(position-2,1,GLOB.mob_list.len)
-		var/end = clamp(position+2,1,GLOB.mob_list.len)
+		var/start = clamp(position-2,1,length(GLOB.mob_list))
+		var/end = clamp(position+2,1,length(GLOB.mob_list))
 		msg += "2 previous elements, then tail, then 2 next elements of mob_list list for context:\n"
 		msg += "---\n"
 		for(var/i in start to end)
@@ -18,20 +18,20 @@ SUBSYSTEM_DEF(motiontracker)
 	if(_listen_lookup)
 		var/list/track_list = _listen_lookup[COMSIG_MOVABLE_MOTIONTRACKER]
 		if(islist(track_list))
-			count = track_list.len
+			count = length(track_list)
 		else
 			count = 1 // listen_lookup optimizes single entries into just returning the only thing
 	if(hide_all)
 		msg = "HIDE AND SEEK"
 	else
-		msg = "L: [count] | Q: [queued_echo_turfs.len] | A: [all_echos_round]/[all_pings_round]"
+		msg = "L: [count] | Q: [length(queued_echo_turfs)] | A: [all_echos_round]/[all_pings_round]"
 	return ..()

 /datum/controller/subsystem/motiontracker/fire(resumed = 0)
 	if(!resumed)
 		src.currentrun = queued_echo_turfs.Copy()
 		expended_echos.Cut()
-	while(currentrun.len)
+	while(length(currentrun))
 		var/key = currentrun[1] // Because using an index into an associative array gets the key at that index... I hate you byond.
 		var/list/data = currentrun[key]
 		var/datum/weakref/AF= data[1]
@@ -27,7 +27,7 @@ SUBSYSTEM_DEF(nightshift)

 /datum/controller/subsystem/nightshift/proc/announce(message)
 	var/announce_z
-	if(using_map.station_levels.len)
+	if(length(using_map.station_levels))
 		announce_z = pick(using_map.station_levels)
 	var/pickedsound
 	if(!high_security_mode)
@@ -8,7 +8,7 @@ SUBSYSTEM_DEF(orbit)
 	var/list/processing = list()

 /datum/controller/subsystem/orbit/stat_entry(msg)
-	msg = "P:[processing.len]"
+	msg = "P:[length(processing)]"
 	return ..()


@@ -19,8 +19,8 @@ SUBSYSTEM_DEF(orbit)
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun

-	while (currentrun.len)
-		var/datum/orbit/O = currentrun[currentrun.len]
+	while (length(currentrun))
+		var/datum/orbit/O = currentrun[length(currentrun)]
 		currentrun.len--
 		if (!O)
 			processing -= O
@@ -149,7 +149,7 @@ SUBSYSTEM_DEF(overlays)

 	var/list/cached_other = other.overlays.Copy()
 	if(cached_other)
-		if(cut_old || !overlays.len)
+		if(cut_old || !length(overlays))
 			overlays = cached_other
 		else
 			overlays |= cached_other
@@ -31,8 +31,8 @@ SUBSYSTEM_DEF(persist)
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun
 	var/list/query_stack = src.query_stack
-	while (currentrun.len)
-		var/mob/M = currentrun[currentrun.len]
+	while (length(currentrun))
+		var/mob/M = currentrun[length(currentrun)]
 		currentrun.len--
 		if (QDELETED(M) || !istype(M) || !M.mind || !M.client || TICKS2DS(M.client.inactivity) > wait)
 			continue
@@ -98,7 +98,7 @@ SUBSYSTEM_DEF(persist)
 		if (MC_TICK_CHECK)
 			return

-	if(query_stack.len)
+	if(length(query_stack))
 		SSdbcore.MassInsert(format_table_name("vr_player_hours"), query_stack, duplicate_key = "ON DUPLICATE KEY UPDATE hours = VALUES(hours), total_hours = VALUES(total_hours)")
 		query_stack.Cut()

@@ -13,7 +13,7 @@ SUBSYSTEM_DEF(ping)
 	var/list/currentrun = list()

 /datum/controller/subsystem/ping/stat_entry(msg)
-	msg = "P:[GLOB.clients.len]"
+	msg = "P:[length(GLOB.clients)]"
 	return ..()

 /datum/controller/subsystem/ping/fire(resumed = FALSE)
@@ -24,8 +24,8 @@ SUBSYSTEM_DEF(ping)
 	// De-reference the list for sanic speeds
 	var/list/currentrun = src.currentrun

-	while (currentrun.len)
-		var/client/client = currentrun[currentrun.len]
+	while (length(currentrun))
+		var/client/client = currentrun[length(currentrun)]
 		currentrun.len--

 		if(!client?.prefs?.read_preference(/datum/preference/toggle/vchat_enable))
@@ -42,7 +42,7 @@ SUBSYSTEM_DEF(planets)
 // USE turf/simulated/proc/make_indoors() and
 //     turf/simulated/proc/make_outdoors()
 /datum/controller/subsystem/planets/proc/addTurf(var/turf/T)
-	if(z_to_planet.len >= T.z && z_to_planet[T.z])
+	if(length(z_to_planet) >= T.z && z_to_planet[T.z])
 		var/datum/planet/P = z_to_planet[T.z]
 		if(!istype(P))
 			return
@@ -53,7 +53,7 @@ SUBSYSTEM_DEF(planets)
 			P.weather_holder.apply_to_turf(T)

 /datum/controller/subsystem/planets/proc/removeTurf(var/turf/T,var/is_edge)
-	if(z_to_planet.len >= T.z)
+	if(length(z_to_planet) >= T.z)
 		var/datum/planet/P = z_to_planet[T.z]
 		if(!P)
 			return
@@ -70,8 +70,8 @@ SUBSYSTEM_DEF(planets)
 		src.currentrun = planets.Copy()

 	var/list/needs_sun_update = src.needs_sun_update
-	while(needs_sun_update.len)
-		var/datum/planet/P = needs_sun_update[needs_sun_update.len]
+	while(length(needs_sun_update))
+		var/datum/planet/P = needs_sun_update[length(needs_sun_update)]
 		needs_sun_update.len--
 		updateSunlight(P)
 		if(MC_TICK_CHECK)
@@ -79,8 +79,8 @@ SUBSYSTEM_DEF(planets)

 	#ifndef UNIT_TESTS // Don't be updating temperatures and such during unit tests
 	var/list/needs_temp_update = src.needs_temp_update
-	while(needs_temp_update.len)
-		var/datum/planet/P = needs_temp_update[needs_temp_update.len]
+	while(length(needs_temp_update))
+		var/datum/planet/P = needs_temp_update[length(needs_temp_update)]
 		needs_temp_update.len--
 		updateTemp(P)
 		if(MC_TICK_CHECK)
@@ -88,8 +88,8 @@ SUBSYSTEM_DEF(planets)
 	#endif

 	var/list/currentrun = src.currentrun
-	while(currentrun.len)
-		var/datum/planet/P = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/datum/planet/P = currentrun[length(currentrun)]
 		currentrun.len--

 		P.process(last_fire)
@@ -25,7 +25,7 @@ SUBSYSTEM_DEF(plants)
 	var/list/currentrun = list()

 /datum/controller/subsystem/plants/stat_entry(msg)
-	msg = "P:[processing.len]|S:[seeds.len]"
+	msg = "P:[length(processing)]|S:[length(seeds)]"
 	return ..()

 /datum/controller/subsystem/plants/Initialize()
@@ -68,7 +68,7 @@ SUBSYSTEM_DEF(plants)
 	for(var/type in subtypesof(/datum/seed))
 		var/datum/seed/S = new type
 		seeds[S.name] = S
-		S.uid = "[seeds.len]"
+		S.uid = "[length(seeds)]"
 		S.roundstart = 1

 	// Make sure any seed packets that were mapped in are updated
@@ -80,7 +80,7 @@ SUBSYSTEM_DEF(plants)
 	var/list/gene_datums = decls_repository.get_decls_of_subtype(/decl/plantgene)
 	var/list/used_masks = list()
 	var/list/plant_traits = ALL_GENES
-	while(plant_traits && plant_traits.len)
+	while(plant_traits && length(plant_traits))
 		var/gene_tag = pick(plant_traits)
 		var/gene_mask = "[uppertext(num2hex(rand(0,255), 2))]"

@@ -131,8 +131,8 @@ SUBSYSTEM_DEF(plants)
 	// Caching
 	var/list/currentrun = src.currentrun

-	while(currentrun.len)
-		var/obj/effect/plant/P = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/obj/effect/plant/P = currentrun[length(currentrun)]
 		--currentrun.len
 		if(!P || QDELETED(P))
 			continue
@@ -10,14 +10,14 @@ SUBSYSTEM_DEF(points_of_interest)
 	var/list/obj/effect/landmark/poi_loader/poi_queue = list()

 /datum/controller/subsystem/points_of_interest/Initialize()
-	while (poi_queue.len)
+	while (length(poi_queue))
 		load_next_poi()
 	log_mapping("Initializing POIs")
 	admin_notice(span_danger("Initializing POIs"), R_DEBUG)
 	return SS_INIT_SUCCESS

 /datum/controller/subsystem/points_of_interest/fire(resumed = FALSE)
-	while (poi_queue.len)
+	while (length(poi_queue))
 		load_next_poi()

 		if (MC_TICK_CHECK)
@@ -37,7 +37,7 @@ SUBSYSTEM_DEF(points_of_interest)
 	//var/deleted_atoms = 0
 	//admin_notice(span_danger("Annihilating objects in poi loading location."), R_DEBUG)
 	var/list/turfs_to_clean = get_turfs_to_clean(poi_to_load)
-	if(turfs_to_clean.len)
+	if(length(turfs_to_clean))
 		for(var/x in 1 to 2) // Requires two passes to get everything.
 			for(var/turf/T in turfs_to_clean)
 				for(var/atom/movable/AM in T)
@@ -57,7 +57,7 @@ SUBSYSTEM_DEF(points_of_interest)
 	if(!poi_to_load.poi_type)
 		return

-	if(!(GLOB.global_used_pois.len) || !(GLOB.global_used_pois[poi_to_load.poi_type]))
+	if(!(length(GLOB.global_used_pois)) || !(GLOB.global_used_pois[poi_to_load.poi_type]))
 		GLOB.global_used_pois[poi_to_load.poi_type] = list()
 		var/list/poi_list = GLOB.global_used_pois[poi_to_load.poi_type]
 		for(var/map in SSmapping.map_templates)
@@ -69,7 +69,7 @@ SUBSYSTEM_DEF(points_of_interest)

 	var/list/our_poi_list = GLOB.global_used_pois[poi_to_load.poi_type]

-	if(!our_poi_list.len)
+	if(!length(our_poi_list))
 		return
 	else
 		template_to_use = pick(our_poi_list)
@@ -12,8 +12,8 @@ PROCESSING_SUBSYSTEM_DEF(obj_tab_items)
 	//cache for sanic speed (lists are references anyways)
 	var/list/current_run = currentrun

-	while(current_run.len)
-		var/datum/thing = current_run[current_run.len]
+	while(length(current_run))
+		var/datum/thing = current_run[length(current_run)]
 		if(QDELETED(thing))
 			processing -= thing
 		else if(thing.process(wait * 0.1) == PROCESS_KILL)
@@ -25,7 +25,7 @@ SUBSYSTEM_DEF(processing)
 			processing |= D

 /datum/controller/subsystem/processing/stat_entry(msg)
-	msg = "[stat_tag]:[processing.len]"
+	msg = "[stat_tag]:[length(processing)]"
 	return ..()

 /datum/controller/subsystem/processing/fire(resumed = 0)
@@ -34,8 +34,8 @@ SUBSYSTEM_DEF(processing)
 	//cache for sanic speed (lists are references anyways)
 	var/list/current_run = currentrun

-	while(current_run.len)
-		current_thing = current_run[current_run.len]
+	while(length(current_run))
+		current_thing = current_run[length(current_run)]
 		current_run.len--
 		if(QDELETED(current_thing))
 			processing -= current_thing
@@ -68,25 +68,25 @@ SUBSYSTEM_DEF(processing)
 		msg += "ERROR: A critical list [currentrun ? "processing" : "currentrun"] is gone!"
 		log_world(msg)
 		return
-	msg += "Lists: current_run: [currentrun.len], processing: [processing.len]\n"
+	msg += "Lists: current_run: [length(currentrun)], processing: [length(processing)]\n"

-	if(!currentrun.len)
+	if(!length(currentrun))
 		msg += "!!The subsystem just finished the processing list, and currentrun is empty (or has never run).\n"
 		msg += "!!The info below is the tail of processing instead of currentrun.\n"

-	var/datum/D = currentrun.len ? currentrun[currentrun.len] : processing[processing.len]
+	var/datum/D = length(currentrun) ? currentrun[length(currentrun)] : processing[length(processing)]
 	msg += "Tail entry: [describeThis(D)] (this is likely the item AFTER the problem item)\n"

 	var/position = processing.Find(D)
 	if(!position)
 		msg += "Unable to find context of tail entry in processing list.\n"
 	else
-		if(position != processing.len)
+		if(position != length(processing))
 			var/additional = processing.Find(D, position+1)
 			if(additional)
 				msg += "WARNING: Tail entry found more than once in processing list! Context is for the first found.\n"
-		var/start = clamp(position-2,1,processing.len)
-		var/end = clamp(position+2,1,processing.len)
+		var/start = clamp(position-2,1,length(processing))
+		var/end = clamp(position+2,1,length(processing))
 		msg += "2 previous elements, then tail, then 2 next elements of processing list for context:\n"
 		msg += "---\n"
 		for(var/i in start to end)
@@ -17,8 +17,8 @@ SUBSYSTEM_DEF(radiation)
 		current_res_cache = resistance_cache.Copy()
 		listeners = GLOB.living_mob_list.Copy()

-	while(current_sources.len)
-		var/datum/radiation_source/S = current_sources[current_sources.len]
+	while(length(current_sources))
+		var/datum/radiation_source/S = current_sources[length(current_sources)]
 		current_sources.len--

 		if(QDELETED(S))
@@ -28,8 +28,8 @@ SUBSYSTEM_DEF(radiation)
 		if (MC_TICK_CHECK)
 			return

-	while(current_res_cache.len)
-		var/turf/T = current_res_cache[current_res_cache.len]
+	while(length(current_res_cache))
+		var/turf/T = current_res_cache[length(current_res_cache)]
 		current_res_cache.len--

 		if(QDELETED(T))
@@ -39,11 +39,11 @@ SUBSYSTEM_DEF(radiation)
 		if (MC_TICK_CHECK)
 			return

-	if(!sources.len)
+	if(!length(sources))
 		listeners.Cut()

-	while(listeners.len)
-		var/atom/A = listeners[listeners.len]
+	while(length(listeners))
+		var/atom/A = listeners[length(listeners)]
 		listeners.len--

 		if(!QDELETED(A))
@@ -55,7 +55,7 @@ SUBSYSTEM_DEF(radiation)
 			return

 /datum/controller/subsystem/radiation/stat_entry(msg)
-	msg = "S:[sources.len], RC:[resistance_cache.len]"
+	msg = "S:[length(sources)], RC:[length(resistance_cache)]"
 	return ..()

 // Ray trace from all active radiation sources to T and return the strongest effect.
@@ -331,7 +331,7 @@ SUBSYSTEM_DEF(research)

 // 	for(var/partner_path in subtypesof(/datum/scientific_partner))
 // 		var/datum/scientific_partner/partner = new partner_path
-// 		if(!partner.accepted_experiments.len)
+// 		if(!length(partner.accepted_experiments))
 // 			for (var/datum/experiment/ordnance/ordnance_experiment as anything in ordnance_experiments)
 // 				partner.accepted_experiments += ordnance_experiment.type
 // 		scientific_partners += partner
@@ -85,13 +85,13 @@ SUBSYSTEM_DEF(robot_sprites)
 	if(!islist(sprite_list))
 		return 0

-	return sprite_list.len
+	return length(sprite_list)

 /datum/controller/subsystem/robot_sprites/proc/get_default_module_sprite(var/module)

 	var/list/module_sprites = get_module_sprites(module)

-	if(!module_sprites || !module_sprites.len)
+	if(!module_sprites || !length(module_sprites))
 		return

 	var/chosen_sprite
@@ -6,8 +6,8 @@ TIMER_SUBSYSTEM_DEF(runechat)

 /datum/controller/subsystem/timer/runechat/fire(resumed)
 	. = ..() //poggers
-	while(message_queue.len)
-		var/datum/callback/queued_message = message_queue[message_queue.len]
+	while(length(message_queue))
+		var/datum/callback/queued_message = message_queue[length(message_queue)]
 		queued_message.Invoke()
 		message_queue.len--
 		if(MC_TICK_CHECK)
@@ -106,7 +106,7 @@ SUBSYSTEM_DEF(server_maint)

 	var/max_pop = CONFIG_GET(number/max_hub_pop)

-	if(GLOB.clients.len > max_pop)
+	if(length(GLOB.clients) > max_pop)
 		world.update_hub_visibility(FALSE)
 	else
 		world.update_hub_visibility(TRUE)
@@ -54,8 +54,8 @@ SUBSYSTEM_DEF(shuttles)
 		src.current_run = process_shuttles.Copy()

 	var/list/working_shuttles = src.current_run // Cache for sanic speed
-	while(working_shuttles.len)
-		var/datum/shuttle/S = working_shuttles[working_shuttles.len]
+	while(length(working_shuttles))
+		var/datum/shuttle/S = working_shuttles[length(working_shuttles)]
 		working_shuttles.len--
 		if(!istype(S) || QDELETED(S))
 			log_world("## ERROR Bad entry in SSshuttles.process_shuttles - [log_info_line(S)] ")
@@ -177,5 +177,5 @@ SUBSYSTEM_DEF(shuttles)
 		overmap_halted ? ship_effect.halt() : ship_effect.unhalt()

 /datum/controller/subsystem/shuttles/stat_entry(msg)
-	msg = "Shuttles:[process_shuttles.len]/[shuttles.len], Ships:[ships.len], L:[registered_shuttle_landmarks.len][overmap_halted ? ", HALT" : ""]"
+	msg = "Shuttles:[length(process_shuttles)]/[length(shuttles)], Ships:[length(ships)], L:[length(registered_shuttle_landmarks)][overmap_halted ? ", HALT" : ""]"
 	return ..()
@@ -25,7 +25,7 @@ SUBSYSTEM_DEF(starmover)
 /datum/controller/subsystem/starmover/fire(resumed)
 	// Get next in queue or dropout
 	if(!resumed && !current_movement)
-		if(!zqueue.len)
+		if(!length(zqueue))
 			return
 		current_movement = zqueue[1]
 		zqueue[1] = null
@@ -34,15 +34,15 @@ SUBSYSTEM_DEF(starmover)
 		var/zlevel = current_movement[CR_ZLEVEL]
 		var/new_dir = current_movement[CR_DIRECTION]
 		var/list/turf_list = current_movement[CR_TURFS]
-		if(!turf_list.len || moving_levels["[zlevel]"] == new_dir)
+		if(!length(turf_list) || moving_levels["[zlevel]"] == new_dir)
 			clear_movement_run()
 			return
 		moving_levels["[zlevel]"] = new_dir
 		currentrun = turf_list

 	// Has a movement queued, process all turfs
-	while(currentrun.len)
-		var/turf/space/T = currentrun[currentrun.len]
+	while(length(currentrun))
+		var/turf/space/T = currentrun[length(currentrun)]
 		currentrun.len--
 		if(istype(T))
 			T.toggle_transit(current_movement[CR_DIRECTION])
@@ -56,7 +56,7 @@ SUBSYSTEM_DEF(starmover)
 	currentrun = null

 /datum/controller/subsystem/starmover/stat_entry(msg)
-	msg = "Q:[zqueue.len] C:[currentrun ? currentrun.len : "-"]"
+	msg = "Q:[length(zqueue)] C:[currentrun ? length(currentrun) : "-"]"
 	return ..()

 /// Used to 'move' stars in spess. null direction stops movement
@@ -114,11 +114,11 @@ SUBSYSTEM_DEF(statpanels)
 /datum/controller/subsystem/statpanels/proc/update_misc_tabs(var/client/target,var/mob/target_mob)
 	target_mob.update_misc_tabs()
 	for(var/tab in target_mob.misc_tabs)
-		if(target_mob.misc_tabs[tab].len == 0 && (tab in target.misc_tabs))
+		if(length(target_mob.misc_tabs[tab]) == 0 && (tab in target.misc_tabs))
 			target.misc_tabs -= tab
 			target.stat_panel.send_message("remove_misc",tab)

-		if(target_mob.misc_tabs[tab].len > 0)
+		if(length(target_mob.misc_tabs[tab]) > 0)
 			if(!(tab in target.misc_tabs))
 				target.misc_tabs += tab
 				target.stat_panel.send_message("create_misc",tab)
@@ -211,7 +211,7 @@ SUBSYSTEM_DEF(statpanels)
 /datum/controller/subsystem/statpanels/proc/generate_mc_data()
 	mc_data = list(
 		list("CPU:", world.cpu),
-		list("Instances:", "[num2text(world.contents.len, 10)]"),
+		list("Instances:", "[num2text(length(world.contents), 10)]"),
 		list("World Time:", "[world.time]"),
 		list("Globals:", GLOB.stat_entry(), text_ref(GLOB)),
 		list("[config]:", config.stat_entry(), text_ref(config)),
@@ -240,7 +240,7 @@ SUBSYSTEM_DEF(statpanels)
 #endif
 	for(var/datum/controller/subsystem/sub_system as anything in Master.subsystems)
 		mc_data[++mc_data.len] = list("\[[sub_system.state_letter()]][sub_system.name]", sub_system.stat_entry(), "\ref[sub_system]")
-	mc_data[++mc_data.len] = list("Camera Net", "Cameras: [global.cameranet.cameras.len] | Chunks: [global.cameranet.chunks.len]", "\ref[global.cameranet]")
+	mc_data[++mc_data.len] = list("Camera Net", "Cameras: [length(global.cameranet.cameras)] | Chunks: [length(global.cameranet.chunks)]", "\ref[global.cameranet]")

 ///immediately update the active statpanel tab of the target client
 /datum/controller/subsystem/statpanels/proc/immediate_send_stat_data(client/target)
@@ -11,8 +11,8 @@ SUBSYSTEM_DEF(sun)
 		sun.calc_position()

 	//now tell the solar control computers to update their status and linked devices
-	while(current_run.len)
-		var/obj/machinery/power/solar_control/SC = current_run[current_run.len]
+	while(length(current_run))
+		var/obj/machinery/power/solar_control/SC = current_run[length(current_run)]
 		current_run.len--
 		if(!SC.powernet)
 			GLOB.solars_list.Remove(SC)
@@ -135,19 +135,20 @@ SUBSYSTEM_DEF(supply)
 		if(SO.status == SUP_ORDER_APPROVED)
 			shoppinglist += SO

-	if(!shoppinglist.len)
+	var/orderedamount = length(shoppinglist)
+
+	if(!orderedamount)
 		return
-	var/orderedamount = shoppinglist.len

 	var/list/clear_turfs = get_clear_turfs()

 	var/shopping_log = "SUPPLY_BUY: "

 	for(var/datum/supply_order/SO in shoppinglist)
-		if(!clear_turfs.len)
+		if(!length(clear_turfs))
 			break

-		var/i = rand(1,clear_turfs.len)
+		var/i = rand(1,length(clear_turfs))
 		var/turf/pickedloc = clear_turfs[i]
 		clear_turfs.Cut(i,i+1)

@@ -191,7 +192,7 @@ SUBSYSTEM_DEF(supply)
 		if(istype(SP,/datum/supply_pack/randomised))
 			var/datum/supply_pack/randomised/SPR = SP
 			contains = list()
-			if(SPR.contains.len)
+			if(length(SPR.contains))
 				for(var/j=1,j<=SPR.num_contained,j++)
 					contains += pick(SPR.contains)
 		else
@@ -66,7 +66,7 @@ SUBSYSTEM_DEF(tgui)
 	close_all_uis()

 /datum/controller/subsystem/tgui/stat_entry(msg)
-	msg = "P:[all_uis.len]"
+	msg = "P:[length(all_uis)]"
 	return ..()

 /datum/controller/subsystem/tgui/fire(resumed = FALSE)
@@ -74,8 +74,8 @@ SUBSYSTEM_DEF(tgui)
 		src.current_run = all_uis.Copy()
 	// Cache for sanic speed (lists are references anyways)
 	var/list/current_run = src.current_run
-	while(current_run.len)
-		var/datum/tgui/ui = current_run[current_run.len]
+	while(length(current_run))
+		var/datum/tgui/ui = current_run[length(current_run)]
 		current_run.len--
 		// TODO: Move user/src_object check to process()
 		if(ui?.user && ui.src_object)
@@ -23,7 +23,7 @@ SUBSYSTEM_DEF(throwing)
 	var/list/currentrun = src.currentrun

 	while(length(currentrun))
-		var/atom/movable/AM = currentrun[currentrun.len]
+		var/atom/movable/AM = currentrun[length(currentrun)]
 		var/datum/thrownthing/TT = currentrun[AM]
 		currentrun.len--
 		if (QDELETED(AM) || QDELETED(TT))
@@ -258,7 +258,7 @@ SUBSYSTEM_DEF(ticker)

 	var/list/adm = get_admin_counts()
 	var/list/allmins = adm["present"]
-	send2adminchat("Server", "Round [GLOB.round_id ? "#[GLOB.round_id]" : ""] has started[allmins.len ? ".":" with no active admins online!"]")
+	send2adminchat("Server", "Round [GLOB.round_id ? "#[GLOB.round_id]" : ""] has started[length(allmins) ? ".":" with no active admins online!"]")

 	setup_done = TRUE
 	// TODO START
@@ -295,7 +295,7 @@ SUBSYSTEM_DEF(ticker)

 	var/list/runnable_modes = config.get_runnable_modes()
 	if((GLOB.master_mode == "random") || (GLOB.master_mode == "secret"))
-		if(!runnable_modes.len)
+		if(!length(runnable_modes))
 			to_chat(world, span_filter_system(span_bold("Unable to choose playable game mode.") + " Reverting to pregame lobby."))
 			return 0
 		if(GLOB.secret_force_mode != "secret")
@@ -326,12 +326,12 @@ SUBSYSTEM_DEF(ticker)

 	if(hide_mode)
 		to_chat(world, span_world(span_notice("The current game mode is - Secret!")))
-		if(runnable_modes.len)
+		if(length(runnable_modes))
 			var/list/tmpmodes = list()
 			for (var/datum/game_mode/M in runnable_modes)
 				tmpmodes+=M.name
 			tmpmodes = sortList(tmpmodes)
-			if(tmpmodes.len)
+			if(length(tmpmodes))
 				to_chat(world, span_filter_system(span_bold("Possibilities:") + " [english_list(tmpmodes, and_text= "; ", comma_text = "; ")]"))
 	else
 		src.mode.announce()
@@ -56,8 +56,8 @@ SUBSYSTEM_DEF(transcore)
 				src.current_run[imp] = db

 	var/list/current_run = src.current_run
-	while(current_run.len)
-		var/obj/item/implant/backup/imp = current_run[current_run.len]
+	while(length(current_run))
+		var/obj/item/implant/backup/imp = current_run[length(current_run)]
 		var/datum/transcore_db/db = current_run[imp]
 		current_run.len--

@@ -93,8 +93,8 @@ SUBSYSTEM_DEF(transcore)
 				src.current_run[mr] = db

 	var/list/current_run = src.current_run
-	while(current_run.len)
-		var/datum/transhuman/mind_record/curr_MR = current_run[current_run.len]
+	while(length(current_run))
+		var/datum/transhuman/mind_record/curr_MR = current_run[length(current_run)]
 		var/datum/transcore_db/db = current_run[curr_MR]
 		current_run.len--

@@ -129,13 +129,13 @@ SUBSYSTEM_DEF(transcore)
 	msg += "BK:[round(cost_backups,1)]"
 	msg += "} "
 	msg += "#:{"
-	msg += "DB:[databases.len]|"
+	msg += "DB:[length(databases)]|"
 	if(!default_db)
 		msg += "DEFAULT DB MISSING"
 	else
-		msg += "DFM:[default_db.backed_up.len]|"
-		msg += "DFB:[default_db.body_scans.len]|"
-		msg += "DFI:[default_db.implants.len]"
+		msg += "DFM:[length(default_db.backed_up)]|"
+		msg += "DFB:[length(default_db.body_scans)]|"
+		msg += "DFI:[length(default_db.implants)]"
 	msg += "} "
 	return ..()

@@ -296,7 +296,7 @@ SUBSYSTEM_DEF(transcore)
 	disk.stored += backed_up
 	backed_up.Cut()
 	core_dumped = TRUE
-	return disk.stored.len
+	return length(disk.stored)

 #undef SSTRANSCORE_BACKUPS
 #undef SSTRANSCORE_IMPLANTS
@@ -15,8 +15,8 @@ SUBSYSTEM_DEF(vis_overlays)
 		currentrun = vis_overlay_cache.Copy()
 	var/list/current_run = currentrun

-	while(current_run.len)
-		var/key = current_run[current_run.len]
+	while(length(current_run))
+		var/key = current_run[length(current_run)]
 		var/obj/effect/overlay/vis/overlay = current_run[key]
 		current_run.len--
 		if(!overlay.unused && !length(overlay.vis_locs))
@@ -79,8 +79,8 @@ SUBSYSTEM_DEF(vote)
 		if(votes > greatest_votes)
 			greatest_votes = votes

-	if(!config.vote_no_default && choices.len) // Default-vote for everyone who didn't vote
-		var/non_voters = (GLOB.clients.len - total_votes)
+	if(!config.vote_no_default && length(choices)) // Default-vote for everyone who didn't vote
+		var/non_voters = (length(GLOB.clients) - total_votes)
 		if(non_voters > 0)
 			if(mode == VOTE_RESTART)
 				choices["Continue Playing"] += non_voters
@@ -117,8 +117,8 @@ SUBSYSTEM_DEF(vote)
 /datum/controller/subsystem/vote/proc/announce_result()
 	var/list/winners = get_result()
 	var/text
-	if(winners.len > 0)
-		if(winners.len > 1)
+	if(length(winners) > 0)
+		if(length(winners) > 1)
 			if(mode != VOTE_GAMEMODE || ticker.hide_mode == 0) // Here we are making sure we don't announce potential game modes
 				text = span_bold("Vote Tied Between:") + "\n"
 				for(var/option in winners)
@@ -184,7 +184,7 @@ SUBSYSTEM_DEF(vote)
 			return
 		if(current_votes[ckey])
 			choices[choices[current_votes[ckey]]]--
-		if(newVote && newVote >= 1 && newVote <= choices.len)
+		if(newVote && newVote >= 1 && newVote <= length(choices))
 			choices[choices[newVote]]++
 			current_votes[ckey] = newVote
 		else
@@ -285,7 +285,7 @@ SUBSYSTEM_DEF(vote)
 		if(mode == VOTE_GAMEMODE)
 			.+= "<td align = 'center'><b>Minimum Players</b></td></tr>"

-		for(var/i = 1 to choices.len)
+		for(var/i = 1 to length(choices))
 			var/votes = choices[choices[i]]
 			if(!votes)
 				votes = 0
@@ -295,7 +295,7 @@ SUBSYSTEM_DEF(vote)
 				. += "<td>[thisVote ? "<b>" : ""]<a href='byond://?src=\ref[src];vote=[i]'>[gamemode_names[choices[i]]]</a>[thisVote ? "</b>" : ""]</td><td align = 'center'>[votes]</td>"
 			else
 				. += "<td>[thisVote ? "<b>" : ""]<a href='byond://?src=\ref[src];vote=[i]'>[choices[i]]</a>[thisVote ? "</b>" : ""]</td><td align = 'center'>[votes]</td>"
-			if (additional_text.len >= i)
+			if (length(additional_text) >= i)
 				. += additional_text[i]
 			. += "</tr>"

@@ -392,5 +392,5 @@ SUBSYSTEM_DEF(vote)
 	set name = "Vote"

 	if(SSvote)
-		src << browse(SSvote.interface(src), "window=vote;size=500x[300 + SSvote.choices.len * 25]")
+		src << browse(SSvote.interface(src), "window=vote;size=500x[300 + length(SSvote.choices) * 25]")
 */