Replaces some dumb usage of switch with simpler statements (#48138)

code/game/objects/structures/fence.dm

@@ -128,25 +128,14 @@
 	return TRUE
 
 /obj/structure/fence/door/proc/toggle(mob/user)
-	switch(open)
-		if(FALSE)
-			visible_message("<span class='notice'>\The [user] opens \the [src].</span>")
-			open = TRUE
-		if(TRUE)
-			visible_message("<span class='notice'>\The [user] closes \the [src].</span>")
-			open = FALSE
-
+	open = !open
+	visible_message("<span class='notice'>\The [user] [open ? "opens" : "closes"] \the [src].</span>")
 	update_door_status()
 	playsound(src, 'sound/machines/click.ogg', 100, TRUE)
 
 /obj/structure/fence/door/proc/update_door_status()
-	switch(open)
-		if(FALSE)
-			density = TRUE
-			icon_state = "door_closed"
-		if(TRUE)
-			density = FALSE
-			icon_state = "door_opened"
+	density = !density
+	icon_state = density ? "door_closed" : "door_opened"
 
 /obj/structure/fence/door/proc/can_open(mob/user)
 	return TRUE

code/modules/projectiles/gun.dm

@@ -221,7 +221,7 @@
 	if(check_botched(user))
 		return
 
-	var/obj/item/bodypart/other_hand = user.has_hand_for_held_index(user.get_inactive_hand_index()) //returns non-disabled inactive hands 
+	var/obj/item/bodypart/other_hand = user.has_hand_for_held_index(user.get_inactive_hand_index()) //returns non-disabled inactive hands
 	if(weapon_weight == WEAPON_HEAVY && (user.get_inactive_held_item() || !other_hand))
 		to_chat(user, "<span class='warning'>You need two hands to fire \the [src]!</span>")
 		return
@@ -593,13 +593,10 @@
 	if(!user || !user.client)
 		return
 
-	switch(forced_zoom)
-		if(FALSE)
-			zoomed = FALSE
-		if(TRUE)
-			zoomed = TRUE
-		else
-			zoomed = !zoomed
+	if(isnull(forced_zoom))
+		zoomed = !zoomed
+	else
+		zoomed = forced_zoom
 
 	if(zoomed)
 		var/_x = 0