/** Definining a counter as a series of key -> numeric value entries
 *
 * All these procs modify in place.
 */

/proc/counterlist_scale(list/L, scalar)
	var/list/out = list()
	for(var/key in L)
		out[key] = L[key] * scalar
	. = out

/proc/counterlist_sum(list/L)
	. = 0
	for(var/key in L)
		. += L[key]

/proc/counterlist_normalise(list/L)
	var/avg = counterlist_sum(L)
	if(avg != 0)
		. = counterlist_scale(L, 1 / avg)
	else
		. = L

/proc/counterlist_combine(list/L1, list/L2)
	for(var/key in L2)
		var/other_value = L2[key]
		if(key in L1)
			L1[key] += other_value
		else
			L1[key] = other_value