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Create a histogram map from a list
Given the list 
groovy
groovy
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[a,b,a,c,b,b], produce a map {a:2, b:3, c:1} which contains the count of each unique item in the list
histogram = [:]
list.each { item ->
if (!histogram.containsKey(item)) histogram[item] = 0
histogram[item]++
}
list.each { item ->
if (!histogram.containsKey(item)) histogram[item] = 0
histogram[item]++
}
histogram = [:]
list.each { histogram[it] = (histogram[it] ?: 0) + 1 }
list.each { histogram[it] = (histogram[it] ?: 0) + 1 }
Submit a new solution for groovy
There are 37 other solutions in additional languages (clojure, cpp, csharp, erlang ...)
