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micho/Array#occurrences

Last active December 17, 2015 20:39
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Count occurrences
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Array#occurrences
class Array
# Takes %(apple apple strawberry orange orange apple) and returns { apple: 3, orange: 2, strawberry: 1 }
def occurrences
r = {}
group_by {|i| i}.each{|k,v| r[k] = v.count}
sorted = {}
r.sort_by {|k,v| -v}.each {|i| sorted[i[0]] = i[1] }
sorted
end
end
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