14 lines
344 B
CoffeeScript
14 lines
344 B
CoffeeScript
mode = (arr) ->
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# returns an array with the modes of arr, i.e. the
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# elements that appear most often in arr
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counts = {}
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for elem in arr
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counts[elem] ||= 0
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counts[elem] += 1
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max = 0
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for key, cnt of counts
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max = cnt if cnt > max
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(key for key, cnt of counts when cnt == max)
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console.log mode [1, 2, 2, 2, 3, 3, 3, 4, 4]
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