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djuber/counts.rb

Created August 1, 2018 15:43
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array count items
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counts.rb
class Array
# group elements by their identity, and count each distinct item
def counts
group_by(&:itself).map {|k,v| [k, v.count] }
end
end
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djuber commented Oct 19, 2020

this becomes Enumerable#tally in ruby 2.7 and it is implemented more efficiently.

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