Recently, I’ve had quite a popular problem to solve: count the occurences of the given item in a collection. There are few ways to solve this problem - starting from using Enumerable#inject or Enumerable#each_with_object with an empty hash as an accumulator value and writing a code looking like this:

rb collection.each_with_object({}) { |item, accum| accum[item] = accum[item].to_i + 1 } through a bit smarter way and taking advantage of the default hash value:

rb collection.each_with_object(Hash.new(0)) { |item, accum| accum[item] = accum[item] + 1 } All these solutions look quite nice; however, there is one that looks particularly beautiful.

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