Ruby 如何计算数组中相同的元素.
mehdi-farsi
·
2020年09月07日
·
993 次阅读
a = %w[one two two three three three]
# Ruby 2.4+
a.group_by(&:itself).transform_values(&:count) # => {"one" => 1, "two" => 2, "three" => 3}
# Ruby 2.7+
a.tally # => {"one" => 1, "two" => 2, "three" => 3}
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