Class: Enumerator::Lazy (Ruby 2.0.0)

Creates a new Lazy enumerator. When the enumerator is actually enumerated (e.g. by calling force), obj will be enumerated and each value passed to the given block. The block can yield values back using yielder. For example, to create a method filter_map in both lazy and non-lazy fashions: module Enumerable def filter_map(&block) map(&block).compact end end class Enumerator::Lazy def filter_map Laz

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Ruby2.0のEnumerator::Lazy, ますます関数型言語に近付いてきた