grep(pattern) {|item| ... } -> Enumerator::Lazy[permalink][rdoc][edit]-
Enumerable#grep と同じですが、配列ではなくEnumerator::Lazy を返します。
例:
(100..Float::INFINITY).lazy.map(&:to_s).grep(/\A(\d)\1+\z/) # => #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: 100..Infinity>:map>:grep(/\A(\d)\1+\z/)> (100..Float::INFINITY).lazy.map(&:to_s).grep(/\A(\d)\1+\z/).take(10).force # => ["111", "222", "333", "444", "555", "666", "777", "888", "999", "1111"]
[SEE_ALSO] Enumerable#grep, Enumerable#grep_v, Enumerator::Lazy#grep_v