From: shyouhei@... Date: 2020-07-14T01:24:21+00:00 Subject: [ruby-core:99161] [Ruby master Bug#17030] Enumerable#grep{_v} should be optimized for Regexp Issue #17030 has been updated by shyouhei (Shyouhei Urabe). Yes but E#grep's allocating MatchData is by spec. You can observe `$&` etc. by passing a block to it. ```ruby p %w[q w e r].grep(/./) { $~ } ``` So this is at least a breaking change. ---------------------------------------- Bug #17030: Enumerable#grep{_v} should be optimized for Regexp https://bugs.ruby-lang.org/issues/17030#change-86539 * Author: marcandre (Marc-Andre Lafortune) * Status: Open * Priority: Normal * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN ---------------------------------------- Currently: ```ruby array.select { |e| e.match?(REGEXP) } # about 3x faster and 6x more memory efficient than array.grep(REGEXP) ``` This is because `grep` calls `Regexp#===` which creates useless `MatchData` -- https://bugs.ruby-lang.org/ Unsubscribe: