From: Yusuke Endoh Date: 2012-02-13T20:16:29+09:00 Subject: [ruby-core:42529] [ruby-trunk - Feature #4890][Assigned] Enumerable#lazy Issue #4890 has been updated by Yusuke Endoh. Status changed from Open to Assigned Assignee changed from Yukihiro Matsumoto to Yutaka HARA Target version changed from 3.0 to 2.0.0 Congrats, this proposal had an affirmative vote from matz! (See #708) To avoid bikeshed discussion, I propose that we tentatively commit an implementation as OP proposed. I know there are still some issues on the API detail. But let's discuss about the remained issues with the actual example. Don't worry, we can change the API until this August. Yutaka, could you make a patch in C? Or anyone? -- Yusuke Endoh ---------------------------------------- Feature #4890: Enumerable#lazy https://bugs.ruby-lang.org/issues/4890 Author: Yutaka HARA Status: Assigned Priority: Normal Assignee: Yutaka HARA Category: core Target version: 2.0.0 =begin = Example Print first 100 primes which are in form of n^2+1 require 'prime' INFINITY = 1.0 / 0 p (1..INFINITY).lazy.map{|n| n**2+1}.select{|m| m.prime?}.take(100) (Example taken from enumerable_lz; thanks @antimon2) = Description Enumerable#lazy returns an instance of Enumerable::Lazy. This is the only method added to the existing bulit-in classes. Lazy is a subclass of Enumerator, which includes Enumerable. So you can call any methods of Enumerable on Lazy, except methods like map, select, etc. are redefined as 'lazy' versions. = Sample implementation (()) (also attached to this ticket) =end -- http://bugs.ruby-lang.org/