From: shannonskipper@... Date: 2018-08-08T18:37:48+00:00 Subject: [ruby-core:88356] [Ruby trunk Feature#6284] Add composition for procs Issue #6284 has been updated by shan (Shannon Skipper). matz (Yukihiro Matsumoto) wrote: > We need more discussion if we would add combination methods to the `Symbol` class. > > Matz. A little sugar on Symbol does look really nice: https://gist.github.com/havenwood/d305b42f5b542e9de1eaa8e56ba6bdd7#file-compose_procs-rb-L32-L45 ---------------------------------------- Feature #6284: Add composition for procs https://bugs.ruby-lang.org/issues/6284#change-73383 * Author: pabloh (Pablo Herrero) * Status: Open * Priority: Normal * Assignee: nobu (Nobuyoshi Nakada) * Target version: ---------------------------------------- It would be nice to be able to compose procs like functions in functional programming languages: ```ruby to_camel = :capitalize.to_proc add_header = ->val {"Title: " + val} format_as_title = add_header << to_camel << :strip ``` instead of: ```ruby format_as_title = lambda {|val| "Title: " + val.strip.capitalize } ``` It's pretty easy to implement in pure ruby: ```ruby class Proc def << block proc { |*args| self.call( block.to_proc.call(*args) ) } end end ``` ---Files-------------------------------- 0001-proc.c-Implement-Proc-for-Proc-composition.patch (3.65 KB) 0002-proc.c-Implement-Method-for-Method-composition.patch (2.67 KB) 0003-proc.c-Support-any-callable-when-composing-Procs.patch (3.97 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: