From: Eric Hodel <drbrain@...7.net>
Date: 2012-02-08T15:38:06+09:00
Subject: [ruby-core:42433] [ruby-trunk - Feature #707] Documentation for Enumerator chaining


Issue #707 has been updated by Eric Hodel.

Priority changed from Low to Normal

I will work on it, thank you.
----------------------------------------
Feature #707: Documentation for Enumerator chaining
https://bugs.ruby-lang.org/issues/707

Author: Brian Candler
Status: Assigned
Priority: Normal
Assignee: Eric Hodel
Category: DOC
Target version: 2.0.0


=begin
 Enumerators now support a horizontal filter/chaining pattern:
 
   generator.filter1 { ... }.filter2 { ... }.filter3 { ... }.consumer
 
 The overall pattern for a filter is:
 
   Enumerator.new do |y|
     source.each do |input|     # filter INPUT
       ...
       y << output              # filter OUTPUT
     end
   end
 
 This is extremely powerful. However it is not obvious to the newcomer that this is even possible. (Confusion may arise where people know Ruby 1.8's Enumerator, which cannot do this)
 
 So I would just like to see this pattern documented with an example, e.g. under ri Enumerator.new
 
 I have attached a possible example. Note that I have written my Fib generator in a style familiar from ruby-1.8, to emphasise that the Enumerator filter doesn't require a specially-written generator.
=end



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