From: "Martin Dürst" <duerst@...>
Date: 2011-12-08T10:01:09+09:00
Subject: [ruby-core:41535] [ruby-trunk - Feature #5710][Closed] Enumerable#each( :method ) and Enumerable#map( :method )


Issue #5710 has been updated by Martin D��rst.

Status changed from Open to Closed

closed at request of submitter
----------------------------------------
Feature #5710: Enumerable#each( :method ) and Enumerable#map( :method )
http://redmine.ruby-lang.org/issues/5710

Author: Mat��as Battocchia
Status: Closed
Priority: Normal
Assignee: 
Category: core
Target version: 


#each and #map could accept an argument of class string or symbol and send it to the objects in the enumerable.

An example:

  array = [ "bi", "tri", "quad" ]
  p array.each( :upcase! ) #=> [ "BI", "TRI", "QUAD" ]
  p array.map( :length ) #=> [ 2, 3, 4 ]

It is the same --but succinctly-- as:

  array.each { | string |
    string.upcase!
  }

  array.map { | string |
    string.length
  }

This abbreviation is useful for those simple cases when you need to call a method over, or retrieve the values of a property of a set of objects.


-- 
http://redmine.ruby-lang.org