From: Dave Thomas <dave@...>
Date: 2003-12-29T10:51:28+09:00
Subject: Re: An addition to Array (or Enumerable)?


On Dec 28, 2003, at 18:15, Gennady wrote:

> Strange, ri 1.8b claims that Array#select([anIndex]*) may be used, 
> however I got this error:

It changed...  :)

The new ri has it right:


dave[ruby/ruby 17:06:31] ri -f bs Array.select
----------------------------------------------------------- Array#select
      array.select {|i| block } -> an_array
------------------------------------------------------------------------
      Invokes the block passing in successive elements from arr,
      returning an array containing those elements for which the block
      returns a true value (equivalent to Enumerable#select).

         a = %w{ a b c d e f }
         a.select(1, 3, 5)               #=> ["b", "d", "f"]
         a.select(1, 3, 5, 7)            #=> ["b", "d", "f", nil]
         a.select(-1, -3, -5, -7)        #=> ["f", "d", "b", nil]
         a.select {|v| v =~ /[aeiou]/}   #=> ["a", "e"]


Cheers

Dave