From: Eric Hodel <drbrain@...7.net>
Date: 2005-10-28T13:39:19+09:00
Subject: Re: difference between the each iterator and the collect iterator?


On Oct 27, 2005, at 8:17 PM, vasten@gmail.com wrote:

> Hi:
> I am a newbie as far as Ruby is concerned. I was going through the
> programming ruby book (2nd Edition), but was not able to figure out  
> the
> difference between the 2 statements:
>
> [1, 2, 3, 4].collect{[i] puts i }
> and
> [1, 2, 3, 4].each{|i| puts i }
>
> Can some guru in this group shed some light?

$ ri Enumerable#collect
----------------------------------------------------- Enumerable#collect
      enum.collect {| obj | block }  => array
      enum.map     {| obj | block }  => array
------------------------------------------------------------------------
      Returns a new array with the results of running _block_ once for
      every element in _enum_.

         (1..4).collect {|i| i*i }   #=> [1, 4, 9, 16]
         (1..4).collect { "cat"  }   #=> ["cat", "cat", "cat", "cat"]

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
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