From: "David A. Black" <dblack@...>
Date: 2005-02-01T04:34:59+09:00
Subject: Re: Array::uniq { block } ?

Hi --

On Tue, 1 Feb 2005, Florian Gross wrote:

> Robert Klemme wrote:
>
>> Also (as optimization) you could use "state << item" instead of "state + 
>> [item]" because Array#<< returns self.  This saves you a lot temporary 
>> 1element arrays and avoids creating new arrays all the time (Array#+ 
>> creates a new Array). :-)
>
> I dislike having the block of .inject having side effects. That sort of 
> defeats the purpose IMHO.

I don't think it's a side effect, since it's just injecting something
into the accumulator or "injectee".  This might be exactly what you
want if, for example, you have multiple references to the accumulator:

   x = []
   y = x

   ["a","b","c"].inject(x) {|m,n| m << n.upcase}

   puts y  # ["A", "B", "C"]

Otherwise in a case like this you could just use #map.


David

-- 
David A. Black
dblack@wobblini.net