From: Sebastian Hungerecker <sepp2k@...>
Date: 2007-12-07T00:01:37+09:00
Subject: Re: Capturing STDOUT from a system call (POSIX) into an array

Venks wrote:
> I also understand that map and collect! are the same.

map and collect are the same. As are map! and collect!.
map/collect and map!/collect! however are NOT the same.
Consider this:

arr = [1,2,3]
p arr.map {|x| x+1}  # Prints [2, 3, 4]
p arr                # Prints [1, 2, 3]

arr = [1,2,3]
p arr.map! {|x| x+1} # Prints [2, 3, 4]
p a                  # Prints [2, 3, 4] too.


HTH,
Sebastian
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