From: "Mauricio Fernández" <batsman.geo@...>
Date: 2002-12-03T23:47:35+09:00
Subject: Re: Conditional block operations

On Tue, Dec 03, 2002 at 10:58:15PM +0900, Roman Rytov wrote:
> Is there a way to filter results of EACH or COLLECT functions? Let's say
> in
> 
> file.each do |line|
>   a, b = line.split(pattern)
> End
> 
> I wanna work it just over not empty lines or lines fitting some pattern.

file.readlines.select{ |x| x =~ pattern }.each{ |line| a,b = line.split(pattern) }
 
> 
> 
> Anotehr question is about COLLECT;
> 
> myarray.collect {|x| x + ", "}
> 
> I wanna execute only over specific emelents (let's say only odd ones or
> all but last).

myarray.select{ |x| x % 2 == 1 }.collect{ |x| x + ", " }  #.join here ?


myarray[0..-1].collect{ |x| x + ", " }  	# .join    ??

> I know how to do both of them in a couple of lines but RUBY impresses my
> by its brevity. Will it do it in this case too?
> 
> 
> Roman Rytov

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