From: Robert Klemme <bob.news@...>
Date: 2003-03-13T20:18:23+09:00
Subject: Re: next iteration within a block


"Wojciech Kaczmarek" <schatten@nospam.transilvania.eu.org> schrieb im
Newsbeitrag news:b4p7bt.114.1@schatten.at.transilvania...
> What is the most short/elegant way of ending the current iteration
> within a block? My first thought was that `next' will break the
> iteration and last evaluated expr will be returned to the caller,
but
> surprisingly `nil' is returned this way, so we have (Ruby 1.6.8):
>
> ['bar','quux'].map {'foo'; next; 42}
> => [nil, nil]

What about

['bar','quux'].map {'foo'}

Why do you need the "next"?

> In a real code, when I don't want to make the content of a block a
> multibranched if statement (or something similar), I use something
> like that:

I assume you want to go trough the array, map values and omit some of
them.  You can do

['bar','quux'].map {|e| e == 'bar' ? nil : 'foo'}.compact

or

['bar','quux'].select{|e| e != 'bar' }.map{'foo'}

Regards

    robert