From: Martin DeMello <martindemello@...>
Date: 2004-07-14T02:52:22+09:00
Subject: Re: Ruby quickies and useful idioms

Paul Brannan <pbrannan@atdesk.com> wrote:
> On Tue, Jul 13, 2004 at 03:11:41PM +0900, Ian Macdonald wrote:
> > irb(main):001:0* foo = %w[ a b c ]
> > => ["a", "b", "c"]
> > irb(main):002:0> bar = %w[ d e f ]
> > => ["d", "e", "f"]
> > irb(main):003:0> baz = Hash[ *( foo.zip( bar ).flatten ) ]
> > => {"a"=>"d", "b"=>"e", "c"=>"f"}
> 
> Trying to be too succinct can get you into trouble:
> 
> irb(main):001:0> a = [1, 2, 3]
> => [1, 2, 3]
> irb(main):002:0> b = [[1], [2, 3], [4, 5]]
> => [[1], [2, 3], 3]
> irb(main):003:0> Hash[ *( a.zip( b ).flatten ) ]
> => {1=>1, 2=>2, 3=>3, 4=>5}

A flatten_once would really be a useful method to have around.

martin