From: Thomas Leitner <t_leitner@...>
Date: 2004-10-06T18:19:55+09:00
Subject: Re: Upcase array

On Wed, 6 Oct 2004 17:41:50 +0900
Fredrik Jagenheim <jagenheim@gmail.com> wrote:

| Given this array:
| foo = %w { FOO BAR baz biz }
| 
| How do I make all the entries uppercase in a short and readable way?
| 
| The (to me) obvious solution won't work:
| foo.map! { |x| x.upcase! }
| as upcase returns nil if it doesn't have anything to upcase...
| 
| //F
| 
| 

Do not use x.upcase! but x.upcase (without the exclamation mark):

irb(main):005:0> foo = %w{ FOO BAR baz biz }
=> ["FOO", "BAR", "baz", "biz"]
irb(main):006:0> foo.map! { |x| x.upcase }
=> ["FOO", "BAR", "BAZ", "BIZ"]

*hth*,
Thomas