From: Phillip Gawlowski <cmdjackryan@...>
Date: 2008-06-06T02:39:01+09:00
Subject: Re: why cannot i put conditions in when clause

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Junkone wrote:
| irb(main):003:0> case a
| irb(main):004:1> when 0
| irb(main):005:1> puts "0"
| irb(main):006:1> when >0
| irb(main):007:1> puts "greater"
| irb(main):008:1> end
| SyntaxError: compile error
| (irb):6: syntax error, unexpected '>'
| when >0
|       ^
|         from (irb):8
|

That's what if..else..end is there for.

In a case statement you usually check against 'known' and well-defined
states. Also, once a condition is met in a case statement, no other
branches are evaluated. So, if you had 'when < 1' that wouldn't be
evaluated, even id a = 2.

- --
Phillip Gawlowski
Twitter: twitter.com/cynicalryan
Blog: http://justarubyist.blogspot.com

10 years old is a good age to get stuck at.
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