From: Marnen Laibow-Koser <marnen@...>
Date: 2009-11-20T03:29:14+09:00
Subject: Re: Ternary Operator and Arrays

Felix Dominguez wrote:
> Given:
> ary = Array.new
> some_hash = {'a' => 1, 'b' => 2, 'c' => 3}
> another_array = ['a', 'c']
> 
> Then:
> another_array.each do |x|
>    ary <<  some_hash.has_key?(key) ? ' ' : some_hash[key]
> end
> 
> Expected:
> ary should be [1, ' ', 3]
> 
> Actual:
> [true, false, true]
> 
> Question:
> Why does that happen?
> 
> -Felix

It's probably a precedence issue.  Looks like << is binding tighter than 
?: .

Anyway, you can just do ary = another_array.collect{|x| some_hash[x] || 
' '}


Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen@marnen.org
-- 
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