In Ruby why won't `foo = true unless defined?(foo)` make the assignment?

Posted by LeftHem on Stack Overflow See other posts from Stack Overflow or by LeftHem
Published on 2010-02-18T19:39:57Z Indexed on 2010/05/27 13:41 UTC
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> irb(main):001:0> foo = true unless defined?(foo)
=> nil 
irb(main):002:0> unless defined?(fooo) ; fooo = false ; end
=> false 

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