From: Arlen Cuss <celtic@...>
Date: 2008-02-22T08:05:38+09:00
Subject: Re: Where does instance_eval _magically_ set the variable to?

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Hi all,

The reason is it's a local variable inside a block. Have a look at this, for
example:

>> 1.upto(5) {|i| j = i ** 2; puts j}
1
4
9
16
25
=> 1
>> j
NameError: undefined local variable or method `j' for main:Object
        from (irb):2
>>

j is undefined after the block's execution. If we let j be defined before
the block, however, ...

>> j = "anything at all, really"
=> "anything at all, really"
>> 1.upto(5) {|i| j = i ** 2; puts j}
1
4
9
16
25
=> 1
>> j
=> 25

Since j is already defined, Ruby uses that instead. Confusing, but could be
useful.

Arlen

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