From: "François Montel" <zerohalo@...>
Date: 2007-04-05T04:25:23+09:00
Subject: nil? and non-existent objects

Why is it that the nil? method can sometimes be called on an object that
doesn't exist, and other times will return an error. Under what
circumstances can you call the nil? method on a non-existent object?

Consider:

>> puts x = 1 if x.nil?
=> 1
>> puts ‘z is not defined’ if z.nil?
=> NameError: undefined local variable or method ‘z’

Someone mentioned that = has higher precedence than if, so it could be
that in the first statement x is assigned 1 before the conditional
statement is run. However, x.nil? would then always return false.

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