From: Brian Candler <b.candler@...>
Date: 2010-09-17T22:26:32+09:00
Subject: Re: Use of ? in variable names

Todd Benson wrote:
> I suppose because any object is true

nil and false are objects too.

You can probably argue that flag variables could be called 'foo?', but 
it's more difficult to argue for a variable called 'bar!', which you'd 
need for consistency.

I can think of one minor advantage of not allowing local variables to 
end with ? or ! - Ruby unambigously knows that the token is a method, 
which improves the error message.

>> a = 123
=> 123
>> a?
NoMethodError: undefined method `a?' for main:Object
  from (irb):3
  from :0

>> b
NameError: undefined local variable or method `b' for main:Object
  from (irb):2
  from :0
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