From: Sarah Allen <sarah@...>
Date: 2010-04-15T05:30:33+09:00
Subject: Re: I thought spaces didn't matter around operators


Sarah Allen wrote:
> But, I still can't fully answer my original question
> 
>>> 1 + 1
> is the same as
>>> 1.send(:+, 1)
> 
>>> 1 +1
> is the same as...?
>>> 1 1.send(:+@)
> SyntaxError: compile error
> (irb):8: syntax error, unexpected tINTEGER, expecting $end
> 1 1.send(:+@)
>    ^
>   from (irb):8
> 
> nope.

I still don't quite get the answer to the above question, but the rest 
of my post was incorrect.

>>> t = Time.now
> => Wed Apr 14 12:46:30 -0700 2010
>>> 1 +t
> TypeError: Time can't be coerced into Fixnum
>   from (irb):19:in `+'
>   from (irb):19

This fails because 1 + Time.now doesn't work either. Fixnum's + method 
requires a Fixnum parameter.

Someone on suggested that the unary operator is only used if there isn't 
an object that precedes the operator.  However, if that were true, 
Time.now -t would work.  A special case for String and Fixnum?

>> "foo" +"bar"
=> "foobar"
>> 1 +1
=> 2
>> 1 -1
=> 0
>> Time.now - Time.now
=> 0.0
>> Time.now -Time.now
NoMethodError: undefined method `-@' for Wed Apr 14 13:28:15 -0700 
2010:Time
  from (irb):40

Still curious,
Sarah
-- 
Posted via http://www.ruby-forum.com/.