From: Sarah Allen <sarah@...>
Date: 2010-04-15T04:47:29+09:00
Subject: Re: I thought spaces didn't matter around operators

Brian Candler wrote:
> -@ is the unary minus method, +@ is the unary plus method.
> 
> class Foo
>   def -@
>     "Minused"
>   end
>   def +@
>     "Plussed"
>   end
> end

This is a very helpful example.

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.

So, in what way is 1 +2 not like 1 +t (where t is a Time object). I know 
2 is a FixNum, but why is that significant?  Specifically, how is the 
expression evaluated to make 1 +1 work?

>> t = 2
=> 2
>> 1 +t
=> 3
>> 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


Thanks!
Sarah
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