From: Tomasz Wegrzanowski <tomasz.wegrzanowski@...>
Date: 2006-09-05T10:20:21+09:00
Subject: Re: Kernel.=== in case statements, even though I never calle

On 9/5/06, Jesse Silliman <wierdbro@gmail.com> wrote:
> Oh, I'm quite aware of that. Oh... its calling the objects inherited
> Kernel.===, not calling Kernel::===. Ok, well, in that case, a good
> question would be "Why is it so much slower in simple cases than == is,
> even though for string they do the exact same thing?"

Kernel#=== calls == method, not aliases it. So you have 2 method calls,
and two dynamic dispatches instead of one: Kernel#===, then String#==.

You can test this by alias_method'ing === to == in String class ;-)

Relevant code:
VALUE
rb_equal(VALUE obj1, VALUE obj2)
{
    VALUE result;

    if (obj1 == obj2) return Qtrue;
    result = rb_funcall(obj1, id_eq, 1, obj2);
    if (RTEST(result)) return Qtrue;
    return Qfalse;
}


-- 
Tomasz Wegrzanowski [ http://t-a-w.blogspot.com/ ]