From: "jay s." <solomon.jas@...>
Date: 2011-05-27T00:55:46+09:00
Subject: Re: Method that mutates object

/*
 *  call-seq:
 *     str.replace(other_str)   -> str
 *
 *  Replaces the contents and taintedness of <i>str</i> with the
corresponding
 *  values in <i>other_str</i>.
 *
 *     s = "hello"         #=> "hello"
 *     s.replace "world"   #=> "world"
 */

VALUE
rb_str_replace(VALUE str, VALUE str2)
{
    str_modifiable(str);
    if (str == str2) return str;

    StringValue(str2);
    str_discard(str);
    return str_replace(str, str2);
}



So from the looks of it the String#replace method is implemented in C,
and I'm assuming the return value of rb_str_replace is VALUE?

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