method

include?

v1_8_7_330 - Show latest stable - 0 notes - Class: Range

include?(p1) public

Returns true if obj is an element of rng, false otherwise. Conveniently,

is the comparison operator used by

case statements.

case 79
when 1..50   then   print "low\n"
when 51..75  then   print "medium\n"
when 76..100 then   print "high\n"
end

produces:

high

Show source

/*
 *  call-seq:
 *     rng === obj       =>  true or false
 *     rng.member?(val)  =>  true or false
 *     rng.include?(val) =>  true or false
 *  
 *  Returns <code>true</code> if <i>obj</i> is an element of
 *  <i>rng</i>, <code>false</code> otherwise. Conveniently,
 *  <code>===</code> is the comparison operator used by
 *  <code>case</code> statements.
 *     
 *     case 79
 *     when 1..50   then   print "low\n"
 *     when 51..75  then   print "medium\n"
 *     when 76..100 then   print "high\n"
 *     end
 *     
 *  <em>produces:</em>
 *     
 *     high
 */

static VALUE
range_include(range, val)
    VALUE range, val;
{
    VALUE beg, end;

    beg = rb_ivar_get(range, id_beg);
    end = rb_ivar_get(range, id_end);
    if (r_le(beg, val)) {
        if (EXCL(range)) {
            if (r_lt(val, end)) return Qtrue;
        }
        else {
            if (r_le(val, end)) return Qtrue;
        }
    }
    return Qfalse;
}

include?

Related methods

is the comparison operator used by