Method: Rational#<=>

Defined in:
rational.c

#<=>(numeric) ⇒ -1, ...

Returns -1, 0, or +1 depending on whether rational is less than, equal to, or greater than numeric.

nil is returned if the two values are incomparable.

Rational(2, 3) <=> Rational(2, 3)  #=> 0
Rational(5)    <=> 5               #=> 0
Rational(2, 3) <=> Rational(1, 3)  #=> 1
Rational(1, 3) <=> 1               #=> -1
Rational(1, 3) <=> 0.3             #=> 1

Rational(1, 3) <=> "0.3"           #=> nil

Returns:

  • (-1, 0, +1, nil) 


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# File 'rational.c', line 1079

VALUE
rb_rational_cmp(VALUE self, VALUE other)
{
    switch (TYPE(other)) {
      case T_FIXNUM:
      case T_BIGNUM:
        {
            get_dat1(self);

            if (dat->den == LONG2FIX(1))
                return rb_int_cmp(dat->num, other); /* c14n */
            other = f_rational_new_bang1(CLASS_OF(self), other);
            /* FALLTHROUGH */
        }

      case T_RATIONAL:
        {
            VALUE num1, num2;

            get_dat2(self, other);

            if (FIXNUM_P(adat->num) && FIXNUM_P(adat->den) &&
                FIXNUM_P(bdat->num) && FIXNUM_P(bdat->den)) {
                num1 = f_imul(FIX2LONG(adat->num), FIX2LONG(bdat->den));
                num2 = f_imul(FIX2LONG(bdat->num), FIX2LONG(adat->den));
            }
            else {
                num1 = rb_int_mul(adat->num, bdat->den);
                num2 = rb_int_mul(bdat->num, adat->den);
            }
            return rb_int_cmp(rb_int_minus(num1, num2), ZERO);
        }

      case T_FLOAT:
        return rb_dbl_cmp(nurat_to_double(self), RFLOAT_VALUE(other));

      default:
        return rb_num_coerce_cmp(self, other, idCmp);
    }
}