abs()
Returns the absolute value of num.
12.abs #=> 12 (-34.56).abs #=> 34.56 -34.56.abs #=> 34.56
static VALUE num_abs(VALUE num) { if (RTEST(rb_funcall(num, '<', 1, INT2FIX(0)))) { return rb_funcall(num, rb_intern("-@"), 0); } return num; }