Number.sign() in javascript

Question

Wonder if there are any nontrivial ways of finding number\'s sign (signum function)?
May be shorter / faster / more elegant solutions than the obvious one

Answer 1

Math.sign is not supported on IE 11. I am combining the best answer with Math.sign answer :

Math.sign = Math.sign || function(number){
    var sign = number ? ( (number <0) ? -1 : 1) : 0;
    return sign;
};

Now, one can use Math.sign directly.