Vampire Numbers(codewars)

by Alexey Zakharov

JavaScript

var vampire_test = function(a, b){
	var str = a + '' + b;
	var multi = a * b + '';
		for (var i = 0; i < str.length; i++) {
      if(~multi.lastIndexOf(str[i])) {
      	multi = multi.replace(str[i], '');
      } else {
	      return false;
      }

    }
	return true;
}


console.log(vampire_test(21,6));
console.log(vampire_test(204,615));
console.log(vampire_test(30,-51));
console.log(vampire_test(-246,-510));
console.log(vampire_test(2947050,8469153));
console.log(vampire_test(2947051,8469153));