add remove() function to array of javascript

Array.prototype.indexOf = function(e){
    for (var i = 0; i < this.length; i++) {
        if (e==this[i]) {
            return i;
        }
    }

  return -1;
}

Array.prototype.remove = function(elem) {
    var match = -1;
    while ((match = this.indexOf(elem)) > -1) {
        this.splice(match, 1);
    }
};