Javascript Array removeIf(predicate)

'use strict';//w  w w  .j ava2s  . co  m
Array.prototype.removeIf = function (predicate) {
    var output = [];
    var i = this.length;
    while(i-- > 0) {
        if (predicate(this[i])) {
            output = output.concat(this.splice(i, 1));
        }
    }
    return output.reverse();
};