ArrayRemove.js

// Array remove by shifting elements
Array.prototype.remove = function(index) {
    var stop = this.length - 1;
    while (index < stop) this[index] = this[++index];
    this.pop();
}

// Array filter remove by shifting elements
Array.prototype.filterRemove = function(fn) {
    for (var i = 0, j = 0; i < this.length; ++i) {
        if (fn(this[i])) { this[j] = this[i]; ++j; }
    }
    while (j < this.length) this.pop();
}