ArrayHelpers.js

// Because I am an idiot and keep on using 'append', instead of 'push'.
Array.prototype.append = function (item) {
    this.push(item);
    return this;
};

// Returns true if the given item is contained in the array.
Array.prototype.contains = function (item) {
    for (var i = 0; i < this.length; i++) {
        if (this[i] == item) return true;
    }
    return false;
};

// Perform the given action on each element of the array.
Array.prototype.each = function (action) {
    for (var i = 0; i < this.length; i++) {
        action(this[i]);
    }
};

// Remove all occurrences of the given item from an array.
Array.prototype.remove = function (item) {
    var i = 0;
    while (i < this.length) {
        if (this[i] == item) {
            this.splice(i, 1);
        } else {
            i++;
        }
    }
    return this;
};