Create an observed array

createObservedArray

/*
 * @function createObservedArray
 * @params function observer A callback function returning the name of the used Array function.
 * @returns Array The observed array
 * @note This is just a simple way to observe an array, do not use in production ;)
 */
function createObservedArray(observer) {
    var array = [],
        methods = ['pop', 'push', 'shift', 'unshift', 'slice', 'splice', 'reduce'];
    for (var i = methods.length; i--;) {
        var fn = methods[i];
        array[fn] = (function (name) {
            return function () {
                var r = Array.prototype[name].apply(array, arguments);
                observer.call(array, name);
                return r;
            }
        }(fn));
    }
    return array;
}