Array prototypes

gistfile1.js

/*
 * Foreach
 * Example:
 *    var arr = [1,2,3,4];
 *    arr.foreach(function(i,item) {
 *       console.log(i, item);
 *    });
 *
 */
Array.prototype.foreach = function(action) {
    for (var i = 0; i < this.length; i++) {
        action(i, this[i]);           
    }
};

/*
 * Sum (uses 'foreach' prototype)
 * Example:
 *    var arr = [1,2,3,4];
 *    console.log(arr.sum());
 *
 */
Array.prototype.sum = function() {
    var t = 0;
    this.foreach(function(i,item) {
        t += parseInt(item,10);
    });
    return t;
};