Array with steroids.

tunedArray.js

"use strict"

var myArray = (function(Array) { // Array with steroids.//{{{
    // Implement an Array clone with extended functions.
    // In only imlements a simple .contains() method, but can be extended to
    // add many more.
    // The main key feature is the ability to do this WITHOUT
    // altering the original Array object in any way.
    // NOTE: Now we should use the myArray object to declare it. Main goal
    // is to implement it as "var Array = (function(arr){...})(Array);"
    // This way we will achieve a "local" context-related Array replacement
    // without affecting any other part (specially third party librarys) of our
    // project.
    //
    // ...but I did'nt got it for now...
    function searchInArray(){ // .contains() implementation.//{{{
         for(var j in this){
              if(this[j]==arguments[0]){
                    return true;
              }
         }
         return false;
    };//}}}
     var myArr = function() { // Our Array replacement.//{{{
        var arr = Array.apply(this, arguments);
        Object.defineProperty (
            arr,
            "contains",
            {
                value: searchInArray,
                writable: true,
                configurable: true,
                enumerable: false
            }
        );
        return arr;
    };//}}}
    myArr.prototype = Array.prototype; // Preserve original Array .prototype
    return myArr;
})(Array);//}}}


// Some testing...
console.log ("new myArray('a', 'b').contains('y'));");
var b = new myArray('a', 'b').contains('y');
console.log ('Type:', typeof b);
console.log ('Value:', b);

var x = new myArray(1, 2, 3);

console.log ("-------------------------");
console.log ('Contents:', x);
console.log ('Length:', x.length);
console.log ('typeof x.contains:', typeof x.contains);
console.log ('x.contains(2):', x.contains(2));
console.log ("-------------------------");

console.log ('Enumerable propertys (array walking):');
for (var i in x) { console.log (i, x[i]);};