i am working on simple js function... 
I am trying to convert the following code from a for-loop to Array#map
providing my code below in the fiddle.. 
bnasically i am trying to learn array map..

<http://jsfiddle.net/newtdms2/>

```
function doubleAll(numbers) {
    var result = [];
    result = numbers.map(function(num) {
        for (var i = 0; i < numbers.length; i++) {
            result.push(numbers[i] * 2)
        }
        return result;
    });
}

module.exports = doubleAll

```