recursiveMap.js

//
// @pram a Array
//

var a = [1,2,3,[4,5,6,[7,8,9]]];

function recursiveMulti(a){
    return a.map(function(i){
        if(Object.prototype.toString.call(i) === "[object Array]")
            return recursiveMulti(i);
        return i * 2;
    });
}

// Recursively use map on multi dimensional array
// hence recursive map (I know, you already know)
// just kidding :P
function walkRecursive(array, cb){
    return array.map(function(value, index, arr){
        if(Object.prototype.toString.call(value) === "[object Array]")
            return walkRecursive(value, cb);
        return cb(value, index, arr);
    });
}