Is there an easy way to make nested array flat?

Question

That is to make this:

[ [\'dog\',\'cat\', [\'chicken\', \'bear\'] ],[\'mouse\',\'horse\'] ]

into:

[\'dog\',\'cat\',\'chicken\',\'

Answer 1

Small fix for ChewOnThis_Trident solution and it works perfect:

Array.prototype.flatten = function() {
    return this.reduce(function(a, b) {
        return a.concat(b);
    }, []);
};