deep extend

Preparation code

<script src="https://raw.github.com/bestiejs/lodash/v1.0.1/dist/lodash.js">
 
<script>
  Benchmark.prototype.setup = function() {
    o = {
    string:'a',
    int: 1,
    array: [1,2,3],
    oarray: [{'one':1, 'two':'two'}, {'_one':1, '_two':'_two'}]
    }
    e = {
    string: 'b',
    string2: 'a',
    array: [1,2]
    }
    
  };
</script>

Preparation code output