Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
var whatever = {
  key: 'value',
  array: [1, 2, {type: 'object'}]
};
var whatever2 = copy_object(whatever);
var whatever3 = copy_object(whatever2);

console.log(whatever);
console.log(whatever2);
console.log(whatever3);

whatever2.array[2].type = 'cool';
whatever3.array[2].type = 'still works?';

console.log(whatever.array[2].type);
console.log(whatever2.array[2].type);
console.log(whatever3.array[2].type);

function copy_object(original) {
  var new_object = {};
  do_copy(original, new_object);
  return new_object;
}

function copy_array(original) {
  var new_array = [];
  do_copy(original, new_array);
  return new_array;
}

function do_copy(original, new_object) {
  for (var key in original) {
    if (original instanceof Array) key = parseInt(key);
    if (typeof original[key] === 'object') {
      if (original[key] instanceof Array) {
        new_object[key] = copy_array(original[key]);
      } else {
        new_object[key] = copy_object(original[key]);
      }
    } else {
      new_object[key] = original[key];
    }
  }
}
</script>


<script id="jsbin-source-javascript" type="text/javascript">var whatever = {
  key: 'value',
  array: [1, 2, {type: 'object'}]
};
var whatever2 = copy_object(whatever);
var whatever3 = copy_object(whatever2);

console.log(whatever);
console.log(whatever2);
console.log(whatever3);

whatever2.array[2].type = 'cool';
whatever3.array[2].type = 'still works?';

console.log(whatever.array[2].type);
console.log(whatever2.array[2].type);
console.log(whatever3.array[2].type);

function copy_object(original) {
  var new_object = {};
  do_copy(original, new_object);
  return new_object;
}

function copy_array(original) {
  var new_array = [];
  do_copy(original, new_array);
  return new_array;
}

function do_copy(original, new_object) {
  for (var key in original) {
    if (original instanceof Array) key = parseInt(key);
    if (typeof original[key] === 'object') {
      if (original[key] instanceof Array) {
        new_object[key] = copy_array(original[key]);
      } else {
        new_object[key] = copy_object(original[key]);
      }
    } else {
      new_object[key] = original[key];
    }
  }
}</script></body>
</html>