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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
function updateObject(obj) {
  // your code here
    obj.foo = 'foo';
    obj.bar = 'bar';
    obj.bizz = 'bizz';
    obj.bang = 'bang';
    return obj;
}


/* From here down, you are not expected to
   understand.... for now :)


   Nothing to see here!

*/

(function testUpdateObject() {
  var oldObj = {
    cats: 'cats',
    dogs: 'dogs',
  };
  var newObj = updateObject(oldObj);
  if (typeof newObj !== 'object') {
    console.error('ERROR: `createMyObject` must return an object');
    return false
  }
  ['foo', 'bar', 'bizz', 'bang'].forEach(function(key) {
    if (!(key in newObj)) {
      console.error('ERROR: `' + key + '` not in object returned by `updateObject`');
      return false;
    }
  });
  ['foo', 'bar', 'bizz', 'bang'].forEach(function(key) {
    if (newObj[key] !== key) {
      console.error('ERROR: `' + key + '` should be "' + key + '" but was ' + newObj[key]);
      return false;
    }
  });
  if (!(newObj.cats === 'cats' && newObj.dogs === 'dogs')) {
    console.error('ERROR: your function doesn\'t preserve existing key/value pairs');
    return false;
  }
  console.log('SUCCESS: `updateObject` works correctly!');

})();
</script>


<script id="jsbin-source-javascript" type="text/javascript">function updateObject(obj) {
  // your code here
    obj.foo = 'foo';
    obj.bar = 'bar';
    obj.bizz = 'bizz';
    obj.bang = 'bang';
    return obj;
}


/* From here down, you are not expected to
   understand.... for now :)


   Nothing to see here!

*/

(function testUpdateObject() {
  var oldObj = {
    cats: 'cats',
    dogs: 'dogs',
  };
  var newObj = updateObject(oldObj);
  if (typeof newObj !== 'object') {
    console.error('ERROR: `createMyObject` must return an object');
    return false
  }
  ['foo', 'bar', 'bizz', 'bang'].forEach(function(key) {
    if (!(key in newObj)) {
      console.error('ERROR: `' + key + '` not in object returned by `updateObject`');
      return false;
    }
  });
  ['foo', 'bar', 'bizz', 'bang'].forEach(function(key) {
    if (newObj[key] !== key) {
      console.error('ERROR: `' + key + '` should be "' + key + '" but was ' + newObj[key]);
      return false;
    }
  });
  if (!(newObj.cats === 'cats' && newObj.dogs === 'dogs')) {
    console.error('ERROR: your function doesn\'t preserve existing key/value pairs');
    return false;
  }
  console.log('SUCCESS: `updateObject` works correctly!');

})();</script></body>
</html>