Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
  var hash = {
   key1: 'value1',
   key2: 'value2',
   key3: 'value3'
  };
  var array = [
   {
   key: 'key1',
   value: 'value1'},
  {
   key: 'key2',
   value: 'value2'},
  {
   key: 'key3',
   value: 'value3'}];
</script>

Preparation code output

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for (key in hash) {
 var a1 = key;
 var a2 = hash[key];
}

$.each(hash, function(key, value) {
 var a1 = key;
 var a2 = value;
});

for (var i = 0; i < array.length; i++) {
 var a1 = array[i].key;
 var a2 = array[i].value;
}

$.each(array, function(index, item) {
 var a1 = item.key;
 var a2 = item.value;
});

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