Preparation code

<script src="https://raw.github.com/documentcloud/underscore/master/underscore.js"></script>
<script>
  Benchmark.prototype.setup = function() {
    var item = {id: 1, name: 'hello', anotherField: 123};
  };
</script>

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var newItem = _.clone(item);

var newItem = _.pluck(item, 'id', 'name')

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