Preparation code

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.3/underscore-min.js">
</script>
<script>
  Benchmark.prototype.setup = function() {
    var strings = ["hello", "goodbye", "the quick brown fox", "blah blah", "etc"];
    var objectList = []
    for (var i = 0; i < 1000; i++) {
      var randomString = strings[_.random(strings.length - 1)];
      objectList.push({
        string: randomString,
        date: new Date()
      });
    }
  };
</script>

Test runner

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var finalString = _.reduce(objectList, function(memo, dataPair) {
  return memo + dataPair.date.toDateString() + dataPair.string;
}, "");

var mappedStrings = _.map(objectList, function(dataPair) {
  return dataPair.date.toDateString() + dataPair.string;
});
var finalString = mappedStrings.join("");

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