Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var testString = "abcd";
    var testInsert = "y";
    var test = "";
    var testArray = testString.split("");
  };
</script>

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testString = testString.substr(0, 2) + testInsert + testString.substr(2, 4);

testArray.splice(testInsert, 0, 2);

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