Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var len = 1000;
    var string = "";
    
    var array1= new Array(len);
    for (var i = 0; i < len; i++) {
    array1[i] = new Array(len);
    }
    
    var array2 = new Array(len * len);
  };
</script>

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for (var x = 0; x < len; x++) {
for (var y = 0; y < len; y++) {
array1[x][y] = "lalalal";
}
}

for (var x = 0; x < len; x++) {
for (var y = 0; y < len; y++) {
string = array1[x][y];
}
}
 

for (var x = 0; x < len; x++) {
for (var y = 0; y < len; y++) {
array1[x + "-" + y] = "lalalal";
}
}

for (var x = 0; x < len; x++) {
for (var y = 0; y < len; y++) {
string = array1[x + "-" + y];
}
}

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