Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = 0,
        b = 1,
        c = 0,
        d = -1;
    var arr = [0, 1, 0, -1];
    
    function switchGetVal(i) {
      switch (i) {
      case 0:
        return a;
      case 1:
        return b;
      case 2:
        return c;
      case 3:
        return d;
      default:
        return null;
      }
    }
    
    function arrayGetVal(i) {
      return arr[i];
    }
  };
</script>

Test runner

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var acc;
for (var i = 0; i < 1000; i++)
acc += switchGetVal(i & 3);

var acc;
for (var i = 0; i < 1000; i++)
acc += arrayGetVal(i & 3);

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