Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var foo = [1, 10, 7, 4, 8, 9, 2, 300, 400, 500, 600, 700, 800],
        bar = [6, 1, 0, 100, 400, 900, 600];
    
    function test_indexOf(a, b) {
      var i, len, c = [];
      for (i = 0, len = a.length; i < len; i++) {
        if (b.indexOf(a[i]) !== -1) {
          c.push(a[i]);
        }
      }
      return c;
    }
    
    function test_forFor(a, b) {
      var i, j, ilen, jlen, c = [];
      for (i = 0, ilen = a.length; i < ilen; i++) {
        for (j = 0, jlen = b.length; j < jlen; j++) {
          if (a[i] === b[j]) {
            c.push(a[i]);
            break;
          }
        }
      }
      return c;
    }
  };
</script>

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test_indexOf(foo, bar);

test_forFor(foo, bar);

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