Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var isArray = Array.isArray;
    
    var obj = {
      isArray: isArray,
      f1: function(arr) { return isArray(arr); },
      f2: function(arr) { return this.isArray(arr); }
    }
  };
</script>

Test runner

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obj.f1([1, 2, 3]);
obj.f1('hello');

obj.f2([1, 2, 3]);
obj.f2('hello');

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