Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = {},
        b = [],
        toString = Object.prototype.toString,
    objProto = Object.prototype;
  };
</script>

Test runner

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toString.call([]) === "[object Array]"

toString.call({}) === "[object Object]"

Array.isArray([]) === true

({}).__proto__ === objProto;

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