Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a, b = undefined,
        c = null;
  };
</script>

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if (!a) {
  //
}

if (!b) {
  //
}

if (!c) {
  //
}

if (a === undefined) {
  //
}

if (b === undefined) {
  //
}

if (c === null) {
  //
}

if (typeof a === 'undefined') {
  //
}

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