Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = 1;
    var t_false = false, t_undefined = undefined, t_null = null, t_zero = 0, t_nan = NaN, t_empty = '';
  };
</script>

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do {a = 1;} while (t_false)

do {a = 1;} while (t_undefined)

do {a = 1;} while (t_null)

do {a = 1;} while (t_nan)

do {a = 1;} while (t_empty)

do {a = 1;} while (t_zero)

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