Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var ar = [true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, "a"] ;
    
    var obj = {
        "b" : true ,
        "c" : true ,
        "d" : true ,
        "e" : true ,
        "f" : true ,
        "g" : true ,
        "h" : true ,
        "i" : true ,
        "j" : true ,
        "k" : true ,
        "l" : true ,
        "m" : true ,
        "n" : true ,
        "o" : true ,
        "p" : true ,
        "q" : true ,
        "r" : true ,
        "s" : true ,
        "t" : true ,
        "a" : true
    }
  };
</script>

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"a" in obj

obj["a"]

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