Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function fibo() {
    var first,second,add;
    for(var i=0;i<4;i++){
        if(i === 0){
            first = 1;
            second = 2;
        }
        add = first + second;
        first = second;
        second = add;
    
    }
    
    }
  };
</script>

Test runner

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try{
  fibo();
}
catch (e) 
{ 
  console.log(e);
}

if (typeof fibo() !== 'undefined' && fibo() !== null) {
 fibo();
}

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