Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var testArr = [];
    var testMap = {};
    var testId = "SomeId9999";
    
    for(var i=0;i<10000;i++){
         testArr.push({id:"SomeId"+i, description:"asklfjasldkfjlasfjd"+i});
         testMap["SomeId"+i] = {id:"SomeId"+i, description:"asklfjasldkfjlasfjd"+i}
    }
  };
</script>

Test runner

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for(var index = 0;index < testArr.length; index++) {
    if(testArr[index].id === testId) {
         break;
    }
}

var output = testMap[testId];

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