Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var array = [], countDuplicates = 0;
    
    function getRandom(min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }
    
    function populateArray() {
        for (var i = 0; i < 1000000; i++) {
            array.push({
                name: "name_" + i,
                size: getRandom(100, 1000)
            });
        }
    }
    
  };
</script>

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for (var i = 0, length = array.length; i < length; i++) {
        if (array[i].name === "name_9999") {
        countDuplicates++;
    }
}

for (var i = 0, length = array.length; i < length; i++) {
        if (array[i].name === "name_9999" && size == 800) {
        countDuplicates++;
    }
}

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