Info

Array.map - Array.sort - for - While

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function mapBySort(func, thisArg){
        var thisArr = this;
        thisArr.func = func;
        thisArg = thisArg || this;
        var newArr = [];
    
        if (typeof  func == "function"){
                var len = thisArr.length;
                var index = 0;
                var finalVal = thisArr[len - 1];
                thisArr.sort(function(a,b){
                        newArr.push(thisArg.func(a));
                        return 0;
                });
                newArr.push(thisArg.func(finalVal));
        }
        return newArr;
    };
    
    function mozillaMap(callback, thisArg) {
        var T, A, k;
        if (this == null) {
                throw new TypeError(" this is null or not defined");
        }
        var O = Object(this);
        var len = O.length >>> 0;
        if (typeof callback !== "function") {
                throw new TypeError(callback + " is not a function");
        }
        if (thisArg) {
                T = thisArg;
        }
        A = new Array(len);
        k = 0;
        while(k < len) {
                var kValue, mappedValue;
                if (k in O) {
                        kValue = O[ k ];
                        mappedValue = callback.call(T, kValue, k, O);
                        A[ k ] = mappedValue;
                }
                k++;
        }
        return A;
    };
    
    function mapByMap(func, thisArg){
        return this.map(func, thisArg);
    }
    
    var mapFunc = function(val){
        return val * 10;
    }
    
    var someArr = [0,1,2,3,4,5,6,7,8,9];
  };

  Benchmark.prototype.teardown = function() {
    otherArr1 = undefined;
    otherArr2 = undefined;
    otherArr3 = undefined;
  };
</script>

Test runner

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var otherArr1 = mapBySort.call(someArr, mapFunc);

var otherArr2 = mozillaMap.call(someArr, mapFunc);

var otherArr3 = mapByMap.call(someArr, mapFunc);

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