Javascript Insertion Sort

insertion-sort.js

function ScriptoniteSort() {
    this.arr = [];
}

ScriptoniteSort.prototype = {
    swap: function(arr, index_one, index_two) {
        //swap
        var temp = arr[index_one];
        arr[index_one] = arr[index_two];
        arr[index_two] = temp;
    },

    validateCollection: function(datalist) {
        if(arguments.length === 0 || !Array.isArray(this.arr)) {
            throw new Error('Either No Arguments Passed, Or Passed Param is not an Array');
        }
    },

    insertionSort : function(datalist) {
        //assign the data property to the passed in datalist
        this.arr = datalist;
        //check if passed in is an array
        this.validateCollection(datalist);
        //set length of array
        var dataLength = this.arr.length;
        for (var i = 1; i < dataLength; i++) {
            var temp = this.arr[i];
            //placeholder is where we will insert
            var placeHolderIndex = i;
            while( (placeHolderIndex > 0) && (this.arr[placeHolderIndex-1] > temp) ) {
                //if condition is met then keep shifting the values
                this.arr[placeHolderIndex] = this.arr[placeHolderIndex-1];
                placeHolderIndex--;
            }
            this.arr[placeHolderIndex] = temp;
        }
        console.log("Insertion Sort Result: ", this.arr.toString());
    }
};

//var myArr = [9, 11, 5, 1, 7, 2, 15, 1];
//var myArr = [1, 7, 4, 0, 5, 3];
var myArr = [64, 25, 12, 22, 11];
var collection = new ScriptoniteSort();
collection.selectionSort(myArr);