Javascript Data Structure Tutorial - Javascript Shell sort

function MyArray(numElements) { //w w w .ja  v  a2s .com
    this.dataStore = []; 
    this.pos = 0; 
    this.numElements = numElements; 
    this.insert = insert; 
    this.toString = toString; 
    this.clear = clear; 
    this.setData = setData; 
    this.swap = swap; 
    this.shellsort = shellsort;
    
    this.gaps = [5,3,1]; 
    this.setGaps = setGaps;
    for (var i = 0; i < numElements; ++i) { 
        this.dataStore[i] = i; 
    } 
} 
function setGaps(arr) { 
    this.gaps = arr; 
} 

function setData() { 
    for (var i = 0; i < this.numElements; ++i) { 
        this.dataStore[i] = Math.floor(Math.random() * (this.numElements+1)); 
    } 
} 

function clear() { 
    for (var i = 0; i < this.dataStore.length; ++i) { 
        this.dataStore[i] = 0; 
    } 
} 
function insert(element) { 
    this.dataStore[this.pos++] = element; 
} 
function toString() { 
    var retstr = ""; 
    for (var i = 0; i < this.dataStore.length; ++i) { 
        retstr += this.dataStore[i] + " "; 
        if (i > 0 && i % 10 == 0) { 
            retstr += "\n"; 
        } 
    } 
    return retstr; 
} 
function swap(arr, index1, index2) { 
    var temp = arr[index1]; 
    arr[index1] = arr[index2]; 
    arr[index2] = temp; 
} 
function shellsort() { 
    for (var g = 0; g < this.gaps.length; ++g) { 
        for (var i= this.gaps[g]; i < this.dataStore.length; ++i) { 
            var temp = this.dataStore[i]; 
            for (var j = i; j >= this.gaps[g] && this.dataStore[j-this.gaps[g]] > temp; j -= this.gaps[g]) { 
                this.dataStore[j] = this.dataStore[j -this.gaps[g]]; 
            } 
            this.dataStore[j] = temp; 
        } 
    } 
} 

var numElements = 10; 
var mynums = new MyArray(numElements); 
mynums.setData(); 
console.log(mynums.toString()); 
mynums.shellsort(); 
console.log(); 
console.log(mynums.toString());