thmain

'use strict';

Array.prototype.reduce = function(callback, initialValue) {
  let counter;
  let accumulatedValue;

  if (this.length === 0) {
    return this;
  } else {
    if (arguments.length === 1) {

thmain

'use strict';

function reduce() {
  var boxarts = [{
      width: 200,
      height: 200
    }, {
      width: 150,
      height: 200
    }, {

thmain

'use strict';

Array.prototype.concatAll = function() {
  var results = [];
  this.forEach(function(subArray) {
    if (Array.isArray(subArray))
      subArray.forEach((item) => results.push(item))
    else
      throw new Error('Its not two dimensional array;');
  });

thmain

'use strict';

function queryNestedArray() {
  var movieLists = [{
      name: "New Releases",
      videos: [{
        "id": 70111470,
        "title": "Die Hard",
        "rating": 4.0
      }, {

thmain

'use strict';

function chain() {
  var newReleases = [{
    "id": 70111470,
    "title": "Die Hard",
    "rating": 4.0
  }, {
    "id": 654356453,
    "title": "Bad Boys",

thmain

'use strict';

function predicate() {
  var newReleases = [{
    "id": 70111470,
    "title": "Die Hard",
    "rating": 4.0
  }, {
    "id": 654356453,
    "title": "Bad Boys",

thmain

'use strict';

Array.prototype.filter = function(Predicate) {
  var result = [];

  this.forEach(function(itemInArray) {
    Predicate(itemInArray) ? result.push(itemInArray) : null;
  });

  return result;

thmain

'use strict';

function predicate() {
  var newReleases = [{
    "id": 70111470,
    "title": "Die Hard",
    "rating": 4.0
  }, {
    "id": 654356453,
    "title": "Bad Boys",

thmain

'use strict';

function projection() {
  var newReleases = [{
      "id": 70111470,
      "title": "Die Hard",
      "rating": [4.0]
    }, {
      "id": 654356453,
      "title": "Bad Boys",

thmain

'use strict';

Array.prototype.map = function(projectionFunction) {
  var results = [];
  this.forEach(function(itemInArray) {
    results.push(projectionFunction(itemInArray));

  });

  return results;