Nodejs Array Equal equals(arr)

Method Source Code

/*/*  w  w w  . j a va 2s. co m*/
 * Generic helper functions
 * ================================================================================
 * This module currently only offers on method to check, whether two arrays are
 * equal.
 * This module is tested in tests/helpersTest.js
 */

/*
 * Check if two arrays are equal.
 * Works even on nested arrays.
 * Usage:
 *     >> [1, [2, [3, 4]]].equals([1, [2, [3, 4]]]
 *     true
 */
Array.prototype.equals = function (arr) {
   if (this.length != arr.length) return false;
   return this.reduce(function (acc, el, i) {
   if (_.isArray(el)) return acc && el.equals(arr[i]);
   return acc && el === arr[i];
}, true)};

Related

1. equalTo(compareTo)

   Array.prototype.equalTo = function(compareTo) {
     if (this.length !== compareTo.length) {
       return false;
     for(var i = 0; i < compareTo.length; i++) {
       if (this[i] !== compareTo[i]) {
         return false;
     return true;
   };
   

2. equals(arr)

   Array.prototype.equals = function(arr) {
     var len = arr.length;
     if (this.length !== len) {
       return false;
     for (var i = 0; i < len;i ++) {
       if (this[i] !== arr[i]) {
         return false;
     return true;
   };
   var arr = [1, 2, 3];
   var arr2 = [1, 2, 3];
   var bol = arr.equals(arr2);
   console.log(bol); 
   

3. equals(arr)

   Array.prototype.equals = function (arr) {
     const len = this.length
     if (len !== arr.length) {
       return false
     for (let i = 0; i < len; i++) {
       if (this[i] !== arr[i]) {
         return false
     return true
   const a = [1, 2].equals([1, 2]) 
   const b = [1, 2].equals([0]) 
   console.log(a, b)
   

4. equals(arr)

   Array.prototype.equals = function(arr) {
     const len = this.length
     if (len !== arr.length) {
       return false
     for (let i = 0; i < len; i++) {
       if (this[i] !== arr[i]) {
         console.log(222,this[i])
         return false
   ...
   

5. equals(arr)

   "use strict";
   var pairToCoords = function pairToCoords(pair) {
     return { x: pair[0], y: pair[1] };
   };
   var coordsToPair = function coordsToPair(coords) {
     return [coords.x, coords.y];
   };
   coordsToPair(pairToCoords([1, 2])); 
   pairToCoords(coordsToPair({ x: 1, y: 2 })); 
   ...
   

6. equals(arr)

   Array.prototype.equals = function(arr) {
     if(!this || !arr) {
       return false
     if(this.length != arr.length) {
       return false
     for(i = 0; i < arr.length; i++) {
       if (this[i] != arr[i]) {
   ...
   

7. equals(array)

   Array.prototype.equals = function(array) {
     if (!array)
       return false;
     if (this.length !== array.length)
       return false;
     return this.every((x, i) => x === array[i]);
   };
   const a1 = [1,2,3];
   const a2 = [1,2,3];
   ...
   

8. equals(array)

   Array.prototype.equals = function (array) {
       for(var i = 0; i < this.length; i++){
           if(this[i] != array[i]){
               return false;
       return true;
   

9. equals(array)

   Array.prototype.equals = function (array) {
       if (!array)
           return false;
       if (this.length != array.length)
           return false;
       for (var i = 0, l=this.length; i < l; i++) {
           if (this[i] instanceof Array && array[i] instanceof Array) {
               if (!this[i].equals(array[i]))
                   return false;
   ...