Nodejs Array Equal equals(targetArray)

Method Source Code

// attach the .equals method to Array's prototype to call it on any array
Array.prototype.equals = function (targetArray) {
    // if the other array is a falsy value, return
    if (!targetArray)
        return false;

    // compare lengths - can save a lot of time 
    if (this.length != targetArray.length)
        return false;

    for (var i = 0, l=this.length; i < l; i++) {
        // Check if we have nested arrays
        if (this[i] instanceof Array && targetArray[i] instanceof Array) {
            // recurse into the nested arrays
            if (!this[i].equals(targetArray[i]))
                return false;       
        }           //from  w w w .  ja  v a2 s .  c  om
        else if (this[i] != targetArray[i]) {
            // Warning - two different object instances will never be equal: {x:20} != {x:20}
            return false;   
        }           
    }       
    return true;
}   //taken from http://stackoverflow.com/questions/7837456/comparing-two-arrays-in-javascript

Related

1. equals(other)

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

2. equals(other)

   function is_self_describing(n) {
       var digits = Number(n).toString().split("").map(function(elem) {return Number(elem)});
       var len = digits.length;
       var count = digits.map(function(x){return 0});
       digits.forEach(function(digit, idx, ary) {
           if (digit >= count.length)
               return false
           count[digit] ++;
       });
   ...
   

3. equals(other, callback = (x, y) => (x === y))

   Array.prototype.equals = function (other, callback = (x, y) => (x === y)) {
     if (Object.getPrototypeOf(this) !== Object.getPrototypeOf(other)) {
       return false;
     if (this.length === undefined || this.length !== other.length) {
       return false;
     return Array.prototype.every.call(this, (x, i) => callback(x, other[i]));
   };
   ...
   

4. equals(otherArray)

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

5. equals(target)

   var fs = require("fs");
   Array.prototype.equals = function(target) {
     if(this.length !== target.length) return false;
     for (var i=0; i<this.length; i++) {
       if(this[i] !== target[i]) return false;
     return true;
   module.exports.loadSheet = function(type2, name) {
   ...
   

6. equals(that)

   "use strict";
   Array.prototype.equals = function(that) {
     if(!Array.isArray(that)) {
       return false;
     if(this.length !== that.length) {
       return false;
     for(var i = 0; i < this.length; i++) {
   ...
   

7. equalsTo(arr)

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