Nodejs Array Equal equals(array)

Method Source Code

/*/*w w w.  j a v a2  s.  c om*/
 * Compare two arrays
 *
 * Attach the .equals method to Array's prototype to call it on any array
 * [1, 2, [3, 4]].equals([1, 2, [3, 2]]) === false;
 * [1, "2,3"].equals([1, 2, 3]) === false;
 * [1, 2, [3, 4]].equals([1, 2, [3, 4]]) === true;
 * [1, 2, 1, 2].equals([1, 2, 1, 2]) === true;
 */

Array.prototype.equals = function (array) {
  // if the other array is a falsy value, return
  if (!array)
    return false;

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

  for (var i = 0, l = this.length; i < l; i++) {
    // Check if we have nested arrays
    if (this[i] instanceof Array && array[i] instanceof Array) {
      // recurse into the nested arrays
      if (!this[i].equals(array[i]))
        return false;
    }
    else if (this[i] != array[i]) {
      // Warning - two different object instances will never be equal: {x:20} != {x:20}
      return false;
    }
  }
  return true;
}

Related

1. equals(array)

   Array.prototype.equals = function (array)
       if (!array)
           return false;
       if (this.length != array.length)
           return false;
   ...
   

2. equals(array)

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

3. equals(array)

   if(Array.prototype.equals)
       console.warn("Overriding existing Array.prototype.equals. Possible causes: New API defines the method, there's a framework conflict or you've got double inclusions in your code.");
   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) {
   ...
   

4. equals(array)

   function toRadians(degrees) { return degrees * (Math.PI / 180);}
   function toDegrees(radians) { return radians * (180 / Math.PI);}
   Array.prototype.equals = function (array) {
       if (!array) { return false; }
       else 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; }
           else if (this[i] != array[i]) { return false; }
       return true;
   };
   function unitVector(vector) {
       return vector.map(function(v) { return parseFloat(v)/norm(vector); });
   function norm(vector) {
       return Math.sqrt(vector.map(
           function(v) { return v*v; }).reduce(
               function(a, b) { return a + b; }));
   function angleOf(vector) { return Math.atan(vector[1]/vector[0]); }
   

5. 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;
   ...
   

6. equals(array, strict)

   Array.prototype.equals = function (array, strict) {
       if (!array)
           return false;
       if (arguments.length == 1)
           strict = true;
       if (this.length != array.length)
           return false;
       for (var i = 0; i < this.length; i++) {
           if (this[i] instanceof Array && array[i] instanceof Array) {
   ...
   

7. equals(array, strict)

   function gridToCanvas(gridX, gridY) {
     var canvasX = gridX * 16;
     var canvasY = gridY * 16; 
     return [canvasX, canvasY];
   function isInt(num) {
     return !(num % 1 != 0);
   Array.prototype.equals = function (array, strict) {
   ...
   

8. equals(array, strict)

   Array.prototype.equals = function(array, strict){
     if(this.length!=array.length)
       return false;
     if(arguments.length == 1)
       strict = true;
     if(!strict){
       this.sort((x,y) => x-y);
       array.sort((x,y) => x-y);
     for(var i = 0; i < this.length; i++){
       if(this[i]!=array[i]){
         return false;
     return true;
   

9. equals(b)

   function arraysEqual(a,b) { return !!a && !!b && !(a<b || b<a); }
   Array.prototype.equals = function(b) {
     return arraysEqual(this, b);
   Array.prototype.isPalindromic = function() { return this.concat().equals(this.reverse()); }
   function getHighestPalindrome () {
     var max = 1000;
     var min = 100;
     var palindrome = 0;
   ...