Nodejs Array Equal equals(b)

Method Source Code

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;
   for (var n = max; max >= n && n >= min; n--) {
    for (var m = max; max >= m && m >= min; m--) {
      var p = n * m;
      if (p.toString().split("").isPalindromic()) {
        if (p > palindrome) {
          palindrome = p;//from w  ww  .ja  v a2  s  .  co  m
        }
      }
    }
  }
  return palindrome;
}

Related

1. 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;
   ...
   

2. 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;
   ...
   

3. 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) {
   ...
   

4. 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) {
   ...
   

5. 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;
   

6. equals(element)

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

7. 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]) {
   ...
   

8. 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] ++;
       });
   ...
   

9. 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]));
   };
   ...