Nodejs Array Equal equals(other)

Method Source Code

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] ++;//from   ww w .  j av a 2  s.c o m
    });

    return digits.equals(count);
}

Array.prototype.equals = function(other) {
    if (this === other)
        return true;  // same object
    if (this.length != other.length)
        return false;
    for (idx in this)
        if (this[idx] !== other[idx])
            return false;
    return true;
}

for (var i=1; i<=3300000; i++)
    if (is_self_describing(i))
        print(i);

Related

1. 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) {
   ...
   

2. 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;
   

3. 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;
   ...
   

4. 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;
   

5. 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]) {
   ...
   

6. 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]));
   };
   ...
   

7. 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;
   ...
   

8. 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) {
   ...
   

9. equals(targetArray)

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