Nodejs Array Sum sum()

Method Source Code

//adding a method to arrays to sum their number elements
Array.prototype.sum = function(){
  var sum = 0;/*w  ww . ja  va2s.co m*/
  for(var index in this){
    if(typeof this[index] === "number"){
      sum += this[index];
    }
  }
  return sum;
}

var numbers = [1,2,3,4,5];
console.log(numbers.sum());
//logs 15

Related

1. sum()

   Array.prototype.sum = function(){
     for(var i=0,sum=0;i<this.length;sum+=this[i++]);
     return sum;
   Array.prototype.max = function(){
     return Math.max.apply({},this)
   Array.prototype.min = function(){
     return Math.min.apply({},this)
   ...
   

2. sum()

   Array.prototype.sum = function() {
     var i;
     var s:Number = 0;
     for (i=0; i < this.length; i++) {
       s += Number(this[i]);
     return s;
   var test = new Array(1, 2, 3);
   ...
   

3. sum()

   'use strict';
   Array.prototype.sum = function () {
       var total = 0;
       var i = this.length;
       while (i--) {
           total += this[i];
       return total;
   };
   ...
   

4. sum()

   Array.prototype.sum = function() {
     total = 0;
     for (var i=0;i < this.length;i++) {
       total += this[i];
     return total;
   };
     var a = [];
     for (var i=0;i < 1000;i++) {
   ...
   

5. sum()

   var ary1 = new Array(12, 55, 43, 32, 44);
   var ary2 = new Array(12, 33, 1);
   Array.prototype.sum = function() {
       var output = 0;
       for (var i = 0; i < this.length; i++) {
           output += this[i];
       return output;
   };
   ...
   

6. sum()

   Array.prototype.sum = function(){
     var sum = 0;
     for(var i = 0; i < this.length; i++){
       if(typeof this[i] === "number"){
         sum += this[i];
     return sum;
   var numbers = [1,2,3,4,5];
   console.log(numbers.sum());
   

7. sum()

   var ary1 = new Array(12, 55, 43, 32, 44);
   var ary2 = new Array(12, 33, 1);
   Array.prototype.sum = function() {
       var output = 0;
       for (var i = 0; i < this.length; i++) {
           output += this[i];
       return output;
   };
   ...
   

8. sum()

   Array.prototype.sum = function(){
     for(var i=0,sum=0;i<this.length;sum+=this[i++]);
     return sum;
   Array.prototype.max = function(){
     return Math.max.apply({},this)
   Array.prototype.first = function(){
     return this[0];
   ...
   

9. sum()

   Array.prototype.sum = function () {
     return this.reduce(function(sum, val){ 
       return sum + val
     })
   console.log([1, 2, 3, 4].sum());