Nodejs Array Sum sum()

Here you can find the source of 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());