Nodejs Array Sum sumItems()

Method Source Code

Array.prototype.sumItems = function(){
  var sum = 0;//from w  ww . jav a  2  s.  c  om
  for(var i=0; i<this.length; i++){
     sum=sum+this[i];
  }
  
  return(sum);
}
//creating arrays to test the code
var arr = new Array;
arr = [5,10];
arr.push(50);
arr.sumItems();


var myArray = [1,2,3,4,5,6,7,8,9,10];
myArray.sumItems();

Related

1. sum(s)

   Array.prototype.sum = function (s) {
     s = s || Selector;
     var l = this.length;
     var sum = 0;
     while (l-- > 0) sum += s(this[l]);
     return sum;
   };
   

2. sum(selector)

   Array.prototype.sum = function(selector) {
       if (typeof selector !== 'function') {
           selector = function(item) {
               return item;
       var sum = 0;
       for (var i = 0; i < this.length; i++) {
           sum += selector(this[i]);
   ...
   

3. sum(selectorfun)

   Array.prototype.sum = function(selectorfun)
     if (selectorfun)
       return this.map(selectorfun).sum();
     else
       var ret = 0;
   ...
   

4. sum(xAndY)

   Array.prototype.sum = function(xAndY){
     var count = 0;
     for(var i = 0; i < this.length; i++)
       count += xAndY(this[i])
     return count;
   

5. sumArrayItems()

   Array.prototype.sumArrayItems = function() {
     var countIndex = this.length - 1;
     var sum =0;
     while ( countIndex >= 0) {
       sum = sum + this[ countIndex ];
       countIndex--;
     return sum;
   var findMissing = function( arr1 , arr2 ) {
     return Math.abs( arr1 - arr2);
   findMissing([1,2].sumArrayItems() , [1,2,5].sumArrayItems());