Nodejs Array Sum sum( iterator )

Method Source Code

/**/*from   w  ww. j  ava2 s.c  o  m*/
* Paste bin for general JavaScript language extensions to be compiled into the production
* and lexically scoped out via an anonomous function.
*/


// sum fn extension to the Array object can recursive sum up array values
Array.prototype.sum = function ( iterator ) {
   "use strict";
   var i = ( typeof iterator === "undefined" ) ?  0 : iterator,
      total = 0;

   // check for nested array structure
   if ( this[ i ] instanceof Array ) {
      for ( i; i < this.length; i++) {
         // now sum rows by recursing into this fn
         total += this[i].sum();
      }
   }
   else {
   // not a nested structure
      for (i = 0; i < this.length; i++) {
         total += this[i];
      }
   }

   return total;
};

Related

1. sum()

   Array.prototype.sum = function() {
     return this.reduce(function(a,b){return a+b;});
   };
   

2. sum()

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

3. sum()

   Array.prototype.sum = function () {
     let s = 0;
     for (let i = 0; i < this.length; i++) {
       s += this[i];
     return s;
   };
   

4. sum()

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