Nodejs Array Sum sum()

Method Source Code

Array.prototype.sum /* -> sum */ = function() {
    var res = 0;/* w w  w  .  j a  v a 2s. c o  m*/
    for(var p in this)
   res += this[p];
    return res;
};

var a = [1, 2, 3];
console.log(0 in a);

Related

1. sum()

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

2. sum()

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

3. sum()

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

4. sum()

   Array.prototype.sum = function() {
       var res = 0;
       for(var p in this)
     res += this[p];
       return res;
   };
   var s = [1, 2, 3].sum();
   

5. sum()

   Array.prototype.sum = function() {
     return this.reduce(function(prev, curr) {
       return prev + curr;
     });
   };
   module.exports = Array.prototype.sum;
   

6. sum()

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

7. sum()

   Array.prototype.sum = function () {
     var sum = 0;
     for (var i = 0; i < this.length; i++) {
       sum += this[i];
     };
     return sum;
   console.log([1, 3, 12, 33, 2].sum());
   

8. sum()

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

9. sum()

   const assert = require('assert')
   Array.prototype.sum = function() {
     return this.reduce((sum, el) => sum + el, 0)
   assert.equal([].sum(), 0)
   assert.equal([2, 5, 7].sum(), 14)