Nodejs Array Sum sum()

Method Source Code

Array.prototype.sum = function()
{
    var sum = 0;/*from  www .java2s.com*/
    for(var i = this.length; -- i >= 0 ;)
    {
        sum += (this[i] === null || this[i] === undefined) ? 0 : this[i];
    }

    return sum;
}

Related

1. sum()

   Array.prototype.sum = function () {
       var total = 0;
       var i = this.length;
       while (i--) {
           total += this[i];
       return total;
   function isEmpty(obj) {
   ...
   

2. sum()

   Array.prototype.sum = function () {
     return this.reduce((sum, n) => sum + Number(n), 0)
   

3. sum()

   Array.prototype.sum = function () {
     return this.reduce(function (total, aValue) {
       return total + Number(aValue);
     });
   };
   

4. sum()

   var log = console.log.bind(console)
   Array.prototype.sum = function() {
       return this.reduce(function(previous, current) {
           return previous + current
       })
   var numbers = [1, 2, 3, 4, 5, 6]
   var result = numbers.sum()
   log(result)
   ...
   

5. sum()

   Array.prototype.sum=function(){
      return this.reduce(function(s,n){return s+n})
   

6. sum()

   Array.prototype.sum = function() {
     for(var sum = i = 0; i < this.length; i++) {
       sum += this[i]
     return sum
   var arr = [1,21,3,4,22,45,6,7,32];
   console.log(arr.join("+")+"="+arr.sum());
   

7. sum()

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

8. sum()

   Array.prototype.sum = function(){
     for (var i = 0, sum = 0 ; i != this.length; ++i) {
       var n = this[i];
       if(!isNaN(n)) {
         sum += n*1;
     return sum;
   };
   ...
   

9. sum()

   Array.prototype.sum = function(){
     return this.reduce( (a,b) => a + b, 0)