Nodejs Array Sum sum()

Method Source Code

Array.prototype.sum = function() {
  return this.isEmpty() ? 0 : this.reduce( (a, b) => { return a + b} );
};

Related

1. sum()

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

2. sum()

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

3. sum()

   Array.prototype.sum = function(){
     var sum = 0;
     for (var i of this){
       sum += i;
     return sum;
   

4. sum()

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

5. sum()

   Array.prototype.sum = function(){
     return this.reduce((acc,x) => acc + x);
   

6. sum()

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

7. sum(array)

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

8. sum(begin, end)

   Array.prototype.sum = function(begin, end) {
     var total = 0;
     for (var i = begin >> 0 || 0, len = end + 1 >> 0 || this.length >> 0; i < len; i++) {
       total += +this[i] || 0;
     return total;
   };
   

9. sum(fun)

   Array.prototype.sum = function (fun) {
       var result = 0;
       this.forEach(x => result += fun ? fun(x) : x);
       return result;
   };