Nodejs Array Sum sum()

Method Source Code

Array.prototype.sum = function () {
    var total = 0;
    var i = this.length;

    while (i--) {
        total += this[i];/* w w w .  ja  v a  2s  .  co m*/
    }

    return total;
}

function isEmpty(obj) {
    if(obj === undefined || obj === null){
        return true
    }
    if(Array.isArray(obj)) {
        return obj.length === 0
    }
    else{
        return Object.keys(obj).length === 0;
    }
}

Related

1. sum()

   Array.prototype.sum = function () {
     return this.reduce(function(sum, val){ 
       return sum + val
     })
   console.log([1, 2, 3, 4].sum());
   

2. sum()

   Array.prototype.sum = function() {
     return this.reduce((result, element) => result + element, 0);
   };
   

3. sum()

   function range(a, b) {
       return [...Array(b-a).keys()].map(x => x + a);
   Array.prototype.sum = function() {
       return this.reduce((a, b) => a + b, 0);
   module.exports = function(n) {
       var sumOfSquares = range(1,101).map(x => x*x).sum();
       var squareOfSum = Math.pow(range(1,101).sum(), 2);
   ...
   

4. sum()

   Array.prototype.sum = function() {
     return this.reduce(function(p, c, i, arr) {
       return p + c;
     });
   };
   var a = [];
   process.stdin.resume();
   process.stdin.setEncoding("utf8");
   process.stdin.on("data", getNum);
   ...
   

5. sum()

   Array.prototype.sum = function(){
     var val = 0;
     this.forEach(function(v){
       val +=v;
     });
     return val;
   };
   

6. sum()

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

7. sum()

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

8. 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)
   ...
   

9. sum()

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