Nodejs Array Sum sum()

Method Source Code

function extend(destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }/*  w  ww. j  a  v  a 2 s  . c  o m*/
    return destination;
}

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

if (!Array.prototype.indexOf) {
    Array.prototype.indexOf = function(elt /*, from*/) {
        var len = this.length >>> 0;

        var from = Number(arguments[1]) || 0;
        from = (from < 0) ? Math.ceil(from) : Math.floor(from);
        if (from < 0) {
            from += len;
        }
        for (; from < len; from++) {
            if (from in this && this[from] === elt) {
                return from;
            }
        }
        return -1;
    };
};

Related

1. sum()

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

2. sum()

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

3. sum()

   Array.prototype.sum = function () {
     return this.reduce(function (value, current) {
       return value + current;
     }, 0);
   };
   

4. sum()

   Array.prototype.sum = function () {
     return (!this.length) ? 0 : this.reduce((acc, value) => {
       return acc + value;
     });
   };
   

5. sum()

   Array.prototype.sum=function(){return this.reduce(function(s,n){return s+n})}
   function NumberAddition(str) {
     return str.replace(/[^\d]/g, ' ').split(' ').map(Number).sum();
   NumberAddition(readline());
   

6. sum()

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

7. sum()

   Math.TAU = Math.PI * 2;
   Array.prototype.sum = function()
     for (var i = 0, L = this.length, sum = 0; i < L; sum += this[i++]);
     return sum;
   Array.prototype.product = function()
     for (var i = 0, L = this.length, product = 1; i < L; product =  product * this[i++]);
   ...
   

8. sum()

   Array.prototype.sum = function(){
     return this.reduce(function(sum, item){
       return sum + item;
     }, 0)
   function isInt(n){
       return Number(n) === n && n % 1 === 0;
   function isFloat(n){
   ...
   

9. sum()

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