Nodejs Array Sum sum()

Method Source Code

// extending array with sum and max methods

Array.prototype.sum = function(){
   for(var i=0,sum=0;i<this.length;sum+=this[i++]);
   return sum;/*from   ww w  . j a  v a2 s . co  m*/
}
Array.prototype.max = function(){
   return Math.max.apply({},this)
}
Array.prototype.first = function(){
   return this[0];
}
Array.prototype.last = function(){
   return this[this.length-1];
}

Related

1. sum()

   Array.prototype.sum = function() {
     total = 0;
     for (var i=0;i < this.length;i++) {
       total += this[i];
     return total;
   };
     var a = [];
     for (var i=0;i < 1000;i++) {
   ...
   

2. sum()

   var ary1 = new Array(12, 55, 43, 32, 44);
   var ary2 = new Array(12, 33, 1);
   Array.prototype.sum = function() {
       var output = 0;
       for (var i = 0; i < this.length; i++) {
           output += this[i];
       return output;
   };
   ...
   

3. sum()

   Array.prototype.sum = function(){
     var sum = 0;
     for(var index in this){
       if(typeof this[index] === "number"){
         sum += this[index];
     return sum;
   var numbers = [1,2,3,4,5];
   console.log(numbers.sum());
   

4. sum()

   Array.prototype.sum = function(){
     var sum = 0;
     for(var i = 0; i < this.length; i++){
       if(typeof this[i] === "number"){
         sum += this[i];
     return sum;
   var numbers = [1,2,3,4,5];
   console.log(numbers.sum());
   

5. sum()

   var ary1 = new Array(12, 55, 43, 32, 44);
   var ary2 = new Array(12, 33, 1);
   Array.prototype.sum = function() {
       var output = 0;
       for (var i = 0; i < this.length; i++) {
           output += this[i];
       return output;
   };
   ...
   

6. sum()

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

7. sum()

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

8. 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);
   ...
   

9. 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);
   ...