Nodejs Array Sum sum()

Method Source Code

var log = console.log.bind(console)

Array.prototype.sum = function() {
    return this.reduce(function(previous, current) {
        return previous + current
    })//from   w w w .ja  v a 2s  . c  om
}

var numbers = [1, 2, 3, 4, 5, 6]
var result = numbers.sum()
log(result)

String.prototype.capitalize = function() {
    // log('in')
    return this.charAt(0).toUpperCase() + this.substring(1)
}

var message = 'hello world!'
log(message.capitalize())

Related

1. 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);
   ...
   

2. sum()

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

3. sum()

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

4. sum()

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

5. sum()

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

6. sum()

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

7. sum()

   Array.prototype.sum = function()
       var sum = 0;
       for(var i = this.length; -- i >= 0 ;)
           sum += (this[i] === null || this[i] === undefined) ? 0 : this[i];
       return sum;
   

8. 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());
   

9. sum()

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