Nodejs Array Average findAverage()

Method Source Code

/*//from w w w .  ja  v  a  2 s  .c om
ANSWER
It takes into account findAverage method which comes from prototype.

EXPLANATION
for-in loop loops through keys of all properties of object.
By default it also loops through keys coming from prototype.
*/

Array.prototype.findAverage = function(){
    var length = this.length;
    var average = 0;
    for(var i = 0; i < length; i++){
        var value = this[i];
        average += value;
    }
    return average / length;
}

var numbers = [1, 34, 5, 17, 2, 3, 90];

var average = numbers.findAverage();

Related

1. avg()

   Array.prototype.avg = function(){
     return this.sum() / this.length;
   };
   Array.prototype.sum = function(){
     for (var i = 0, sum = 0 ; i != this.length; ++i) {
       var n = this[i];
       if(!isNaN(n)) {
         sum += n*1;
     return sum;
   };
   

2. avg()

   Array.prototype.avg = function() {
     var av, num, _i, _len;
     av = 0;
     for (_i = 0, _len = this.length; _i < _len; _i++) {
       num = this[_i];
       av = av + num;
     return av / this.length;
   };
   ...
   

3. avg()

   Array.prototype.avg = function() {
     var av = 0;
     var cnt = 0;
     var len = this.length;
     for (var i = 0; i < len; i++) {
       var e = +this[i];
       if(!e && this[i] !== 0 && this[i] !== '0') e--;
       if (this[i] == e) {av += e; cnt++;} }
     return av/cnt;
   ...
   

4. avg()

   Array.prototype.avg = function () {
     var sum=0;
     var drops=this.drops();
     for (var i = 0; i < this.length; i++)
       if (+this[i] !== 0)
         sum += +this[i];
     return (sum/(this.length-drops));
   

5. findAverage()

   Array.prototype.findAverage = function(){
       var length = this.length;
       var average = 0;
       for(var i = 0; i < length; i++){
           var value = this[i];
           average += value;
       return average / length;
   var numbers = [1, 34, 5, 17, 2, 3, 90];
   var average = numbers.findAverage();
   for(key in numbers) {
       var message = key + ' = ' + numbers[key];
       if(numbers[key] < average){
           message += ' \\/'
       else {
           message += ' /\\'
       console.log(message);