Nodejs Array Median median()

Method Source Code

// Write a method that returns the median of elements in an array
// If the length is even, return the average of the middle two elements

Array.prototype.median = function() {
  let mid = Math.floor(this.length / 2);
  if (this.length % 2 === 0){
    return (this[mid] + this[mid+1]) / 2;
  } else {/*from ww  w .j av  a 2 s. c  o m*/
    return this[mid];
  }
};


console.log([1,2,3,4,5,6].median()); // 4.5
console.log([1,2,3,4,5].median()); // 3

Related

1. median()

   Array.prototype.median = function() {
       var middle = Math.floor(this.length / 2);
       var evenMiddle = (this[middle-1] + this[middle]) / 2;
       if (this.length % 2 == 0) {
           return evenMiddle;
       } else {
           return this[middle];
   

2. median()

   Array.prototype.median = function() {
     var length = this.length;
     if(length % 2 != 0){
       return this[Math.floor(length/2)];
     } else {
       return (this[(length/2) - 1] + this[length/2])/2
   };
   

3. median()

   Array.prototype.median = function() {
     this.sort();
     if (this.length % 2 === 0) {
       var middle = this.length / 2 - 1;
       return (this[middle] + this[middle + 1]) / 2;
     } else {
       var middle = Math.floor(this.length / 2);
       return this[middle];
   };
   

4. median()

   Array.prototype.median = function() {
     if((this.length - 1) % 2 == 0){
       return this[(this.length - 1) / 2];
     else {
       var eOne = this[Math.floor((this.length - 1) / 2)]
       var eTwo = this[Math.ceil((this.length - 1) / 2)]
       return (eOne + eTwo) / 2