freeCodeCamp Challenge Guide: Create a Set Class

Create a Set Class

Problem Explanation

  • A Set is an abstract data structure.
  • It can store unique value and the collection is unordered.
  • In this challenge, we have to implement .add() method. This method should only add unique values to collection.
    • The method should return true, if the value is sucessfully added to the collection, otherwise it should return false.


Solution 1 (Click to Show/Hide)
function Set() {
  // the var collection will hold our set
  var collection = [];
  // this method will check for the presence of an element and return true or false
  this.has = function(element) {
    return collection.indexOf(element) !== -1;
  // this method will return all the values in the set
  this.values = function() {
    return collection;
  this.add = function(el) {
    return this.has(el) ? false : Boolean(collection.push(el));

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