// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/create-a-map-data-structure

var Map = function () {
  this.collection = {};
  // Only change code below this line
  this.add = (k, v) => {
    this.collection[k] = v;
  };

  this.remove = (k) => {
    delete this.collection[k];
  };

  this.get = (k) => {
    return this.collection[k];
  };

  this.has = (k) => {
    return this.collection[k] !== undefined;
  };

  this.values = () => {
    return Object.values(this.collection);
  };

  this.size = () => {
    return Object.keys(this.collection).length;
  };

  this.clear = () => {
    this.collection = {};
  };
  // Only change code above this line
};