Suggested solution for Data Structures: Create a Map Data Structure

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Solution 
var Map = function() {
  this.collection = {};

  this.add = (key,value) => {
    this.collection[key] = value;
  };
  
  this.remove = key => {
    if(this.has(key)) {
      delete this.collection[key];
    }
  };

  this.get = key => {
    return this.collection[key] || null;
  };

  this.has = key => {
    return this.get(key) !== null;
  };

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

  this.size = () => {
    return this.values().length;
  };

  this.clear = () => {
    this.collection = {};
  };
};

Challenge: Create a Map Data Structure

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