Creating a vanilla dictionary

index.js

const dict = {};
dict.__proto__; // => {}
console.log(dict.hasOwnProperty); // => f hasOwnProperty() {}

const emptyDict = Object.create(null);
emptyDict.__proto__; // => undefined
emptyDict.hasOwnProperty; // => undefined


// ❗️ Anyone can modify the object prototype from the outside
Object.prototype.myFunction = function () {};

// ❌ As you can see here, dict was affected.
dict.myFunction; // => f () {}

// ✅ But our emptyDict remains unaffected!
emptyDict.myFunction; // => undefined