How do I use Weak Maps in JavaScript?

What are Weak Maps in JavaScript?

Weak Maps are collections of key-value pairs where keys are objects and values can be any value. They allow for garbage collection of keys.

How do I create a Weak Map?

You can create a Weak Map using the new WeakMap() constructor. For example: const myWeakMap = new WeakMap();.

What are the benefits of using Weak Maps?

Weak Maps prevent memory leaks by allowing keys to be garbage collected when there are no other references to them.

Can you give me an example of using a Weak Map?

Sure! Here's a simple example:

const weakMap = new WeakMap();
const obj = {};
weakMap.set(obj, 'value');
console.log(weakMap.get(obj)); // 'value'