What are WeakMap and WeakSet in JavaScript?

Can you explain what WeakMap and WeakSet are in JavaScript?

Sure! WeakMap is a collection of key-value pairs where keys are objects and values can be any value. WeakSet is similar but only stores objects.

What are the benefits of using WeakMap and WeakSet?

The main benefits are memory efficiency and garbage collection. WeakMap and WeakSet allow for automatic cleanup of unused objects.

Can you give me an example of how to use WeakMap?

Absolutely! Here's a simple example:

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

How does WeakSet differ from a regular Set?

WeakSet only holds weak references to its objects, meaning if there are no other references to an object, it can be garbage collected.