const weakMap = new WeakMap();

console.log(weakMap); // WeakMap {} 

​

let obj = {};

​

// adding object (element) to WeakMap

weakMap.set(obj, 'hello');

​

console.log(weakMap); // WeakMap {{} => "hello"}

/*

    SIMPLE EXPLANATION:

​

    The WeakMap takes only objects as keys. 

    When one object is not being referred to anymore, it and its

    associated value will get removed from the WeakMap.

​

    The WeakSet functions similarly.

    Its values are unique and are only objects.

    When one object is not being referred to anymore, it will get removed

    from the WeakSet.

*/

const weakMap = new WeakMap();

console.log(weakMap); // WeakMap {} 

​

let obj = {};

​

// adding object (element) to WeakMap

weakMap.set(obj, 'hello');

​

console.log(weakMap); // WeakMap {{} => "hello"}

// get the element of a WeakMap

console.log(weakMap.get(obj)); // hello

// check if an element is present in WeakMap

console.log(weakMap.has(obj)); // true

// delete the element of WeakMap

console.log(weakMap.delete(obj)); // true

​

console.log(weakMap); // WeakMap {}

const weakMap = new WeakMap();

console.log(weakMap); // WeakMap {} 

​

let obj = {};

​

// adding object (element) to WeakMap

weakMap.set(obj, 'hello');

​

console.log(weakMap); // WeakMap {{} => "hello"}

// get the element of a WeakMap

console.log(weakMap.get(obj)); // hello

// check if an element is present in WeakMap

console.log(weakMap.has(obj)); // true

// delete the element of WeakMap

console.log(weakMap.delete(obj)); // true

​

console.log(weakMap); // WeakMap {}

// Create a WeakMap

const weakMap = new WeakMap();

​

// Create some objects

const obj1 = {};

const obj2 = {};

​

// Associate data with objects in the WeakMap

weakMap.set(obj1, "Data for obj1");

weakMap.set(obj2, "Data for obj2");

​

// Retrieve data using objects as keys

console.log(weakMap.get(obj1)); // "Data for obj1"

console.log(weakMap.get(obj2)); // "Data for obj2"

​

// Let's simulate losing all references to obj1

obj1 = null;

​

// obj1 is no longer accessible, so it can be garbage collected

// This means the associated data is also automatically removed

console.log(weakMap.get(obj1)); // undefined

console.log(weakMap.get(obj2)); // "Data for obj2" (still accessible)

​