JavaScript WeakMap

SAMER SAEID answered on May 21, 2022 Popularity 10/10 Helpfulness 2/10

answer JavaScript WeakMap

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JavaScript WeakMap

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const weakMap = new WeakMap();
console.log(weakMap); // WeakMap {} 

let obj = {};

// adding object (element) to WeakMap
weakMap.set(obj, 'hello');

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

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Contributed on May 21 2022

SAMER SAEID

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what is weakmap and weakset in javascript

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/*
	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.
*/

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Contributed on Sep 11 2022

kid amogus

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JavaScript WeakMap Methods

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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 {}

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Contributed on May 21 2022

SAMER SAEID

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JavaScript WeakMap Methods

Comment

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 {}

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Contributed on May 21 2022

SAMER SAEID

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weakmap

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// 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)

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Contributed on Sep 20 2023

Amjad Saeed

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JavaScript WeakMap

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