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weakmap vs map

Amjad Saeed answered on September 20, 2023 Popularity 7/10 Helpfulness 2/10

answer weakmap vs map

weakmap vs map

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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)





// 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)

Popularity 7/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript map weakmap

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Contributed on Sep 20 2023

Amjad Saeed

0 Answers Avg Quality 2/10

weakmap vs map

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