JavaScript weakMap get() Method

The JavaScript weakMap get method is used to retrieve the value of a specified key of an element from a WeakMap object.

Syntax

weakMap.get(key);

Parameters

key:  The key of the element to return from the WeakMap object.

Return Value

It returns the value of a specified key. If the key can not be found, undefined is returned.

Example 1: How to Use JavaScript weakMap get() Method

let weakMap = new WeakMap();
let key1 = {};
let key2 = {};

weakMap.set(key1, "Taylor Swift");
weakMap.set(key2, "Selena Gomez");

console.log(weakMap.get(key1));
console.log(weakMap.get(key2));

Output

Taylor Swift
Selena Gomez

Example 2

let weakMap = new WeakMap();
let key1 = {};
let key2 = {};

weakMap.set(key1, 79);

console.log(weakMap.get(key1));
console.log(weakMap.get(key2));

Output

79
undefined

In the above example, it returns undefined because we haven’t set the value of key 2.

Browser Compatibility

That’s it!

Related posts

JavaScript WeakMap

JavaScript WeakMap set() Method

JavaScript WeakMap has() Method

JavaScript WeakMap delete() Method

Krunal

Krunal Lathiya is a seasoned Computer Science expert with over eight years in the tech industry. He boasts deep knowledge in Data Science and Machine Learning. Versed in Python, JavaScript, PHP, R, and Golang. Skilled in frameworks like Angular and React and platforms such as Node.js. His expertise spans both front-end and back-end development. His proficiency in the Python language stands as a testament to his versatility and commitment to the craft.