WeakMap.prototype.get()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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La méthode get() permet de renvoyer un élément donné d'un objet WeakMap.

Exemple interactif

const weakmap1 = new WeakMap();
const object1 = {};
const object2 = {};

weakmap1.set(object1, 42);

console.log(weakmap1.get(object1));
// Expected output: 42

console.log(weakmap1.get(object2));
// Expected output: undefined

Syntaxe

wm.get(clé);

Paramètre

clé: Ce paramètre est obligatoire. Il correspond à la clé de l'élément qu'on souhaite récupérer depuis l'objet WeakMap.

Valeur de retour

L'élément associé à la clé donnée ou undefined si la clé ne peut pas être trouvée dans l'objet WeakMap.

Exemples

var wm = new WeakMap();
wm.set(window, "toto");

wm.get(window); // Renvoie "toto"
wm.get("machin"); // Renvoie undefined.

Spécifications

Specification
ECMAScript® 2025 Language Specification # sec-weakmap.prototype.get

Compatibilité des navigateurs

Report problems with this compatibility data on GitHub

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Deno	Node.js
`get`

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Full support: Full support
: See implementation notes.

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