WeakSet.prototype.add()

Baseline Widely available

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

La méthode add() permet d'ajouter un nouvel objet à un objet WeakSet.

Exemple interactif

const weakset1 = new WeakSet();
const object1 = {};

weakset1.add(object1);
console.log(weakset1.has(object1));
// Expected output: true

try {
  weakset1.add(1);
} catch (error) {
  console.log(error);
  // Expected output (Chrome): TypeError: Invalid value used in weak set
  // Expected output (Firefox): TypeError: WeakSet value must be an object, got 1
  // Expected output (Safari): TypeError: Attempted to add a non-object key to a WeakSet
}

Syntaxe

js
ws.add(valeur);

Paramètres

valeur

Ce paramètre est obligatoire. Il correspond à l'objet qu'on souhaite ajouter à l'ensemble WeakSet.

Valeur de retour

L'objet WeakSet.

Exemples

js
var ws = new WeakSet();

ws.add(window); // on ajouter l'objet window à l'objet WeakSet

ws.has(window); // tru

// WeakSet ne peut contenir que des objets
ws.add(1);
// TypeError: Invalid value used in weak set -> Chrome
// TypeError: 1 is not a non-null obect -> Firefox

Spécifications

Specification
ECMAScript® 2025 Language Specification
# sec-weakset.prototype.add

Compatibilité des navigateurs

Report problems with this compatibility data on GitHub
desktopmobileserver
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
add

Legend

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Full support
Full support

Voir aussi