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Symbol.prototype.toString() - JavaScript | MDN
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Symbol.prototype.toString()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since septembre 2015.
La méthode toString() renvoie une chaîne de caractères représentant l'objet Symbol.
Exemple interactif
console.log(Symbol("desc").toString());
// Expected output: "Symbol(desc)"
console.log(Symbol.iterator.toString());
// Expected output: "Symbol(Symbol.iterator)
console.log(Symbol.for("foo").toString());
// Expected output: "Symbol(foo)"
// console.log(Symbol('foo') + 'bar');
// Expected output: Error: Can't convert symbol to string
Syntaxe
js
Symbol().toString();
Valeur de retour
Une chaîne de caractères qui représente l'objet Symbol.
Description
L'objet Symbol surcharge la méthode toString() d'Object et n'hérite pas de Object.prototype.toString(). Pour les objets Symbol, la méthode toString() renvoie représentation de l'objet sous forme d'une chaîne de caractères.
Concaténation de chaînes et symboles
Bien qu'il soit possible d'appeler toString() pour les symboles, il n'est pas possible de concaténer une chaîne de caractères avec ce type d'objet :
js
Symbol("toto") + "machin"; // TypeError : Impossible de convertir un symbole en chaîne de caractères
Exemples
js
Symbol("desc").toString(); // "Symbol(desc)"
// symboles connus
Symbol.iterator.toString(); // "Symbol(Symbol.iterator)
// symboles globaux
Symbol.for("toto").toString(); // "Symbol(toto)"
Spécifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-symbol.prototype.tostring |
Compatibilité des navigateurs
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