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Showing content from https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/Set/clear below:

Set.prototype.clear() - JavaScript | MDN

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La méthode clear() permet de retirer tous les éléments d'un ensemble Set.

const set1 = new Set();
set1.add(1);
set1.add("foo");

console.log(set1.size);
// Expected output: 2

set1.clear();

console.log(set1.size);
// Expected output: 0

undefined.

var monSet = new Set();
monSet.add(1);
monSet.add("toto");

monSet.size; // 2
monSet.has("toto"); // true

monSet.clear();

monSet.size; // 0
monSet.has("truc"); // false

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