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

Map.prototype.clear() - JavaScript | MDN

Baseline Widely available

La méthode clear() supprime tous les éléments d'un objet Map.

const map1 = new Map();

map1.set("bar", "baz");
map1.set(1, "foo");

console.log(map1.size);
// Expected output: 2

map1.clear();

console.log(map1.size);
// Expected output: 0

undefined.

var maMap = new Map();
maMap.set("truc", "bidule");
maMap.set(1, "toto");

maMap.size; // 2
maMap.has("truc"); // true

maMap.clear();

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

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