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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear below:

Map.prototype.clear() - JavaScript | MDN

Baseline Widely available

The clear() method of Map instances removes all elements from this 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

None.

None (undefined).

const myMap = new Map();
myMap.set("bar", "baz");
myMap.set(1, "foo");

console.log(myMap.size); // 2
console.log(myMap.has("bar")); // true

myMap.clear();

console.log(myMap.size); // 0
console.log(myMap.has("bar")); // false

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