javascript instance method

Map.prototype.clear()

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

Interactive exampleOpen the canonical MDN source to run this embedded demo.

const map = new Map();

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

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

map.clear();

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

Syntax

clear()

Parameters

None.

Return value

None (undefined).

Examples

Using clear()

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

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.