files/en-us/web/javascript/reference/global_objects/map/clear/index.md

metadata

title: Map.prototype.clear()
short-title: clear()
slug: Web/JavaScript/Reference/Global_Objects/Map/clear
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.clear
sidebar: jsref

The clear() method of {{jsxref("Map")}} instances removes all elements from this map.

{{InteractiveExample("JavaScript Demo: Map.prototype.clear()")}}

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 ({{jsxref("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

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{jsxref("Map")}}