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Map.prototype.delete()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

The delete() method of Map instances removes the entry specified by the key from this Map.

Try it

const map = new Map();
map.set("bar", "foo");

console.log(map.delete("bar"));
// Expected result: true
// True indicates successful removal

console.log(map.has("bar"));
// Expected result: false

Syntax

mapInstance.delete(key)

Parameters

key: The key of the entry to remove from the Map object. Object keys are compared by reference, not by value.

Return value

true if an entry in the Map object has been removed successfully. false if the key is not found in the Map.

Examples

Using delete()

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

console.log(myMap.delete("bar")); // Returns true. Successfully removed.
console.log(myMap.has("bar")); // Returns false. The "bar" element is no longer present.

Specifications

Specification
ECMAScript® 2026 Language Specification> # sec-map.prototype.delete>

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`delete`	38	12	13	25	8	38	14	25	8	3.0	38	8	1.0.0	1.0	0.12.0