Map.prototype.get()
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.
Theget() method ofMap instances returns the value corresponding to the key in thisMap, orundefined if there is none. Object values are returned as the same reference that was originally stored, not as a copy, so mutations to the returned object will be reflected anywhere that reference is held, including inside theMap.
Try it
const map = new Map();map.set("bar", "foo");console.log(map.get("bar"));// Expected output: "foo"console.log(map.get("baz"));// Expected output: undefinedSyntax
js
get(key)Parameters
Return value
The value associated with the specified key in theMap object. If the key can't be found,undefined is returned.
Examples
Using get()
js
const myMap = new Map();myMap.set("bar", "foo");console.log(myMap.get("bar")); // Returns "foo"console.log(myMap.get("baz")); // Returns undefinedUsing get() to retrieve a reference to an object
js
const arr = [];const myMap = new Map();myMap.set("bar", arr);myMap.get("bar").push("foo");console.log(arr); // ["foo"]console.log(myMap.get("bar")); // ["foo"]Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-map.prototype.get |