Map.prototype.set() - JavaScript | MDN
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: undefined
Syntax
Parameters
Return value
The Map object.
Examples
Using set()
js
const myMap = new Map();
// Add new elements to the map
myMap.set("bar", "foo");
myMap.set(1, "foobar");
// Update an element in the map
myMap.set("bar", "baz");
Using the set() with chaining
Since the set() method returns back the same Map object, you can chain the method call like below:
js
// Add new elements to the map with chaining.
myMap.set("bar", "foo").set(1, "foobar").set(2, "baz");
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-map.prototype.set |