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---
title: Map.prototype.set()
slug: Web/JavaScript/Reference/Global_Objects/Map/set
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.set
---
{{JSRef}}
The **`set()`** method of {{jsxref("Map")}} instances adds or updates an entry in this map with a specified key and a value.
{{EmbedInteractiveExample("pages/js/map-prototype-set.html")}}
## Syntax
```js-nolint
set(key, value)
```
### Parameters
- `key`
- : The key of the element to add to the `Map` object. The key may be any [JavaScript type](/en-US/docs/Web/JavaScript/Data_structures) (any [primitive value](/en-US/docs/Web/JavaScript/Data_structures#primitive_values) or any type of [JavaScript object](/en-US/docs/Web/JavaScript/Data_structures#objects)).
- `value`
- : The value of the element to add to the `Map` object. The value may be any [JavaScript type](/en-US/docs/Web/JavaScript/Data_structures) (any [primitive value](/en-US/docs/Web/JavaScript/Data_structures#primitive_values) or any type of [JavaScript object](/en-US/docs/Web/JavaScript/Data_structures#objects)).
### 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
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{jsxref("Map")}}
- {{jsxref("Map.prototype.get()")}}
- {{jsxref("Map.prototype.has()")}}