Map.prototype.set()

The set() method adds or updates an element with a specified key and a value to a Map object.

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Syntax

set(key, value)

Parameters

key

The key of the element to add to the Map object. The key may be any JavaScript type (any primitive value or any type of JavaScript object).

value

The value of the element to add to the Map object. The value may be any JavaScript type (any primitive value or any type of JavaScript object).

Return value

The Map object.

Examples

Using set()

let 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:

// Add new elements to the map with chaining.
myMap.set('bar', 'foo')
     .set(1, 'foobar')
     .set(2, 'baz');

Specifications

Specification
ECMAScript Language Specification
# sec-map.prototype.set

Browser compatibility

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See also