JavaScript .set()

Stores or updates entries of key-value pairs in a Map object.

Syntax

The .set() method accepts two parameters, the key and the value, and assigns the entry to a Map object:

const map = new Map();

map.set(key, value);

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The key and value can either be an object or a variable of any data type.

Example

Key-value pairs are stored in a Map object using the .set() method.

const fruits = new Map();
fruits.set('Apples', 5);
fruits.set('Oranges', 8);

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The example above uses .set() to store two entries in the fruits map: one for 5 apples and another for 8 oranges. These entries can be overwritten and have their values changed with .set() as well:

fruits.set('Apples', 2);
console.log(fruits);

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The output will be:

Map(2) { 'Apples' => 2, 'Oranges' => 8 }

Chaining

Instead of executing separate calls to .set() for the same Map object, multiple .set()s can be “chained” together:

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Codebyte Example

Run the example below to understand better the usage of the .set() method:

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