The latest JavaScript specification standardizes a well-balanced and thoughtful set of features, including the built-in ...

The Map object in JavaScript provides several key methods for adding, retrieving and manipulating key-value pairs. The set() method is used to add or update a key-value pair in a Map.

The ECMAScript 2025 specification, now final, standardizes new JavaScript capabilities including JSON modules, regex capabilities, Set methods, and sync iterator helper methods.