Functional programming with arrays Although JavaScript’s arrays are very capable out of the box, the functional paradigm improves the clarity and maintainability of array code.

When it comes to making modifications to objects and arrays, adding or changing keys to objects can be a cumbersome task. But with the spread operator (…), you have a simple way of doing it.

This tutorial provides a comprehensive guide to JavaScript Map and Set, explaining their differences, use cases, and how to use them.