TypeScript Functions Tutorial: How to Type Everything (2026)

In this video, we break down exactly how TypeScript functions work. We start with the basics: What is a function in TypeScript? Then, we move into the professional way to implement parameter types and explicit return types to ensure your code is bug-free and easy to maintain.

Many developers forget to type their returns, but in 2026, type safety is the standard for professional web development. Whether you're working with arrow functions or traditional declarations, knowing how to handle void, never, and custom interfaces is a must-have skill.

What you will learn in this video:

Defining Function Parameters: How to assign types to inputs like strings, numbers, and objects.

Implementing Return Types: Why you should always define what your function sends back.

The Power of Type Inference: When TypeScript does the work for you and when it doesn't.

Common Mistakes: Avoid using 'any' and learn to use specific types for better IDE support.

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