Learn TypeScript: Functions

Write functions in TypeScript to declare expected types of function parameters and return values.

Continue your TypeScript learning journey with Learn TypeScript: Functions. In addition to variable types, TypeScript allows you to declare the expected types of your function parameters and infer the types returned by those functions.



### Skills you’ll gain
* Apply type annotations to function parameters.
* Understand how TypeScript determins the return type of a function.
* Explicitly specify return types for functions.

### Notes on prerequisites
We recommend that you complete [Learn TypeScript: Fundamentals](https://www.codecademy.com/learn/learn-typescript-fundamentals) before starting this course.

• Functions: Learn about writing functions in Typescript
• Lesson: Functions
• Quiz: Functions
• Project: Pixel Smile
• Informational: Next Steps