Free
Course

Learn TypeScript: Functions

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

4.67 out of 5 stars
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1,367 learners enrolled

  • Skill level

    Beginner

  • Time to complete

    Approx. 1 hour

  • Certificate of completion

    Included with paid plans

  • Prerequisites

    None

About this course

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.

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Don’t just watch or read about someone else coding — write your own code live in our online, interactive platform. You’ll even get AI-driven recommendations on what you need to review to help keep you on track.
Animated demonstration of running code in Codecademy's learning environment

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Meet the creator of the course
Meet the full team
Kenny Lin
Web Development Domain Manager at Codecademy
Kenny is the Domain Manager for the Web Development Domain at Codecademy. He contributed to a wide range of courses and paths at Codecademy, including JavaScript, Bootstrap, Handlebars, Phaser.js, Go, Swift, TypeScript, and Lua.
Meet the full team

Learn TypeScript: Functions course ratings and reviews

4.67 out of 5 stars
64 ratings
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  • The progress I have made since starting to use codecademy is immense! I can study for short periods or long periods at my own convenience - mostly late in the evenings.
    Chris
    Codecademy Learner @ USA
  • I felt like I learned months in a week. I love how Codecademy uses learning by practice and gives great challenges to help the learner to understand a new concept and subject.
    Rodrigo
    Codecademy Learner @ UK
  • Brilliant learning experience. Very interactive. Literally a game changer if you're learning on your own.
    John-Andrew
    Codecademy Learner @ USA

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