Lesson 5 — Union types
One of many
A union type allows several types: string | number.
Task
Make id accept string or number and log it.
Keep going with TypeScript Foundations
Ready for more? These paid resources pick up where this lesson leaves off.
UdemyBestsellers
Top-rated TypeScript Foundations courses
Project-based TypeScript Foundations video courses — the perfect paid next step after these free lessons.
Browse on Udemy →AmazonReader picks
Best TypeScript Foundations books
Hand-picked TypeScript Foundations books to master the fundamentals offline.
See on Amazon →Some links on this page are affiliate links: we may earn a commission at no extra cost to you. We only recommend tools we believe are genuinely useful.