Typescript

How I discovered a cool little tip on creating string literal union types from dictionaries, and why it matters.by Gail Johnson * Feb. 09, 2026

Why do we need method overloading when we can create a general method signature using union parameter types? Let's find out.by Robert Banning * Oct. 01, 2024

At first, this will seem an easy challenge as part one can be accomplished with basic Javascript functionality. Part two provides you with the opportunity to demonstrate your knowledge of accessing property on an unknown object.by Gail Johnson * Aug. 21, 2024

Challenge to analyze a bowl of jelly beans to determine the frequency of each color bean. Difficulty: mediumby Robert Banning * Jul. 23, 2024

The spread operator can give you a clone (copy) of an object, but its properties still point to the same objects. How do you create a complete true clone of an object such that no properties point to original properties? Difficulty: mediumby Wiggy * Jul. 17, 2024

Function overloading allows functions to share the same name but have different signatures (parameters) and implementations. Understanding function overloading is an essential skill in your TS toolbelt. by Robert Banning * Jun. 04, 2024

Learn why you can't extend interfaces or intersect object types with common properties in Typescript; and how you can work around this.by Robert Banning * Mar. 08, 2024

In this challenge, you will level the playing ground giving Set the ability to reduce.by Gail Johnson * Jan. 16, 2024

I was sure this wasn't possible! Here is how you can use one function parameter as the default for another parameter. Follow up with a challenge. Difficulty: easyby Wiggy * Sep. 18, 2023

Today, we explore a way to create Typescript types that are based on some condition. We often (usually) use `extends` to create ternary expressions allowing us to build conditional types.by Robert Banning * Mar. 17, 2023

Are you new to Typescript? This mini-introduction will get you started and hopefully spark interest in exploring more about Typescript.by Robert Banning * Feb. 28, 2023