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Remember the first step revealed several errors when converting to TypeScript because "strict typing" was turned on? In this step ...

No new features are introduced in this segment. A simple function is added to make debug messages cleaner to write and the ...

This series will explore TypeScript for JavaScript developers by taking a JavaScript app and transforming it piece by piece. In this ...

In this video, Jeremy shows how to use a modern JavaScript feature for building strings known as "string interopolation.

In this last step, learn how TypeScript helps you prepare for future versions of JavaScript by keeping pace with the latest specs.

Part 13 introduced a defect caused by passing a property name with improper case. In this step, a "key type" is introduced that ...

A bug has surfaced due to the way variables are captured in scope in JavaScript. Rather than wrap the call in additional code that ...

This episode features a small refactoring that enables the printing functionality to show labels along with values by passing the ...

A JavaScript file was renamed to TypeScript and has errors. Learn how to suppress the errors by changing the configuration to ...

Learn about support for generic types in TypeScript. The existing code has a "find" method that isn't running properly. In this video ...

In this video, I fix a defect revealed by refactoring to classes. I then use a custom type to define the allowable values of a property.

In this short clip, a custom type is defined using generics to define a "predicate" or a simple method that takes an item of a certain ...

A few function constructors are refactored to classes and properties are tagged with types. This one step reveals yet another ...

Type guards allow code to test that a variable is of a specific type. If the test succeeds, TypeScript's compiler understands the ...

This step extends the interfaces that were defined and uses them to create a generic method for recursive printing. The code is ...

Interfaces specify signatures that classes must follow. Unlike other languages, interfaces in TypeScript aren't unique types on their ...

Wondering how AI and new language features are changing web development forever! ✨ Get ready for a deep dive into the ...

Learn how to use lambda expressions in TypeScript so you never have to worry about what "this" is again. Learn more about "this" ...

Type decorators are one of my favorite aspects of TypeScript. They enable aspect-oriented development by allowing the ...

Update: This video shows a really old version of Forest. Almost everything is different now. The latest version is described on ...