Don't Ever Write Such Code. Do This Instead (Migrating from JavaScript to TypeScript)

In this concise 5-minute journey, we transform a piece of JavaScript code—crafted initially 5 years ago—into a modern TypeScript marvel. Step by step, we'll guide you through the migration process, highlighting the transformative power of TypeScript features such as interfaces and the 'extends' keyword.

This video is more than just a tutorial; it's your gateway to mastering TypeScript, a tool that empowers developers to write more reliable and maintainable code.

If you're eager to harness the full potential of TypeScript in your projects, don't miss our unique feature on the Jams for Devs Platform.

Dive into our "TypeScript Essentials" Jam, designed to kickstart your journey towards crafting safer, more robust JavaScript applications.

Join us, and let's code smarter, not harder!

[ahmettek]

I use both of them very little but I am confused why wouldn't it return f() when it is map? This makes me think TS is to make things more obscured in reading while it may be less lines.

[vasaniyakush]

One thing to note is that, if you're not checking map, fold and chain at multiple places, the interface is completely unnecessary and could be avoided.