TypeScript Fundamentals × Type Narrowing, Guards, and Predicates

Syntax - Tasty Web Development Treats

Wes Bos

Tech News, News, Technology

4.9 • 1.2K Ratings

🗓️ 2 January 2023

⏱️ 23 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

In this episode of Syntax, Wes and Scott talk through some TypeScript Fundamentals around type narrowing, type guards, and type predicates. Show Notes 00:24 Welcome 01:40 Rocking predicates 02:54 What is a type in TypeScript? 04:11 Type Narrowing 08:18 Type Guard 16:19 Type Predicates Shameless Plugs Scott: LevelUp Tutorials Wes: Wes Bos Tutorials Tweet us your tasty treats Scott’s Instagram LevelUpTutorials Instagram Wes’ Instagram Wes’ Twitter Wes’ Facebook Scott’s Twitter Make sure to include @SyntaxFM in your tweets

Transcript

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0:00.0	Monday! Monday! Monday! Open wide dev fans! Get ready! To stuff your face with
0:07.0	JavaScript CSS! Node modules! Barbecue tips! Get workflow! Break dancing! Soft skills!
0:12.0	Web development! The hastiest! The courageous! The tastiest! Web development
0:17.0	treats! Coming in hot! Here is Wes Barakuda! Boss! And Scott El Torro Lugo!
0:24.0	Tolinsky!
0:26.0	Well, come to syntax! On this Monday hasty treat, we're going to be talking about
0:34.0	TypeScript again. We love talking about TypeScript over here. We're going to be talking
0:38.0	about fundamentals in TypeScript, some lesser known, but important features,
0:42.0	things like type narrowing, guards, and predicates. With me, as always, is Wes the
0:50.0	Tony Hawk of TypeScript Boss. Hey, we've had a hell of a morning. We both had, like,
1:01.0	we both had, like, probably three independent issues with internet, audio, and
1:07.0	video streaming. Technical issues. I had a problem with my camera
1:12.0	and my audio, and Scott had a problem with his internet switch and his
1:18.0	video now, which is just- Yeah, now all of this out of my video is just died. After all of that,
1:22.0	we were just like, all right, we're good. We're good to go. And now my video has died.
1:27.0	So, well, I'll get that back online. You know what? It's time for Christmas holidays.
1:32.0	Yeah. I just got a notification from you that says, I'm going to restart my
1:35.0	routers, but that was 15 minutes ago. Something is going on with the internet today.
1:39.0	We are ready for Christmas, but this is one of the last ones we need to record.
1:44.0	And it's kind of an exciting one. It's about TypeScript fundamentals,
1:48.0	type narrowing, typeguards, and type predicates, which is funny.
1:52.0	The first time we tried to record this, Scott was like, I don't think I've ever
	...

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