In this Hasty Treat, Scott and Wes talk about TypeScript Fundamentals, including narrowing, discriminating unions, and type guards. Sentry - Sponsor If you want to know what’s happening with your code, track errors and monitor performance with Sentry. Sentry’s Application Monitoring platform helps developers see performance issues, fix errors faster, and optimize their code health. Cut your time on error resolution from hours to minutes. It works with any language and integrates with dozens of other services. Syntax listeners new to Sentry can get two months for free by visiting Sentry.io and using the coupon code TASTYTREAT during sign up. Payments Hub - Sponsor There are hundreds of payments processing companies out there. Hit up developer.paymentshub.com/syntax to learn more about how Payments Hub Developers not only processes ecommerce and in-person payments, but also boards and underwrites your merchants in as little as 90 minutes. We are currently offering Syntax listeners who become new partners 6 months free data through our Business Reporting API! Show Notes 00:24 Welcome 01:35 Sponsor: Sentry 02:23 Sponsor: Payments Hub 05:21 Intro to TypeScript fundamentals 06:28 What is Type Narrowing? 09:32 typeof 11:58 instanceof 13:29 Custom typeguards 16:12 this is 17:59 discriminated unions 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