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