正在加载视频...

视频加载失败

加载此视频时出现问题。这可能是由于临时网络问题，或视频可能不可用。

⚛️ How to use TypeScript type predicates in React to create a more robust, type-safe, and maintainable component. (this pattern is particularly useful when dealing with discriminated unions or when you need to narrow types based on runtime checks)

George Moller

119,062 subscribers

29,508 次观看 • 1 年前 •via X (Twitter)

教育科学技术

Anya Rossi• Live Now

Private livecam show

5 条评论

George Moller 的头像

George Moller1 年前

I've been working professionally with React for more than 8 years and I compiled all my knowledge into 100+ infographics and 70+ video tutorials just like this one. Check them out ↓

Andre de Waard 的头像

Andre de Waard1 年前

We don’t need this since TS 5.5 right?

Prasenjit 的头像

Prasenjit1 年前

Thank you for the check, it's going to be useful.

Pavel Romanov 的头像

Pavel Romanov1 年前

Strange, I've just tested it in TS playground and stackblitz React playground and it narrows the type correctly (with the latest TS version). Maybe it is a problem of some older TS version or less strict TS complier config?

Davide Briano 的头像

Davide Briano1 年前

This is automatically narrowed with the latest TS version now 👌🏻

相关视频

⚛️ How to use discriminated unions in TypeScript to represent mutually exclusive states in React↓

⚛️ How to use discriminated unions in TypeScript to represent mutually exclusive states in React↓

George Moller

28,192 次观看 • 1 年前

⚛️ React + Typescript tip: Creating dynamic prop types for components with Discriminated Unions ↓

⚛️ React + Typescript tip: Creating dynamic prop types for components with Discriminated Unions ↓

George Moller

77,657 次观看 • 2 年前

⚛️ How to use conditional types in TypeScript and React ↓

⚛️ How to use conditional types in TypeScript and React ↓

George Moller

42,404 次观看 • 1 年前

⚛️ React + Typescript Tip: How to create short and easy to remember event types with Typescript ↓

⚛️ React + Typescript Tip: How to create short and easy to remember event types with Typescript ↓

George Moller

89,542 次观看 • 1 年前

⚛️ React + Typescript Tip: How to create short and easy to remember event types with Typescript ↓

⚛️ React + Typescript Tip: How to create short and easy to remember event types with Typescript ↓

George Moller

57,741 次观看 • 2 年前

⚛️ Use TypeScript utility types like Omit to create more reusable and adaptable components ↓

⚛️ Use TypeScript utility types like Omit to create more reusable and adaptable components ↓

George Moller

50,210 次观看 • 1 年前

I wrote a 2D game, entirely in type-level Typescript. Yes, you read that right. This is flappy bird, written only in Typescript types. How did I do it? It involves a lot of type magic, and a new type-level Typescript runtime I made in Rust + Zig. Let me walk you through it:

I wrote a 2D game, entirely in type-level Typescript. Yes, you read that right. This is flappy bird, written only in Typescript types. How did I do it? It involves a lot of type magic, and a new type-level Typescript runtime I made in Rust + Zig. Let me walk you through it:

zack

625,414 次观看 • 2 年前

Do you know about ReturnType in TypeScript? What about Awaited or Parameters? Utility types can unlock a lot of power to keep your code type safe, even when your npm packages aren't perfect More magic you can do with utility types in my latest article:

Do you know about ReturnType in TypeScript? What about Awaited or Parameters? Utility types can unlock a lot of power to keep your code type safe, even when your npm packages aren't perfect More magic you can do with utility types in my latest article:

Steve (Builder.io)

268,402 次观看 • 3 年前

Some VINTAGE TypeScript magic. Here's how to create a type-safe version of Object.assign, with an arbitrary number of objects.

Some VINTAGE TypeScript magic. Here's how to create a type-safe version of Object.assign, with an arbitrary number of objects.

Matt Pocock

38,013 次观看 • 1 年前

There are different types of OS, you need to know the type you’re dealing with 🙈

There are different types of OS, you need to know the type you’re dealing with 🙈

Minister For Ashawo

31,083 次观看 • 8 个月前

How to indicate a server component needs to be rendered dynamically at runtime, when it doesn't use dynamic APIs in Nextjs

How to indicate a server component needs to be rendered dynamically at runtime, when it doesn't use dynamic APIs in Nextjs

Alex Sidorenko

44,635 次观看 • 9 个月前

GraphQL to TypeScript type, no code gen. Written purely in TypeScript type. With Prisma-like query syntax fully type-safe. Should cover almost all of the GraphQL specs, now. Here's a demo.

GraphQL to TypeScript type, no code gen. Written purely in TypeScript type. With Prisma-like query syntax fully type-safe. Should cover almost all of the GraphQL specs, now. Here's a demo.

SaltyAom

100,697 次观看 • 2 年前

Everything in life follows a pattern. 🔃 When you recognize the pattern, fear disappears. When you learn to use the pattern, you gain power. When you create the pattern, you dominate. #UnleashthePowerWithin

Everything in life follows a pattern. 🔃 When you recognize the pattern, fear disappears. When you learn to use the pattern, you gain power. When you create the pattern, you dominate. #UnleashthePowerWithin

Tony Robbins

60,892 次观看 • 1 年前

Cline now uses Anthropic's new "Computer Use" feature to launch a browser, click, type, and scroll. This gives him more autonomy in runtime debugging, end-to-end testing, and even general web use!

Cline now uses Anthropic's new "Computer Use" feature to launch a browser, click, type, and scroll. This gives him more autonomy in runtime debugging, end-to-end testing, and even general web use!

Saoud Rizwan

66,247 次观看 • 1 年前

In TypeScript, interfaces and types are often interchangeable. But these are 6 features that only work with a type alias. Clip from "TypeScript: Getting Started" on Dometrain

In TypeScript, interfaces and types are often interchangeable. But these are 6 features that only work with a type alias. Clip from "TypeScript: Getting Started" on Dometrain

Cory House

56,130 次观看 • 1 年前

Sehun suddenly asked Yijin's blood type and Jongin said Sehun doesn't believe in MBTIs at all but is obsessed with blood types 😭 🐥: What is Yijin's blood type? 👤: *flustered*... why? 🧸: He's obsessed with blood types! He doesn't even believe in MBTIs, he believes in blood types! 👤: Which blood type do you think is the best? 🐥: Either type O or type A 🧸: Do you know why? Because he's type O, so he thinks type O is the best! 👤: Try guessing Yijin's blood type! 🐥: I asked because i think he's either type O or type A! 🧸🍼: *busy playing on their own* 🐥: *still trying to guess Yijin's blood type*

Sehun suddenly asked Yijin's blood type and Jongin said Sehun doesn't believe in MBTIs at all but is obsessed with blood types 😭 🐥: What is Yijin's blood type? 👤: flustered... why? 🧸: He's obsessed with blood types! He doesn't even believe in MBTIs, he believes in blood types! 👤: Which blood type do you think is the best? 🐥: Either type O or type A 🧸: Do you know why? Because he's type O, so he thinks type O is the best! 👤: Try guessing Yijin's blood type! 🐥: I asked because i think he's either type O or type A! 🧸🍼: busy playing on their own 🐥: still trying to guess Yijin's blood type

큥베리 | Grace 💫

34,464 次观看 • 7 个月前

Today we’re excited to introduce GenSX, an open source TypeScript framework for building backend workflows and agents with reusable, React-like components. If you know how to write a React component, then you’ll feel right at home building agents in GenSX.

Today we’re excited to introduce GenSX, an open source TypeScript framework for building backend workflows and agents with reusable, React-like components. If you know how to write a React component, then you’ll feel right at home building agents in GenSX.

Evan Boyle

14,446 次观看 • 1 年前

Stop grouping your Unity Addressables by asset type! 🛑 For peak performance, organize your assets based on when they’re needed at runtime. In this quick tip, you’ll learn how to optimize your asset management workflow. 🔗 Watch the full tutorial:

Stop grouping your Unity Addressables by asset type! 🛑 For peak performance, organize your assets based on when they’re needed at runtime. In this quick tip, you’ll learn how to optimize your asset management workflow. 🔗 Watch the full tutorial:

Unity for Games

15,712 次观看 • 7 天前

How to use SketchUp to create a stone railing along a curved balcony. I hope this tutorial is useful and helpful for you

How to use SketchUp to create a stone railing along a curved balcony. I hope this tutorial is useful and helpful for you

Qiandra

17,049 次观看 • 9 个月前

⚛️ How to keep you imports tidy and clean in React ↓

⚛️ How to keep you imports tidy and clean in React ↓

George Moller

43,401 次观看 • 2 年前