The Two Reacts — overreacted
Suppose I want to display something on your screen. Whether I want to display a web page like this blog post, an interactive web app, or even a native app that you might download from some app store, at least two devices must be involved. Your device and mine. It starts with some code and data on my device. For example, I am editing this blog post as a file on my laptop. If you see it on your scre
npm audit: Broken by Design — overreacted
Security is important. Nobody wants to be the person advocating for less security. So nobody wants to say it. But somebody has to say it. So I guess I’ll say it. The way npm audit works is broken. Its rollout as a default after every npm install was rushed, inconsiderate, and inadequate for the front-end tooling. Have you heard the story about the boy who cried wolf? Spoiler alert: the wolf eats t
Why Do React Hooks Rely on Call Order? - Overreacted
Why Do React Hooks Rely on Call Order?December 13, 2018 At React Conf 2018, the React team presented the Hooks proposal. If you’d like to understand what Hooks are and what problems they solve, check out our talks introducing them and my follow-up article addressing common misconceptions. Chances are you won’t like Hooks at first: They’re like a music record that grows on you only after a few good
Before You memo() — overreacted
There are many articles written about React performance optimizations. In general, if some state update is slow, you need to: Verify you’re running a production build. (Development builds are intentionally slower, in extreme cases even by an order of magnitude.) Verify that you didn’t put the state higher in the tree than necessary. (For example, putting input state in a centralized store might no
A Complete Guide to useEffect — overreacted
You wrote a few components with Hooks. Maybe even a small app. You’re mostly satisfied. You’re comfortable with the API and picked up a few tricks along the way. You even made some custom Hooks to extract repetitive logic (300 lines gone!) and showed it off to your colleagues. “Great job”, they said. But sometimes when you useEffect, the pieces don’t quite fit together. You have a nagging feeling
My Decade in Review — overreacted
I started this decade as a first-year college student fresh out of high school. I was 17, didn’t have a job, didn’t have any industry connections, and really didn’t know shit. And now you’re reading my blog! I would have been proud. I’ve told bits and pieces of my story on different podcasts. Now feels like an appropriate time to write down the parts that were most memorable to me. Every person’s
useEffect完全ガイド
あなたは Hooks を使って複数のコンポーネントを書きました。ちょっとしたアプリも作ったことがあるでしょう。満足もしている。API にも慣れて、その過程でコツも掴んできました。しかも重複したロジックを転用できるよう Custom Hooks を作り、同僚に自慢して見たり。 でも useEffect を使う度、いまいちピンときません。class のライフサイクルとは似ているけど、何かが違う。そしていろんな疑問を抱き始めます。 🤔 componentDidMount を useEffect で再現する方法は？ 🤔 useEffect 内で正確に非同期処理を行う方法とは？ []ってなに？ 🤔 関数をエフェクトの依存関係として記すべき？ 🤔 非同期処理の無限ループがたまに起こるのはなぜ？ 🤔 古い state か props がエフェクト内にたまに入るのはなぜ？ 私も Hooks を使
How Does the Development Mode Work? — overreacted
How Does the Development Mode Work?August 4, 2019 If your JavaScript codebase is even moderately complex, you probably have a way to bundle and run different code in development and production. Bundling and running different code in development and production is powerful. In development mode, React includes many warnings that help you find problems before they lead to bugs. However, the code neces
How Are Function Components Different from Classes? — overreacted
How Are Function Components Different from Classes?March 3, 2019 How do React function components differ from React classes? For a while, the canonical answer has been that classes provide access to more features (like state). With Hooks, that’s not true anymore. Maybe you’ve heard one of them is better for performance. Which one? Many of such benchmarks are flawed so I’d be careful drawing conclu
React as a UI Runtime — overreacted
Most tutorials introduce React as a UI library. This makes sense because React is a UI library. That’s literally what the tagline says! I’ve written about the challenges of creating user interfaces before. But this post talks about React in a different way — more as a programming runtime. This post won’t teach you anything about creating user interfaces. But it might help you understand the React
Why Isn’t X a Hook? — overreacted
Since the first alpha version of React Hooks was released, there is a question that keeps coming up in discussions: “Why isn’t <some other API> a Hook?” To remind you, here’s a few things that are Hooks: useState() lets you declare a state variable. useEffect() lets you declare a side effect. useContext() lets you read some context. But there are some other APIs, like React.memo() and <Context.Pro
2018年の段階で私が知らないこと
Originally written in: English • Русский (авторский перевод) Translated by readers into: Deutsch • Español • Français • Português do Brasil • Svenska • Tiếng Việt • తెలుగు • 日本語 • 简体中文 • 繁體中文 • 한국어 Read the original • Improve this translation • View all translated posts 多くの人は、私が実際に持っている知識量より遥かに多くのことを知っていると思い込んでいる。それは悪い事ではないので文句を言っているわけではない。(世の少数派の人達は、努力して資格を得ているにもかかわらず、逆の偏見に苦しめられている。それはイケてない。) この記
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Reactはどうやって関数からクラスを見分けるているの？