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George Moller

@_georgemoller • 118,562 subscribers

Staff Front End Engineer @shopify. Learning, building, and sharing my journey.

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❌ Avoid Provider wrapping hell in React. ✅ Instead combine all your Providers using composition.

❌ Avoid Provider wrapping hell in React. ✅ Instead combine all your Providers using composition.

373,312 просмотров

❌ Avoid using conditionals to render views in React ✅ Instead use Enums

❌ Avoid using conditionals to render views in React ✅ Instead use Enums

460,509 просмотров

❌ Avoid Provider wrapping hell in React. ✅ Instead combine all your Providers using composition.

❌ Avoid Provider wrapping hell in React. ✅ Instead combine all your Providers using composition.

170,096 просмотров

📣 Quick announcement: I put together an ebook with 30+ questions and answers to help you ace your next React interview (from beginner to advanced). Just comment on this tweet and I'll send it over 👇

📣 Quick announcement: I put together an ebook with 30+ questions and answers to help you ace your next React interview (from beginner to advanced). Just comment on this tweet and I'll send it over 👇

162,620 просмотров

❌ Prevent performance issues when showing large lists of data. ✅ Instead use Virtualization, only display what the user sees at any given time

❌ Prevent performance issues when showing large lists of data. ✅ Instead use Virtualization, only display what the user sees at any given time

133,849 просмотров

❌ Avoid resetting state when prop changes in an effect. ✅ Instead, use the key prop to tell react what makes the component reset its state.

❌ Avoid resetting state when prop changes in an effect. ✅ Instead, use the key prop to tell react what makes the component reset its state.

101,481 просмотров

🚫 𝗔𝘃𝗼𝗶𝗱 Using a full context value in every component can trigger unnecessary re-renders. ✅ 𝗜𝗻𝘀𝘁𝗲𝗮𝗱 Use 𝘤𝘰𝘯𝘵𝘦𝘹𝘵 𝘴𝘦𝘭𝘦𝘤𝘵𝘰𝘳𝘴 to pull only the data you need. This reduces re-renders and improves performance.

🚫 𝗔𝘃𝗼𝗶𝗱 Using a full context value in every component can trigger unnecessary re-renders. ✅ 𝗜𝗻𝘀𝘁𝗲𝗮𝗱 Use 𝘤𝘰𝘯𝘵𝘦𝘹𝘵 𝘴𝘦𝘭𝘦𝘤𝘵𝘰𝘳𝘴 to pull only the data you need. This reduces re-renders and improves performance.

52,973 просмотров

🧪 React testing tip: Avoid performing side effects in waitFor. Instead put side effects outside waitFor callbacks and use the callback for assertions only.

🧪 React testing tip: Avoid performing side effects in waitFor. Instead put side effects outside waitFor callbacks and use the callback for assertions only.

80,161 просмотров

⚛️ In React, rendering large lists or tables can be a drag on performance. The fix? Virtualization! the process of only rendering part of that large data set (just enough to fill the viewport). ✅ Improves rendering time significantly. ✅ Lowers memory consumption.

⚛️ In React, rendering large lists or tables can be a drag on performance. The fix? Virtualization! the process of only rendering part of that large data set (just enough to fill the viewport). ✅ Improves rendering time significantly. ✅ Lowers memory consumption.

55,288 просмотров

⚛️ React TIp: reuse logic by using custom hooks to attach event listeners ↓

⚛️ React TIp: reuse logic by using custom hooks to attach event listeners ↓

73,787 просмотров

⚛️ useEffect cheatsheet ↓ ❌ Thinking of useEffect as a lifecycle method. ✅ Thinking of useEffect as a mechanism to sync data (state/props) with systems that aren’t controlled by React.

⚛️ useEffect cheatsheet ↓ ❌ Thinking of useEffect as a lifecycle method. ✅ Thinking of useEffect as a mechanism to sync data (state/props) with systems that aren’t controlled by React.

64,827 просмотров

⚛️ I don't worry too much about re-renders in React. (unless I see performance issues) However, I do care about understanding how the rendering process works. ↓

⚛️ I don't worry too much about re-renders in React. (unless I see performance issues) However, I do care about understanding how the rendering process works. ↓

38,597 просмотров

⚛️ A common useEffect mistake I often see people make: ❌ Don't put event's logic in useEffect. ✅ Instead put it right in the event handler ↓

⚛️ A common useEffect mistake I often see people make: ❌ Don't put event's logic in useEffect. ✅ Instead put it right in the event handler ↓

32,067 просмотров

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❌ Don't use barrel imports in React ✅ Import components directly Barrel imports (index.js re-exports) import the entire module even if you need one component. This adds unused code to your bundle ↓

❌ Don't use barrel imports in React ✅ Import components directly Barrel imports (index.js re-exports) import the entire module even if you need one component. This adds unused code to your bundle ↓

161,415 просмотров • 5 месяцев назад

❌ Rendering 10,000 items at once ✅ Rendering only what's visible

❌ Rendering 10,000 items at once ✅ Rendering only what's visible

123,862 просмотров • 5 месяцев назад

⚛️ How to structure and organize a React application ( ) ↓

⚛️ How to structure and organize a React application ( ) ↓

342,359 просмотров • 2 лет назад

❌ Avoid deeply nested validations that are hard to read. ✅ Instead use invariants.

❌ Avoid deeply nested validations that are hard to read. ✅ Instead use invariants.

206,926 просмотров • 1 год назад

❌ Conditional rendering loses form state in React. ✅ React 19's Activity API preserves it. e.g. Switch between steps → your data stays. Effects cleanup automatically → no wasted resources.

❌ Conditional rendering loses form state in React. ✅ React 19's Activity API preserves it. e.g. Switch between steps → your data stays. Effects cleanup automatically → no wasted resources.

74,081 просмотров • 6 месяцев назад

❌ Avoid difficult-to-read conditionals to render elements in react. ✅ Instead use utility components for conditional rendering.

❌ Avoid difficult-to-read conditionals to render elements in react. ✅ Instead use utility components for conditional rendering.

301,111 просмотров • 2 лет назад

❌ useMemo, useCallback, memo everywhere ✅ React Compiler handles it automatically React Compiler v1.0 is here. It analyzes your code at build time and adds memoization where needed.↓

❌ useMemo, useCallback, memo everywhere ✅ React Compiler handles it automatically React Compiler v1.0 is here. It analyzes your code at build time and adds memoization where needed.↓

62,751 просмотров • 5 месяцев назад

❌ Avoid multiple state variables to track status. ✅ Instead use enums.

❌ Avoid multiple state variables to track status. ✅ Instead use enums.

152,396 просмотров • 1 год назад

❌ Avoid having components with too many props. ✅ Instead use the compound components pattern in React to embrace composition.

❌ Avoid having components with too many props. ✅ Instead use the compound components pattern in React to embrace composition.

177,645 просмотров • 1 год назад

❌ Avoid Provider wrapping hell in React. ✅ Instead combine all your Providers using composition.

❌ Avoid Provider wrapping hell in React. ✅ Instead combine all your Providers using composition.

256,612 просмотров • 2 лет назад

❌ Don't disable ESLint warnings in useEffect ✅ Instead use useEffectEvent from React 19.2

❌ Don't disable ESLint warnings in useEffect ✅ Instead use useEffectEvent from React 19.2

57,445 просмотров • 6 месяцев назад

❌ Avoid prop-drilling your components to extend them ✅ Instead use composition

❌ Avoid prop-drilling your components to extend them ✅ Instead use composition

51,286 просмотров • 5 месяцев назад

❌ Avoid mixing business logic with your React components. ✅ Instead create abstraction layers that communicate with them.

❌ Avoid mixing business logic with your React components. ✅ Instead create abstraction layers that communicate with them.

214,959 просмотров • 2 лет назад

⚛️ How to structure a React project that scales: app/ → pages/ → features/ → shared/

⚛️ How to structure a React project that scales: app/ → pages/ → features/ → shared/

43,102 просмотров • 5 месяцев назад

❌ Avoid difficult-to-read conditionals in React. ✅ Instead you can use ts-pattern to express complex conditions in a single, compact expression.

❌ Avoid difficult-to-read conditionals in React. ✅ Instead you can use ts-pattern to express complex conditions in a single, compact expression.

185,805 просмотров • 2 лет назад

❌ Avoid increasing time complexity by having non-normalized state variables in React . ✅ Instead normalize the structure of the state variables to reduce time complexity.

❌ Avoid increasing time complexity by having non-normalized state variables in React . ✅ Instead normalize the structure of the state variables to reduce time complexity.

177,611 просмотров • 2 лет назад

⚛️ Use callback ref functions instead of useEffect (when possible) ↓

⚛️ Use callback ref functions instead of useEffect (when possible) ↓

94,079 просмотров • 1 год назад

⚛️ 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 ↓

89,542 просмотров • 1 год назад

⚛️ If you are using fetch() in a useEffect, you probably want to watch this short video ↓

⚛️ If you are using fetch() in a useEffect, you probably want to watch this short video ↓

88,624 просмотров • 1 год назад