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George Moller

@_georgemoller • 118,936 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.

373,193 просмотров

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

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

459,671 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.

170,057 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 👇

162,600 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

133,848 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.

101,479 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

⚛️ 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

⚛️ 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.

64,825 просмотров

⚛️ State relocation is one of the simplest ways to avoid expensive components from being unnecesary rendered ↓

⚛️ State relocation is one of the simplest ways to avoid expensive components from being unnecesary rendered ↓

39,935 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. ↓

38,567 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 ↓

161,296 просмотров • 4 месяцев назад

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

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

123,451 просмотров • 4 месяцев 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.

73,981 просмотров • 4 месяцев 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 • 4 месяцев назад

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

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

342,274 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.

206,841 просмотров • 1 год назад

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

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

50,727 просмотров • 4 месяцев 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

57,237 просмотров • 4 месяцев назад

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

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

152,253 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.

177,627 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.

256,599 просмотров • 2 лет 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.

214,951 просмотров • 2 лет 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.

185,781 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.

177,601 просмотров • 2 лет назад

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

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

93,875 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 ↓

89,528 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

⚛️ Keep UI responsive during expensive renders with useTransition(): React prioritizes user input over transitions ↓

⚛️ Keep UI responsive during expensive renders with useTransition(): React prioritizes user input over transitions ↓

30,325 просмотров • 4 месяцев назад

⚛️ If you want cleaner event handlers in your jsx in React you can use currying ↓

⚛️ If you want cleaner event handlers in your jsx in React you can use currying ↓

142,607 просмотров • 2 лет назад