React - masuyama's notes

React

React doesn’t have opinions on how you put files into folders.

If you’re just starting a project, don’t spend more than five minutes on choosing a file structure.

code:js

useEffect(() => {}) // Runs after every re-render

useEffect(() => {}, []) // Runs only on mount

useEffect(() => {}, value) // Runs on mount + when value changes

const color, setColor = useState("red");

code:js

// 親コンポーネント

// Child コンポーネントに、itemName という名前で item を渡す

code:js

// 子コンポーネント

// props.itemName で参照できる

npm create vite@latest my-react-app -- --template react