Custom hooks

Where to use With custom Hooks, component logic can be extracted into reusable functions. React Hooks means that components should be written as pure functions as much as possible. If external funct

Front-endReact

2022-06-18

useEffect

useEffect() side effects Pure functions can only perform data calculations. Where should operations that do not involve calculations (such as generating logs, storing data, changing application stat

Front-endReact

2022-06-16

useState

Basic usage 1const [count, setCount] = useState(initialState) count is to read state, setCount is to update state, and initialState is initial value. State is an array Because React renderin

Posts

Traverse objects and arrays

Traverse the object: for…in loops through the object’s own and inherited enumerable properties Loops through the object’s own and inherited enumerable

Promise Advanced

Promise.all() and Promise.allSettled() Promise.all and Promise.allSettled are both methods for handling multiple concurrent Promises, but they differ

Promise basic

Promise: A new solution for asynchronous programming introduced in ES6. Promises are mainly to solve the previous problem of callback hell. Promise is

Rerender jest-axe

render() rerender is used to simulate props changing. How to get rerender(): 1const {rerender} = render(<FavoriteNumber />); rerender(

Jest test methods

Format expect(A).ValidateItem() is used in React testing library and Jest to verify functionality. Expect() Assertion Summary 1 [Expect() Assertion Su

Derek Zhu

Tag: Hooks

Custom hooks

useEffect

useState