React – How to queue a series of State Updates?
https://react.dev/learn/queueing-a-series-of-state-updates What is “queue the next render”? What is the result of this code when you click on the button once? It’s not 3 but […]
React JS
React Native – Testing (3)
How to fix “Received number of calls: 0” when testing a class method? Ref: inner-functions-with-jest How to mock a class to return a function instead […]
Node – How to manage packages?
How to view the detail of a package? How to check why a package exists in the project? How to set a registry for npm/ […]
ReactJS – How to improve performance (1)
How to use useCallback? Use useCallback to save a function unless dependencies are changed By using useCallback, you can prevent unnecessarily re-rendering components by returning […]
React – How to use Hooks (2)?
useRef How to persist values between renders? Use useref How to store an array of elements using useRef? Problem: I could not simply assign my […]
Web navigation
Basic Is it possible to have multiple “#” in a url? which is the same window.location.hash for How to use “react-router”? How to create a […]
ReactJS – How to create a select box?
Use react-select
ReactJS – How to create a popup modal?
Use react-modal
ReactJS – How to validate a form?
Use react-hook-form Basic Install Usage Create form elements with unique name props Add handleSubmit method to manage form submission Register input fields into React Hook […]