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https://en.wikibooks.org/wiki/Java_Persistence/ManyToOne# https://en.wikibooks.org/wiki/Java_Persistence/OneToOne

React Router Traditional multi-page web application uses server based routing where the user requests for a page, the request goes to the server, and when they navigate through different parts of the web page it a new request will be sent to the server to req...

useState The fundamental of storing information. useState hook allow you to create local state returning you both the value that you can access as well as a setter to modify the value. The modification of the state will trigger a re-rendering of the component...

Reducer In an React application you might have a lot of state that you're maintaining across multiple event handler and it can get overwhelming. You can consolidate those state update logic outside of the component into a single function called a reducer. The...

Global Variables Global variables in React persist even after re-render. Only the local variable that's instantiated within the React component will not survive the re-rendering, meaning that if the component is updated, those local variable's value will be r...

https://javascript.info/promise-error-handling   Using async functions https://devtrium.com/posts/async-functions-useeffect