Here are some notes from the Epic React workshop Advanced Hooks. Function Dependencies in useEffect We use the useEffect hook to run side effects in React. The hook has a “dependency array” which tells it when to fire. That works fine if the trigger is a variable. Like this: const [count, setCount] = useState(0) React.useEffect(() => { // Update the document title using the browser API document.title = You clicked ${count}times }, [count]) // <– that's the dependency list What happens if we use a function as a trigger?

Today I needed to remove backslashes from a number of files. I have yaml frontmatter that should look like this: tags: - React.js - JavaScript I had some files that had backslashes before the dash: tags: - React.js - JavaScript You can use Unix tools like grep or sed to search all files that match a pattern. Then you can replace that pattern. But you have to remember that a backslash is a special character.

You’ve got a Node.js back-end server running Express and want to store sessions. You use TypeScript for your server. Let’s see some example code. Excerpt: // src/resolvers/AuthResolver.ts import { MyContext } from '../graphql-types/MyContext'; // more imports // { … } @Mutation(() => UserResponse) async login( @Arg("input") { email, password }: AuthInput, @Ctx() ctx: MyContext ): Promise<UserResponse> { const user = await User.findOne({ where: { email } }) if (!

Here are five resources for this weekend: The Big List of 101 Places to Learn to Code for Free: tons of free resources Build and Deploy a Full Stack MERN Project - React + Redux, Node, Express, MongoDB [Part 1/2]: complete app tutorial in 2 parts Some “cool” machine learning books: a list of machine-learning books, might be of interest Next.js 101 - Free Online Course: short mini-course on Next.

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