Here is a quick React custom Hook that supports copying text to the system clipboard. It also returns a copied/failed status that can be reflected in the UI

(I remember the days when we could only do this w/ Flash 😭)

more details in the thread 🧵👇🏾
useCopyToClipboard returns a copy function that the UI calls when the user wants to copy the text (likely a button click). It updates the status based on the success/failure of writing to the clipboard

It uses useCallback to ensure a stable function reference

It also uses useEffect to set a timeout that will reset the status after a specified amount of time. This basically makes the status fleeting, which is a typical user experience

And for my TypeScript peeps, here's useCopyToClipboard with (minimal) TS types added

If you want more detailed explanations on how each section of the code works or want something that you can copy & paste into your app (😉), check out my latest post on creating a copy to clipboard React custom Hook

Finally, I like sharing and teaching about React, TypeScript & other frontend development things. If you wanna keep up with what I share, feel free to subscribe to the weekly BenMVP Newsletter 🎉…

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More from @benmvp

26 Jan
Have y'all gotten that React warning about state updates after component unmount?

I get it mainly when running unit tests

Happens when:
- Make async request
- Component unmounts
- Response comes back
- Try to update state w/ new data

I've come up w/ 4️⃣ solutions

/thread 🧵👇🏾
Since vanilla JS Promises aren't cancellable the next best thing is to keep track of the mounted state & don't update state if the comp is unmounted

1️⃣ Variable to track mounted state

Quick & dirty, but only works in single useEffect w/ no deps

2️⃣ Ref to track mounted state

All effects can check the ref regardless of if they have deps. Will have to duplicate in multiple components tho

Read 8 tweets
14 Jan
If you're getting started with React in TypeScript one of the first things you'll wanna do is migrate from runtime prop-types over to static TS types

Typing a function component is the same as any function in TS

Typically props are typed with a TS `interface`

/thread 🧵👇🏾
The primitive prop types map over to their TS equivalents...

Special types like React nodes, enums, class instances, and others...

Read 7 tweets
5 Jan
Using objects/arrays in deps for React useEffect can cause it to run the effect on *every* re-render even if contents are the same cuz the references are different

We've got a couple of options...

1️⃣ Depend on the obj properties instead of the entire obj

/thread 🧵👇🏾 ImageImage
2️⃣ Duplicate the object within the effect when the *entire* object is needed. useEffect then depends on the pieces needed to create the object

In general creating object literals is cheap so the perf wins from optimized useEffect should outweigh the duplication

🧵👇🏾 Image
3️⃣ Memoize/cache the object w/ useMemo Hook if creating the object is too expensive to do it twice. The obj is now safe to use in deps

This is suggested by the `react-hooks/exhaustive-deps` ESLint rule (part of `eslint-plugin-react-hooks` which you should totally be using)

🧵👇🏾 Image
Read 6 tweets
15 Dec 20
I used to tell folks learning React to learn JS really well first. I had good intentions but was still gate-keeping 😔

But I do think knowing modern JS can really level-up your React skills and I've got top 10 features I think will help you be more awesome-r 🔥🔥

[🧵 thread]
1. ES Modules

I see lots of confusion about when to use named vs default imports. The import style depends on how it was exported (named or default)

Named imports go within the curly braces & the single default import is outside of them 🤓 ImageImage
2. Arrow functions

Arrow functions can exist everywhere within your React app. Some folks (like myself) replace all functions with arrows while others only use them in spots

They really win w/ character savings but for those unfamiliar w/ the syntax they can lose w/ clarity 🧐 ImageImage
Read 12 tweets

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