<h1 id="10-react-interview-questions-you-should-know-in-2022">10 React Interview Questions You Should Know in 2022<a aria-hidden="true" class="anchor-heading icon-link" href="#10-react-interview-questions-you-should-know-in-2022"></a></h1>
<p><a href="https://www.freecodecamp.org/news/react-interview-questions-to-know/">https://www.freecodecamp.org/news/react-interview-questions-to-know/</a></p>
<h1 id="what-is-the-difference-between-state-and-props">What is the difference between state and props?<a aria-hidden="true" class="anchor-heading icon-link" href="#what-is-the-difference-between-state-and-props"></a></h1>
<ul>
<li>States are <strong>values we can read and update</strong> in our React components.</li>
<li>Props are values that are <strong>passed to React components and are read only</strong> (they should not be updated).</li>
</ul>
<h1 id="what-are-react-fragments-used-for">What are React Fragments used for?<a aria-hidden="true" class="anchor-heading icon-link" href="#what-are-react-fragments-used-for"></a></h1>
<p>The fragment syntax looks like an empty set of tags &#x3C;>&#x3C;/> or are tags labeled React.Fragment.</p>
<h1 id="why-do-we-need-keys-for-react-lists">Why do we need keys for React lists?<a aria-hidden="true" class="anchor-heading icon-link" href="#why-do-we-need-keys-for-react-lists"></a></h1>
<p>React takes care of all of the business of updating the DOM for us (using a virtual DOM), but keys are necessary for React to update it properly.</p>
<h1 id="what-are-the-usecallback--usememo-hooks-used-for">What are the useCallback &#x26; useMemo hooks used for?<a aria-hidden="true" class="anchor-heading icon-link" href="#what-are-the-usecallback--usememo-hooks-used-for"></a></h1>
<p><code>useCallback</code> is to prevent functions that are declared within the body of function components from being recreated on every render.</p>
<p>This can lead to unnecessary performance issues, especially for callback functions that are passed down to child components.</p>

What are the useCallback & useMemo hooks used for?

What is the difference between state and props?

10 React Interview Questions You Should Know in 2022


Hi there 👋. I'm a Front-end developer.

---

> I've often described my motivation for building software to others using imagery: I like to go find a secluded beach, build a large, magnificent sand castle, and then walk away. Will anyone notice? Probably not. Will the waves eventually destroy it? Yep. Did I still get immense satisfaction? Absolutely.
>
> — [aliasxneo](https://news.ycombinator.com/item?id=41497113)

Simplicity, even if it sacrifices some ideal functionality has better survival characteristics than the-right-thing. — [The Rise of Worse is Better](https://www.dreamsongs.com/RiseOfWorseIsBetter.html)

> We love to see the process, not just the result. The imperfections in your work can be beautiful if they show your struggle for perfection, not a lack of care.
>
> — [ralphammer](https://ralphammer.com/is-perfection-boring/)

> [Roberto Blake was talking about making 100 crappy videos](https://www.youtube.com/watch?v=OnUBaQ1Sp_E) to get better over time. Putting in the reps and improving a little bit each time.
>
> Putting in the work without expecting any external reward at first (eg views, followers, likes, etc) will pay off in the long run. — [100 Scrappy Things](https://www.florin-pop.com/blog/100-scrappy-things/)

> A good match is a **structured** dance, where players aim to **score** while they are following well-defined **rules**. This **freedom within a structure** is what makes it fun.
>
> — [ralphammer](https://ralphammer.com/how-to-get-started/)

> “Motivation often comes after starting, not before. Action produces momentum.”
>
> — James Clear

> Focus is more about **not** keeping busy when you need to wait for something.  
> Eat the boredom for a minute.
>
> — [[life-tips#wodenokoto]]

> [4 minutes run hard enough to push heart rate to 90%, 3 minutes recover, repeat 4 times](https://news.ycombinator.com/item?id=34213181)
>
> - https://www.ntnu.edu/cerg/advice
> - [Get running with Couch to 5K](https://www.nhs.uk/live-well/exercise/running-and-aerobic-exercises/get-running-with-couch-to-5k/)

> [recommended routine - bodyweightfitness](https://www.reddit.com/r/bodyweightfitness/wiki/kb/recommended_routine/) - I Don't Have This Much Time!
>
> - Don't workout at all (saves anywhere from 20 to 60 minutes, but really, really, really, really, really, really, really, really, really not recommended)

> [Just 4 pages a day. It really adds up.](https://news.ycombinator.com/item?id=34779980)

> I think it should be everyone's primary focus to sleep well, drink water, get outside, get active, and eat generally decently. I hate to say it, but if you're not eating a good amount of vegetables and fruit, decent protein, sleep, etc, no amount of XYZ will catch up to that detriment.
>
> — [CE02](https://news.ycombinator.com/item?id=35056071)

> Before leaving for the day I leave a comment in code: I’m working on this, need to do A, B C… to get it working.
>
> — [makz](https://news.ycombinator.com/item?id=40744916)

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## What I read in past

- [[What I read in 2024|journal.what-i-read-in]]
  - [[2023|journal.what-i-read-in.2023]]
  - [[2022|journal.what-i-read-in.2022]]
- 📝 [Gists](https://gist.github.com/Luke-SNAW)
- 📜 [Journals](https://luke-snaw.github.io/Luke-SNAW__netlify-CMS.github.io/)

---

- [[journal.what-i-struggled-brag-in]]
