React in 100 Seconds
React is a lightweight JavaScript library built around components and hooks that drives a massive ecosystem for web and mobile development.
Highlights
1 clip · 1 min of 2 min-
- React components are simple JavaScript functions returning JSX.
- Data is passed into components via props.
- Internal state is managed reactively using hooks like useState.
That’s all the highlights.
Questions this video answers
4 · every answer cites the moment it was said01 How do I build a UI component in React? 2 sources · 0:08
React reduces UI building down to its theoretical minimum by making components simple JavaScript functions. The return value from this function is your HTML or UI, written in a special syntax called JSX that combines JavaScript with markup. You can pass data into a component by using a props argument which is then referenced inside the function body.
02 How do I manage internal component state? 2 sources · 0:43
To give a component its own internal state, you can use the state hook, which is a function returning a value and another function to change it. When the state value changes, React automatically reacts to update the UI. You can then bind the state-changing function to user events, like a button click, so the template always shows the most recent value.
03 Does React handle routing and state management out of the box? 2 sources · 1:14
React itself does not care about routing, state management, animation, or similar concerns. Instead, it lets those concerns evolve naturally within the open source community. As a result, a massive ecosystem surrounds the library with countless supporting options for static sites, server-side rendering, and forms.
04 Can I use React skills for mobile app development? 2 sources · 1:39
Once you have learned React, you can easily jump into React Native to start building mobile apps. Furthermore, knowing this UI library is currently one of the most in-demand skills for front-end developers.
Section-by-section summary
4 parts
React reduces UI building to functions
Developed by Facebook in 2013, React builds reusable user interfaces as simple JavaScript functions that return JSX.
Props and hooks handle data and state
Components accept arguments called props and use built-in state hooks to manage and reactively update internal data when events occur.
A vast ecosystem fills in the gaps
React focuses purely on UI, relying on a massive open-source ecosystem for routing, server-side rendering, animation, and state management.
Extends to mobile and careers
Skills learned in React transfer directly to React Native for mobile development, making it one of the most in-demand front-end skills.
Connects to your library
by shared topics
n next · p previous clip · t highlights/full
< > slower/faster · / search what was said
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React4× · first 0:00
A JavaScript library for building user interfaces developed at Facebook and released in 2013.
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JSX1× · first 0:29
A special syntax allowing you to easily combine JavaScript with HTML markup.
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Props1× · first 0:35
An argument passed into a component to supply data.
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State hook1× · first 0:47
A function that gives a component internal state by returning a value and a function to change it.
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React Native1× · first 1:41
A framework for building mobile apps using React knowledge.
473 words · about 2 min to read
React reduces UI building to functions
react a javascript library for building user interfaces developed at facebook and released in 2013 it's safe to say react has been the most influential ui library of recent memory we use it to build components that represent logical reusable parts of the ui the beauty of react is that the simplicity of building a component has been brought down to its
Props and hooks handle data and state
1 Highlight · Components, JSX, Props, and State Hooks
theoretical minimum it's just a javascript function it's so easy a caveman could do it the return value from this function is your html or ui which is written in a special syntax called jsx allowing you to easily combine javascript with html markup if you want to pass data into a component you simply pass it a props argument which you can then reference inside the function body or in the ui using braces if the value changes react will react to update the ui if we want to give our component its own internal state we can use the state hook the hook is just a function that returns a value as well as a function to change the value in this case count is our reactive state and setcount will change the state when used
A vast ecosystem fills in the gaps
in the template the count will always show the most recent value then we can bind set count to a button click event so the user can change the state react provides a variety of other built-in hooks to handle common use cases but the main reason you might want to use react is not the library itself but the massive ecosystem that surrounds it react itself doesn't care about routing state management animation or anything
like that instead it lets those concerns evolve naturally within the open source community no matter what you're trying to do there's very likely a good supporting library to help you get it done need a static site you have gatsby need server side rendering you have next for animation you have spring for forums you have formic state management you've got redux mobx flux recoil x state and
Extends to mobile and careers
more you have an endless supply of choices to get things done the way you like it as an added bonus once you have reactdown you can easily jump into react native and start building mobile apps and it's no surprise that knowing this little ui library is one of the most in-demand skills for front-end developers today this has been react in 100 seconds if you want to see more short videos like this make sure to like and subscribe and check out more advanced react content on fire ship i o and if you're curious how i make these videos make sure to check out my new personal channel and video on that topic thanks for watching and i will see you in the next one