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dd010b34e2
Update links to use https:// where it is supported. There's probably a lot more that could be fixed, but these are the core ones I found (especially the download links in order to prevent MITM attacks). Note that there are some fb.me links that will redirect to http:// even while accessed over https://, but this seemed like the best way to fix those for now. NOTE: Only non-third-party files were modified. There are references to http:// URLs in vendored/third-party files, but seems appropriate to fix upstream for those rather than editing the files. Also, copy one image locally to the blog, as it was hotlinking to a site that did not support https://. Last, use youtube-nocookie.com instead of youtube.com for video embeds, as the former doesn't try to set a cookie on load (privacy enhancement).
30 lines
1.5 KiB
Markdown
30 lines
1.5 KiB
Markdown
---
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id: why-react
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title: Why React?
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permalink: why-react.html
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next: displaying-data.html
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---
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React is a JavaScript library for creating user interfaces by Facebook and Instagram. Many people choose to think of React as the **V** in **[MVC](https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller)**.
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We built React to solve one problem: **building large applications with data that changes over time**. To do this, React uses two main ideas.
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## Simple
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Simply express how your app should look at any given point in time, and React will automatically manage all UI updates when your underlying data changes.
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## Declarative
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When the data changes, React conceptually hits the "refresh" button, and knows to only update the changed parts.
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## Build Composable Components
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React is all about building reusable components. In fact, with React the *only* thing you do is build components. Since they're so encapsulated, components make code reuse, testing, and separation of concerns easy.
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## Give It Five Minutes
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React challenges a lot of conventional wisdom, and at first glance some of the ideas may seem crazy. [Give it five minutes](https://signalvnoise.com/posts/3124-give-it-five-minutes) while reading this guide; those crazy ideas have worked for building thousands of components both inside and outside of Facebook and Instagram.
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## Learn More
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You can learn more about our motivations behind building React in [this blog post](/react/blog/2013/06/05/why-react.html).
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