Merge branch 'master' into master

Author: taehwanno

CODE_OF_CONDUCT.md

@@ -1,5 +1,76 @@
 # Code of Conduct
 
-Facebook has adopted a Code of Conduct that we expect project participants to adhere to.
-Please read the [full text](https://code.fb.com/codeofconduct/)
-so that you can understand what actions will and will not be tolerated.
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to make participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies within all project spaces, and it also applies when
+an individual is representing the project or its community in public spaces.
+Examples of representing a project or community include using an official
+project e-mail address, posting via an official social media account, or acting
+as an appointed representative at an online or offline event. Representation of
+a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at <[email protected]>. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

content/blog/2017-07-26-error-handling-in-react-16.md

@@ -111,4 +111,4 @@ Error boundaries preserve the declarative nature of React, and behave as you wou
 
 React 15 included a very limited support for error boundaries under a different method name: `unstable_handleError`. This method no longer works, and you will need to change it to `componentDidCatch` in your code starting from the first 16 beta release.
 
-For this change, we’ve provided [a codemod](https://github.com/reactjs/react-codemod#error-boundaries) to automatically migrate your code.
+For this change, we’ve provided a [codemod](https://github.com/reactjs/react-codemod#error-boundaries) to automatically migrate your code.

content/blog/2019-08-15-new-react-devtools.md

@@ -60,6 +60,9 @@ git clone https://github.com/facebook/react-devtools
 
 cd react-devtools
 
+# Checkout the previous release branch
+git checkout v3
+
 # Install dependencies and build the unpacked extension
 yarn install
 yarn build:extension

content/community/articles.md

@@ -14,3 +14,5 @@ permalink: community/articles.html
 - [Simple React Development in 2017](https://hackernoon.com/simple-react-development-in-2017-113bd563691f) - Joshua Comeau's guide to showcase how easy it can be to start modern React development.
 - [Visual Guide to State in React](https://daveceddia.com/visual-guide-to-state-in-react/) - Dave Ceddia's visual guide to React state.
 - [The Hands-On Guide to Learning React Hooks](https://www.telerik.com/kendo-react-ui/react-hooks-guide/) - Eric Bishard's step-by-step guide to learning React Hooks.
+- [How to Use the React Profiler Component to Measure Render Performance](https://medium.com/@adamhenson/how-to-use-the-react-profiler-component-to-measure-performance-improvements-from-hooks-d43b7092d7a8) - Adam Henson's article exemplifying a use case for `<React.Profiler />`.
+- [Thinking in React Hooks](https://wattenberger.com/blog/react-hooks) - Amelia Wattenberger's provides visualizations and highlighting the mindset change needed switching from classes to functional components + hooks.

content/community/conferences.md

@@ -12,51 +12,6 @@ Do you know of a local React.js conference? Add it here! (Please keep the list c
 
 ## Upcoming Conferences {#upcoming-conferences}
 
-### React Conf Iran 2019 {#react-conf-iran-2019}
-August 29, 2019. Tehran, Iran.
-
-[Website](https://reactconf.ir/) - [Twitter](https://twitter.com/reactconf_ir) - [Instagram](https://www.instagram.com/reactconf/)
-
-### React Rally 2019 {#react-rally-2019}
-August 22-23, 2019. Salt Lake City, USA.
-
-[Website](https://www.reactrally.com/) - [Twitter](https://twitter.com/ReactRally) - [Instagram](https://www.instagram.com/reactrally/)
-
-### ComponentsConf 2019 {#componentsconf-2019}
-September 6, 2019 in Melbourne, Australia
-
-[Website](https://www.componentsconf.com.au/) - [Twitter](https://twitter.com/componentsconf)
-
-### React Native EU 2019 {#react-native-eu-2019}
-September 5-6 in Wrocław, Poland
-
-[Website](https://react-native.eu) - [Twitter](https://twitter.com/react_native_eu) - [Facebook](https://www.facebook.com/reactnativeeu)
-
-### React New York 2019 {#react-new-york-2019}
-September 13th, 2019. New York, USA
-
-[Website](https://reactnewyork.com/) - [Twitter](https://twitter.com/reactnewyork)
-
-### React Live 2019 {#react-live-2019}
-September 13th, 2019. Amsterdam, The Netherlands
-
-[Website](https://www.reactlive.nl/) - [Twitter](https://twitter.com/reactlivenl)
-
-### React Boston 2019 {#react-boston-2019}
-September 21-22, 2019 in Boston, Massachusetts USA
-
-[Website](https://www.reactboston.com/) - [Twitter](https://twitter.com/reactboston)
-
-### React India 2019 {#react-india-2019}
-September 26-28, 2019 in Goa, India
-
-[Website](https://www.reactindia.io/) - [Twitter](https://twitter.com/react_india) - [Facebook](https://www.facebook.com/ReactJSIndia)
-
-### React Alicante 2019 {#react-alicante-2019}
-September 26-28, 2019 in Alicante, Spain
-
-[Website](http://reactalicante.es/) - [Twitter](https://twitter.com/reactalicante) - [Facebook](https://www.facebook.com/ReactAlicante)
-
 ### React Conf 2019 {#react-conf-2019}
 October 24-25, 2019 in Henderson, Nevada USA
 
@@ -67,6 +22,11 @@ October 25, 2019 in London, UK
 
 [Website](https://reactadvanced.com) - [Twitter](http://twitter.com/reactadvanced) - [Facebook](https://www.facebook.com/ReactAdvanced) - [Videos](https://youtube.com/c/ReactConferences)
 
+### React Conf Brasil 2019 {#react-conf-2019}
+October 19, 2019 in São Paulo, BR
+
+[Website](https://reactconf.com.br/) - [Twitter](https://twitter.com/reactconfbr) - [Facebook](https://www.facebook.com/ReactAdvanced) - [Slack](https://react.now.sh/)
+
 ### React Day Berlin 2019 {#react-day-berlin-2019}
 December 6, 2019 in Berlin, Germany
 
@@ -80,13 +40,28 @@ February 27 & 28, 2020 in Sydney, Australia
 ### Render-Atlanta 2020 {#render-atlanta-2020}
 May 4-6, 2020. Atlanta, GA, USA.
 
-[Website](https://renderatl.com)
+[Website](https://renderatl.com) - [Twitter](https://twitter.com/renderATL) - [Instagram](https://www.instagram.com/renderatl/) - [Facebook](https://www.facebook.com/renderatl/) 
+
+### ReactEurope 2020 {#reacteurope-2020}
+May 14-15, 2020 in Paris, France
+
+[Website](https://www.react-europe.org) - [Twitter](https://twitter.com/ReactEurope) - [Facebook](https://www.facebook.com/ReactEurope) - [Videos](https://www.youtube.com/c/ReacteuropeOrgConf)
+
+### React Finland 2020 {#react-finland-2020}
+May 26-29 in Helsinki, Finland
+
+[Website](https://react-finland.fi/) - [Twitter](https://twitter.com/ReactFinland)
 
 ### React Next 2020 {#react-next-2020}
 June 15, 2020. Tel Aviv, Israel.
 
 [Website](https://react-next.com/) - [Twitter](https://twitter.com/reactnext) - [Facebook](https://www.facebook.com/ReactNext2016/) 
 
+### React Week NY 2020 {#react-week-NY-2020}
+July 17, 2020. New York City, USA.
+
+[Website](https://reactweek.nyc/) - [Twitter](https://twitter.com/reactweek) - [Facebook](https://www.facebook.com/reactweek) 
+
 
 ## Past Conferences {#past-conferences}
 
@@ -422,3 +397,48 @@ July 11-12, 2019. Portland, OR, USA.
 
 [Website](https://infinite.red/ChainReactConf)
 
+### React Rally 2019 {#react-rally-2019}
+August 22-23, 2019. Salt Lake City, USA.
+
+[Website](https://www.reactrally.com/) - [Twitter](https://twitter.com/ReactRally) - [Instagram](https://www.instagram.com/reactrally/)
+
+### React Conf Iran 2019 {#react-conf-iran-2019}	
+August 29, 2019. Tehran, Iran.	
+
+[Website](https://reactconf.ir/) - [Videos](https://www.youtube.com/playlist?list=PL-VNqZFI5Nf-Nsj0rD3CWXGPkH-DI_0VY) - [Highlights](https://github.com/ReactConf/react-conf-highlights)
+
+### React Native EU 2019 {#react-native-eu-2019}
+September 5-6 in Wrocław, Poland
+
+[Website](https://react-native.eu) - [Twitter](https://twitter.com/react_native_eu) - [Facebook](https://www.facebook.com/reactnativeeu)
+
+### ComponentsConf 2019 {#componentsconf-2019}
+September 6, 2019 in Melbourne, Australia
+
+[Website](https://www.componentsconf.com.au/) - [Twitter](https://twitter.com/componentsconf)
+
+### React New York 2019 {#react-new-york-2019}
+September 13th, 2019. New York, USA
+
+[Website](https://reactnewyork.com/) - [Twitter](https://twitter.com/reactnewyork)
+
+### React Live 2019 {#react-live-2019}
+September 13th, 2019. Amsterdam, The Netherlands
+
+[Website](https://www.reactlive.nl/) - [Twitter](https://twitter.com/reactlivenl)
+
+### React Boston 2019 {#react-boston-2019}
+September 21-22, 2019 in Boston, Massachusetts USA
+
+[Website](https://www.reactboston.com/) - [Twitter](https://twitter.com/reactboston)
+
+### React India 2019 {#react-india-2019}
+September 26-28, 2019 in Goa, India
+
+[Website](https://www.reactindia.io/) - [Twitter](https://twitter.com/react_india) - [Facebook](https://www.facebook.com/ReactJSIndia)
+
+### React Alicante 2019 {#react-alicante-2019}
+September 26-28, 2019 in Alicante, Spain
+
+[Website](http://reactalicante.es/) - [Twitter](https://twitter.com/reactalicante) - [Facebook](https://www.facebook.com/ReactAlicante)
+

content/community/courses.md

@@ -8,6 +8,8 @@ permalink: community/courses.html
 
 ## Free Courses {#free-courses}
 
+- [Glitch: React Starter Kit](https://glitch.com/culture/react-starter-kit/) - A free, 5-part video course with interactive code examples that will help you learn React.
+
 - [Codecademy: React 101](https://www.codecademy.com/learn/react-101) - Codecademy's introductory course for React.
 
 - [Egghead.io: Start Learning React](https://egghead.io/courses/start-learning-react) - This series will explore the basic fundamentals of React to get you started.

content/community/examples.md

@@ -21,3 +21,7 @@ There are many example projects created by the React community. Feel free to add
 * **[Bitcoin Price Index](https://github.com/mrkjlchvz/bitcoin-price-index)** Simple bitcoin price index data from CoinDesk API.
 * **[Builder Book](https://github.com/builderbook/builderbook)** Open source web app to write and host documentation or sell books. Built with React, Material-UI, Next, Express, Mongoose, MongoDB.
 * **[GFonts Space](https://github.com/pankajladhar/GFontsSpace)** A space which allows user to play with Google fonts. Built with React, Redux and React-Router.
+* **[Course Learn Page](https://github.com/ulearnpro/ulearn)** Open Source LMS script in Laravel 5.8 and ReactJS 16.9
+* **[Speedy math](https://github.com/pankajladhar/speedy-math)** An application which allows kids to practice basic Mathematics i.e  Addition, Subtraction, Multiply, Comparison. It is a PWA (Progressive web app) with offline support and install as App features.
+* **[Unit Converter](https://github.com/KarthikeyanRanasthala/react-unit-converter)** Minimal Yet Responsive Unit Converter Built With React, Material-UI & Convert-Units.
+* **[BMI Calculator](https://github.com/GermaVinsmoke/bmi-calculator)** A React Hooks app for calculating BMI

content/community/meetups.md

@@ -25,12 +25,12 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet
 * [Joinville](https://www.meetup.com/pt-BR/React-Joinville/)
 * [Rio de Janeiro](https://www.meetup.com/pt-BR/React-Rio-de-Janeiro/)
 * [São Paulo](https://www.meetup.com/pt-BR/ReactJS-SP/)
+* [Vila Velha](https://www.meetup.com/pt-BR/React-ES/)
 
 ## Bolivia {#bolivia}
 * [Bolivia](https://www.meetup.com/ReactBolivia/)
 
 ## Canada {#canada}
-* [Montreal, QC - ReactJS](https://www.meetup.com/fr-FR/ReactMontreal/)
 * [Montreal, QC - React Native](https://www.meetup.com/fr-FR/React-Native-MTL/)
 * [Vancouver, BC](https://www.meetup.com/ReactJS-Vancouver-Meetup/)
 * [Ottawa, ON](https://www.meetup.com/Ottawa-ReactJS-Meetup/)
@@ -50,6 +50,7 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet
 * [React.JS Girls London](https://www.meetup.com/ReactJS-Girls-London/)
 
 ## France {#france}
+* [Lille](https://www.meetup.com/ReactBeerLille/)
 * [Paris](https://www.meetup.com/ReactJS-Paris/)
 
 ## Germany {#germany}
@@ -58,8 +59,7 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet
 * [Karlsruhe](https://www.meetup.com/react_ka/)
 * [Kiel](https://www.meetup.com/Kiel-React-Native-Meetup/)
 * [Munich](https://www.meetup.com/ReactJS-Meetup-Munich/)
-* [React Berlin](https://www.meetup.com/React-Berlin/)
-* [React.JS Girls Berlin](https://www.meetup.com/ReactJS-Girls-Berlin/)
+* [React Berlin](https://www.meetup.com/React-Open-Source/)
 
 ## Greece {#greece}
 * [Thessaloniki](https://www.meetup.com/Thessaloniki-ReactJS-Meetup/)
@@ -144,8 +144,9 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet
 * [New York, NY - ReactJS](https://www.meetup.com/NYC-Javascript-React-Group/)
 * [New York, NY - React Ladies](https://www.meetup.com/React-Ladies/)
 * [New York, NY - React Native](https://www.meetup.com/React-Native-NYC/)
+* [New York, NY - useReactNYC](https://www.meetup.com/useReactNYC/)
 * [Palo Alto, CA - React Native](https://www.meetup.com/React-Native-Silicon-Valley/)
-* [Philadelphia, PA - ReactJS](https://www.meetup.com/RQ-React/)
+* [Philadelphia, PA - ReactJS](https://www.meetup.com/Reactadelphia/)
 * [Phoenix, AZ - ReactJS](https://www.meetup.com/ReactJS-Phoenix/)
 * [Pittsburgh, PA - ReactJS/React Native](https://www.meetup.com/ReactPgh/)
 * [Portland, OR - ReactJS](https://www.meetup.com/Portland-ReactJS/)

content/community/support.md

@@ -12,6 +12,8 @@ React has a community of millions of developers.
 
 On this page we've listed some React-related communities that you can be a part of; see the other pages in this section for additional online and in-person learning materials.
 
+Before participating in React's communities, [please read our Code of Conduct](https://github.com/facebook/react/blob/master/CODE_OF_CONDUCT.md). We have adopted the [Contributor Covenant](https://www.contributor-covenant.org/) and we expect that all community members adhere to the guidelines within.
+
 ## Stack Overflow {#stack-overflow}
 
 Stack Overflow is a popular forum to ask code-level questions or if you're stuck with a specific error. Read through the [existing questions](https://stackoverflow.com/questions/tagged/reactjs) tagged with **reactjs** or [ask your own](https://stackoverflow.com/questions/ask?tags=reactjs)!
@@ -24,7 +26,7 @@ Each community consists of many thousands of React users.
 
 * [DEV's React community](https://dev.to/t/react)
 * [Hashnode's React community](https://hashnode.com/n/reactjs)
-* [Reactiflux online chat](https://discord.gg/0ZcbPKXt5bZjGY5n)
+* [Reactiflux online chat](https://discord.gg/reactiflux)
 * [Reddit's React community](https://www.reddit.com/r/reactjs/)
 * [Spectrum's React community](https://spectrum.chat/react)
 

content/community/tools-debugging.md

@@ -5,4 +5,4 @@ layout: community
 permalink: community/debugging-tools.html
 ---
 
-  * **[React Developer Tools](https://github.com/facebook/react-devtools):** an extension available for [Chrome](https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi), [Firefox](https://addons.mozilla.org/firefox/addon/react-devtools/), and as a [standalone app](https://github.com/facebook/react-devtools/tree/master/packages/react-devtools) that allows you to inspect the React component hierarchy in the Chrome Developer Tools.
+  * **[React Developer Tools](https://github.com/facebook/react-devtools):** an extension available for [Chrome](https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi), [Firefox](https://addons.mozilla.org/firefox/addon/react-devtools/), and as a [standalone app](https://github.com/facebook/react/tree/master/packages/react-devtools) that allows you to inspect the React component hierarchy in the Chrome Developer Tools.