React is an open-source JavaScript library for building user interfaces that runs in browsers and mobile devices. It uses a component-based approach with a virtual DOM that provides declarative views for application state without boilerplate code. The document recommends learning React by writing simple apps using React code, watching tutorials, following blogs, and attending conferences. It provides examples of large companies that use React like Facebook, WhatsApp, Airbnb and Netflix.

1. Introduction to React
Jozef Spišiak

2. Start with Why
(Simon Sinek)

3. Source: https://insights.stackoverflow.com/survey/2019/#technology

4. Source: https://insights.stackoverflow.com/survey/2019/#most-loved-dreaded-and-wanted

5. Source: https://insights.stackoverflow.com/survey/2019/#most-loved-dreaded-and-wanted

6. Good salary

7. How to learn react?
● Write react code for simple apps. Dogfooding (using your own apps)
○ Example: track gym progress, daily diary, todo list
● Only write parts of app in react that make sense.
○ World of Tanks is written in C++ and Python, but uses React for UI
● Watch tutorials (thousands on the internet)
● Follow official react blog and blogs of react developers (@and_abramov,
@brian_d_vaughn)
● Attend conferences (@reactiveconf)

8. What is React?
● Open-source JavaScript library for building user interfaces
● Runs in browser and mobile devices (as React Native)
● Component based virtual DOM tree
● Declarative views for application state with no boilerplate
● Started by Facebook

9. Demo time!

10. ● Community
● Documentation
● Tooling
● Easy to get started
Why not:
● Hate websites
● Don’t need UI
○ Data analysis, static information
display, video streaming
● Super light application

11. Example
projects done
with React
● Facebook
● WhatsApp
● Airbnb
● Netflix
● New York Times
● Dropbox
● Kiwi.com

12. About me
● Work for VacuumLabs for 2.5 years
● Worked in Sweden (Malmö) for 5 years and
3 in Bratislava before
● Studied FMFI UK Informatics Mgr.
● Worked with CMS, CRM systems, eshops
mostly PHP based
● Last 2 years React frontend
● Projects:
○ eset.com
○ kiwi.com
○ joj.sk
○ visitsweden.com
○ nazar.se
○ t3kit.com

13. Questions?

14. Thank you!