Functional Paradigm in JavaScript

Transcript

1. FUNCTIONAL PARADIGM IN JAVASCRIPT LEARN A BRAND NEW WORLD
2. I’M STILL LOOKING FOR AN ANSWER WHO AM I? ▸ Developer Advocate at Onix-Systems, Kirovohrad; ▸ KirovohradJS organizer; ▸ Active speaker on CityJS conferences (KharkivJS, OdessaJS, KirovohradJS, KyivJS, JavaScript Frameworks Days); ▸ Believe that IT community can be created in Kirovohrad;
3. WHY DO WE NEED TO KNOW ABOUT FUNCTIONAL PROGRAMMING?
4. KNOWING ONE PARADIGM IS LIKE KNOWING ONE LANGUAGE. YOU’RE LIMITING YOURSELF. Eugene Obrezkov IT’S ALL ABOUT SELF-EXPRESSION
5. HOW I SEE PROGRAMMERS THAT KNOW ONLY ONE LANGUAGE\PARADIGM?
7. NOBODY ASKS YOU TO WRITE IN FUNCTIONAL PARADIGM. I WANT YOU TO KNOW ABOUT IT.
8. IT’S NOT ABOUT CODE, ALGORITHMS, WHATEVER. IT’S ABOUT CONCEPTS.
9. FUNCTIONAL PROGRAMMING, LET’S NAP ON IT FUNCTIONAL PROGRAMMING CONCEPTS ▸ Programming is done with expressions or declarations, instead of statements; ▸ Pure functions are functions that have no side effects; ▸ Higher-order functions (HOF) are functions that can either take other function as argument or return them as result; ▸ Closures are lexically scoped functions within first-class functions; ▸ Curried function is a function that takes all arguments and returns result, or takes a subset of arguments and returns function that is waiting for other arguments;
10. EXPRESSIONS INSTEAD OF STATEMENTS
11. THIS IS NOT A PURE FUNCTION
12. THIS IS A PURE FUNCTION
13. HIGHER-ORDER FUNCTION
14. HIGHER-ORDER FUNCTION
15. CLOSURES
16. CURRIED FUNCTION
17. FUNCTION COMPOSITION
19. HOW DOES THIS HELP US WRITE MORE MAINTAINABLE CODE?
20. THIS IS NOT FUNCTIONAL PROGRAMMING
21. THIS IS FUNCTIONAL PROGRAMMING
22. 9 LINES IN FUNCTIONAL 43 LINES OF CODE IN IMPERATIVE
24. WE HAVE DECREASED CODEBASE BY 80% BUT THAT’S TRUE
25. KNOWING DIFFERENT PARADIGMS HELPS YOU CHOOSE A RIGHT WAY FOR YOUR EXACT CASE!
26. THANKS! ghaiklor blog.ghaiklor.com ghaiklor