The document discusses the evolution and significance of JavaScript, highlighting its initial challenges, resurgence with AJAX, and wide acceptance across various platforms. It contrasts the language's perceived drawbacks with its advantages, emphasizing its dynamic nature, event-driven capabilities, and continuous improvement, particularly with the introduction of ES6/ES2015. The author advocates for better usage of JavaScript to enhance its functionality and address existing issues.

1. JS
UHMMM..

2. JAVASCRIPT

4. @AayushShrestha
Co-Founder - LISHN
Head of Experience Design & Architecture -Viveka Health
fb.me/ShresthaAayush
aayushonweb@gmail.com

5. • What is JavaScript, really?
• What’s all the fuss about?
• ES6 / ES2015 / ECMAScript 2015

6. The world’s most
popular language.

7. POPULARITY STACK OVERFLOW VS GITHUB

8. STACK OVERFLOW TAG NAME TRENDS

9. RANKED BY # OF PROGRAMMING JOBS

10. The world’s most
unpopular language.

11. BRENDEN EICH
JAVA SCHEME SELF
LiveScript
JavaScript
ECMAScript

12. The web was a disappointment
as an application delivery
system in 2000s.
- Page replacement inefficient.
- Java Applets FAILED!
- Nobody believed in JavaScript.

13. The web is dead.
-People of early 2000

14. Microsoft
abandoned web.

15. AJAX
-JavaScript gets a second chance.

17. PLENTY OF REASONS TO HATE JAVASCRIPT
• It has bad parts. REALLY REALLY BAD PARTS.
• Slow execution.
• DOM is a headache.
• It’s not C, C#, Java, Python, Ruby….
• It does not go away.

18. JavaScript has
good parts.
That’s why you like it.

19. JavaScript is a functional
language with dynamic
objects and familiar syntax.

20. Scales from
beginners to masters.

21. Very effective in an event-
driven application model.

22. Programs can be significantly
smaller compared to equivalent
program in other languages.

23. Always evolving and
proving people wrong.

25. JAVASCRIPT IS EVERYWHERE

26. JAVASCRIPT IS EVERYWHERE
• Browsers
• Applications
• OS
• Databases
• Mobile
• Electronics
• Servers

27. — Jeff Atwood (2007)
Any application that can be written
in javascript, will eventually be
written in javascript
”
“
ATWOOD’S LAW

28. Can JavaScript become
a better language?
YES!!

29. The most effective way is
to remove the bad parts.
DUH!!

30. Write code that not only
works, but looks correct too.
JS will become better if we use it
better.

31. ES2015
Faster. easier. Better.

32. MAIN GOALS OF ES6
• Fix (some of) ES5 issues
• Backwards Compatibility
• Modern Syntax
• Better suited for big applications
• New features

33. - Transpiler
- Converts future JS to working JS

34. Some
ES6/ES2015
Features
LET’S WRITE SOME ES6!
:)

35. LET

36. CONST

37. TEMPLATE STRINGS

38. CLASSES

39. CLASSES :
INHERITANCE

40. CLASSES :
GETTER/SETTER

41. ARROW FUNCTIONS

42. DESTRUCTURING

43. DESTRUCTURING

44. MORE COOL STUFFS
• Modules
• Promises
• Symbols
• Generators
• Map/Set Weakmap/Weakset
• More libraries and Core functions extension

45. REFERENCES
• David Crockford’s talk “Really. JavaScript”
• http://es6-features.org/

46. @AayushShrestha
QUESTIONS?
fb.me/ShresthaAayush
aayushonweb@gmail.com