Give Elm a Chance (newCodeCamp)

Transcript

1. 
 Give Elm a Chance! Joel Clermont
 @jclermont
2. Hello audience
3. Goal
 You leave here wanting to
 play with Elm for an afternoon
4. What to expect Elm language tour
5. What to expect What is Elm?
6. What to expect Why bother with Elm instead of Javascript?
7. What to expect What makes Elm useful and interesting? • Code that doesn’t crash • A powerful type system • Ecosystem: quality over quantity • Care-free refactoring • Amazing QA / debug experience
8. What is Elm?
9. What is Elm? Elm is a language that compiles to JS
10. What is Elm? Elm (currently) targets the browser
11. What is Elm? Elm does not replace PHP, C#, Elixir, etc
12. What is Elm? Elm does not (yet) replace JavaScript
13. The Elm Architecture
14. Language + Framework
15. Model
16. Update
17. View
19. No side effects
20. Questions?
21. Why bother with Elm instead of Javascript?
23. Why bother with Elm instead of Javascript? User interfaces get complex quickly
28. Questions?
29. No runtime exceptions
30. No runtime exceptions • Hooray, no bugs! Not quite.
31. No runtime exceptions • Hooray, no bugs! Not quite. • Runtime exceptions are a common class of bugs
32. No runtime exceptions • Hooray, no bugs! Not quite. • Runtime exceptions are a common class of bugs • “undefined is not a function”
33. No Red Ink’s testimonial Since we began using Elm in 2015, our production Elm code has yet to cause a single runtime exception. Our error logs show plenty of crashes from our legacy JavaScript code, but none from our Elm code. We've also found our Elm-powered front-end substantially easier to scale than our previous React code base.
34. Spot the error
35. Pattern matching
36. Error handling in types
37. Questions?
38. The power of the type system
39. The power of the type system • PHP’s type system is getting better, but still basic
40. The power of the type system • PHP’s type system is getting better, but still basic • C# and Java? Better yet, but not very expressive
41. The power of the type system • PHP’s type system is getting better, but still basic • C# and Java? Better yet, but not very expressive • ML type system
42. Algebraic data types
43. Data modeling!! https://youtu.be/IcgmSRJHu_8
44. Questions?
45. Ecosystem
46. Elm ecosystem • Package manager enforces semantic versioning
47. Elm ecosystem • Package manager enforces semantic versioning • API design is extremely thoughtful
48. Elm ecosystem • Package manager enforces semantic versioning • API design is extremely thoughtful • Awesome tooling!
49. Compiler
50. Editors
51. Editors
52. Editors
53. Editors
54. Editors
55. Debugger http://elm-lang.org/assets/blog/0.18/todomvc.html
56. Ellie https://ellie-app.com/kLKCgY6sK9/0
57. Questions?
58. My story with Elm
59. My final sales pitch • Welcoming community • Lots of effort to making concepts accessible • Easy to use it gradually • Will make you a better JavaScript developer
60. Closing survey
61. Next steps • http://elm-lang.org (live demos, debugger, REPL) • https://guide.elm-lang.org/ • https://www.elm-tutorial.org • https://pragmaticstudio.com/elm • https://frontendmasters.com/courses/elm/ • https://uwm.edu/business/research/centers-institutes/technology- innovation/cti-workshop-series/ • https://www.dailydrip.com/topics/elm • @elmlang @czaplic @rtfeldman @jclermont
62. Questions? @jclermont
63. Thank you! @jclermont