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Elm, the runtime error killer
- 1. ELM, THE RUNTIME ERRORKILLER
- 8. 50 000 LINESOF ELM CODE 0 RUNTIME EXCEPTIONS
- 9. 100 000 LINESOF ELM CODE 0 RUNTIME EXCEPTIONS
- 12. ELM, THE RUNTIME ERRORKILLER
- 13. What is Elm Thesyntax Type system Architecture Tools provided by Elm repl reactor make package
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- 18. “Elm is adomain-speci c programming language for declaratively creating web browser-based graphical user interfaces. Elm is purely functional, and is developed with emphasis on usability, performance, and robustness. It advertises "no runtime exceptions in practice," made possible by the Elm compiler's static type checking.”
- 19. ELM CHARACTERISTICS Pure Functionallanguage All functions are curried Elm is strongly typed All values are immutable Elm is fast
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- 32. function add(x) { returnfunction (y) { return x + y; } } add(5)(10) // Returns 15 let addFive = add(5) addFive(10) // Returns 15 addFive(3) // Returns 8
- 37. QUICK RECAP Elm applicationstarts at the function main Function application by spaces Elm does not need "return" The last part of the function type is the return type All functions in Elm are curried Use the repl to play with functions and types The compiler is your friend
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- 44. program updateview "User clicks+" Produces "Increment" message
- 45. program updateview "User clicks+" Produces "Increment" message
- 46. program updateview "User clicks+" Produces "Increment" message
- 47. program updateview "User clicks+" Produces "Increment" message
- 48. program updateview "User clicks+" Produces "Increment" message
- 49. program updateview "User clicks+" Produces "Increment" message
- 50. program updateview "User clicks+" Produces "Increment" message
- 51. program updateview "User clicks+" Produces "Increment" message
- 52. program updateview "User clicks+" Produces "Increment" message
- 53. program updateview "User clicks+" Produces "Increment" message
- 54. program updateview "User clicks+" Produces "Increment" message
- 63. QUICK RECAP Elm logicis broken into: Model, view and update Messages are data Changes in the model are caused by messages The elm reactor allows for easy development
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- 69. QUICK RECAP Elm ispure functional Cmd: Tell elm "engine" to do something Sub: Listen to events in the Elm "engine"
- 70. WHEN TO USEELM? Whenever you can use React / Angular / Ember / Etc Fullscreen / Just this element Elm can communicate with javascript
- 71. QUICK RECAP ONTHE TOOLS elm-make is the compiler (and your friend) elm-repl lets you play with elm functions elm-reactor is a tool for easy development elm-package to install (and push) elm modules
- 72. WHERE TO GOFROM HERE elm-lang.org elm-lang.org/try package.elm-lang.org play with the elm-repl (Re)write something in elm!
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- 74. PLEASE RATE MEON JOIND.IN https://joind.in/talk/57ccb
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