Having fun with Kotlin fun()

Slides from my talk at droidcon Vienna 2018.

Transcript

1. Having fun with Kotlin fun()
2. What is a function ?
3. “ Quote a long definition from Wikipedia here….. OR fun myFunction() { // pretty awesome function right here }
4. Kotlin, give us a function !
5. Kotlin, give us a function !
6. Local Functions Functions within functions
8. Can’t unit test inner function Caveats/Gotchas Kotlin function doesn’t see local declarations in advance
9. Single Expression Functions
11. Top Level Functions Extend functionality
12. Extension Functions Extend functionality
13. Extension function
14. Resolved Statically Under the hood Receiver Object The static function is passed in the receiver object as a parameter
15. Companion objects/Static classes Caveats/Gotchas Member Functions Win
16. Named Arguments Thou shall name parameters
21. Default Parameters
23. Java interop isn’t great, must specify all parameters when calling Caveats/Gotchas
24. Lambda Expressions
26. Anonymous functions
28. Higher Order Functions
36. inline functions
39. Let’s inline all Higher Order Functions ! Caveats/Gotchas No access to private variables/members
41. Non local returns
47. Standard Functions
48. “ let, also, apply, run & with
51. “ Scoping functions
52. let
53. Usage of let
55. apply
56. Usage of apply
58. also
59. Usage of also
61. run
62. Usage of run
64. “ Transformation vs Mutating functions
65. “ also, apply - Mutating Functions
66. “ run, let - Transformation Functions
67. Danke Any questions? You can find me at: ◇ @AdnanM0123
68. Slide Theme ◇ Presentation template by SlidesCarnival ◇ Photographs by Unsplash