mHungarianNotation and sAndroid

Hungarian notations in an Android world.

Links:
Original Sinomyi topic - https://msdn.microsoft.com/en-us/library/aa260976(v=vs.60).aspx
Jake Wharton blog post about Hungarian notation and android http://jakewharton.com/just-say-no-to-hungarian-notation/
Wiki - https://en.wikipedia.org/wiki/Hungarian_notation
Joel Spolsky blog post about a Hungarian notation = https://www.joelonsoftware.com/2005/05/11/making-wrong-code-look-wrong/

Transcript

1. mHungarianNotation and sAndroid mHungarianNotation and sAndroid
2. In Android sources/samples/libraries you might find In Android sources/samples/libraries you might find
3. p r i v a t e S h m o b j e c t m S o m e t h i n g p r i v a t e I t e r n a l S i n g l e t o n s S o m e t h i n g p r i v a t e S h m o b j e c t m S o m e t h i n g p r i v a t e I t e r n a l S i n g l e t o n s S o m e t h i n g
4. It doesn't play well with our code style It doesn't play well with our code style
5. Actually, you can find our checkstyle config on Stanfy GitHub Actually, you can find our checkstyle config on Stanfy GitHub
6. Why do they use this "m" prefixes? Why do they use this "m" prefixes?
7. Because of AOSP Code Style Rules Because of AOSP Code Style Rules
8. Non-public, non-static field names start with m Non-public, non-static field names start with m
9. Static field names start with s Static field names start with s
10. But people say that this is just a Hungarian notation But people say that this is just a Hungarian notation
11. What is this? What is this?
12. Hungarian notation was proposed by Charles Simonyi Hungarian notation was proposed by Charles Simonyi
13. Interesting fact: Simonyi has been in space twice (!) as a tourist Interesting fact: Simonyi has been in space twice (!) as a tourist
14. He worked in Xerox PARC on first GUI (in 1972-1981) He worked in Xerox PARC on first GUI (in 1972-1981)
15. After this he worked Microsoft (the main architect in Word team) After this he worked Microsoft (the main architect in Word team)
16. In document each pixel has two coordinates: • relatively to a window • relatively to a document (page) In document each pixel has two coordinates: • relatively to a window • relatively to a document (page)
17. Idea: use prefixes that describes variable value/type Idea: use prefixes that describes variable value/type
18. w X , w Y / / w i n d o w c o o r d i n a t e s p X , p Y / / p a g e c o o r d i n a t e s w X , w Y / / w i n d o w c o o r d i n a t e s p X , p Y / / p a g e c o o r d i n a t e s
19. Such naming is called "application" Hungarian notation Such naming is called "application" Hungarian notation
20. Hungarian because: a) Simonyi is from Hungary b) Words in Hungarian language contains many consequent consonants Hungarian because: a) Simonyi is from Hungary b) Words in Hungarian language contains many consequent consonants
21. Notation spread widely in Microsoft Notation spread widely in Microsoft
22. Microsoft devs used C a lot Microsoft devs used C a lot
23. C is "loosely" typed C is "loosely" typed
24. They were adding prefixes to show a var type They were adding prefixes to show a var type
25. b F l a g / / b o o l e a n f l a g u 1 6 S i z e / / u n s i g n e d 1 6 - b i t i n t e g e r s i z e s t T i m e / / c l o c k t i m e s t r u c t u r e b F l a g / / b o o l e a n f l a g u 1 6 S i z e / / u n s i g n e d 1 6 - b i t i n t e g e r s i z e s t T i m e / / c l o c k t i m e s t r u c t u r e
26. This was a misunderstanding of an initial idea This was a misunderstanding of an initial idea
27. But became de facto standard for Windows programming in 90s But became de facto standard for Windows programming in 90s
28. Such naming has some advantages for languages with a "loose" typing Such naming has some advantages for languages with a "loose" typing
29. For Android world this approach is a bit outdated For Android world this approach is a bit outdated
30. In languages with "strong" typing you always know a variable type In languages with "strong" typing you always know a variable type
31. field/local variables might be distinguished by a syntax highlighting field/local variables might be distinguished by a syntax highlighting
32. Variable names becomes msDxUnpronounceable Variable names becomes msDxUnpronounceable
33. Even Microsoft doesn't recommend use HN in .NET code Even Microsoft doesn't recommend use HN in .NET code
34. But some Android samples use it. Sometimes. But some Android samples use it. Sometimes.
35. Maybe, it's because this samples are written by old-school C programmers :) Maybe, it's because this samples are written by old-school C programmers :)
36. In Android world with Android Studio and Java (with strong typing) we definitely can live without HN In Android world with Android Studio and Java (with strong typing) we definitely can live without HN
37. Google explicitly and actively forbids Hungarian notation in their Java style guide Google explicitly and actively forbids Hungarian notation in their Java style guide
38. Linus Torvalds and Jake Wharton strongly recommend don't use it Linus Torvalds and Jake Wharton strongly recommend don't use it
39. Lets create readable code! Lets create readable code!
40. You can find links to resources in description You can find links to resources in description
41. The end Michael Pustovit, Stanfy @pustovit The end Michael Pustovit, Stanfy @pustovit
42. PS Slides were created with trikita.co/slide/ PS Slides were created with trikita.co/slide/