1) The document discusses various design patterns that can help prevent messy code, including builder pattern, composite pattern, observer pattern, strategy pattern, and repository pattern. 2) It provides examples of how to implement these patterns in code to improve code organization, readability, and maintenance. 3) The design patterns are presented as solutions to problems the author encountered in past projects around unorganized code structure and logic, variable overuse, and cross-platform compatibility issues.

1. Solusi Mencegah Coding
Ruwet
design pattern - clean code - clean architecture
ARIF AKBARUL HUDA
source code https://gist.github.com/omayib/0f9fed4bda6e76a7b94185a7f9c79b73

3. WHAT THE FUCK
WHY IT IS
HAPPENING?

4. Its My Painful Experience

5. 1st Email Encryption
- Banyak magic dari copy-paste
- Alur / scoping tidak beraturan

6. 2nd Pesan Antar
- tidak jalan di HP orang lain
- disana force close tapi disini aman

7. 3rd Apps Surveyor Bank
- Terlalu banyak variabel
- UI Logic vs Business Logic

8. Lesson Learned

9. === without builder pattern ===
Personal nasabah = new Personal("joko","sleman","","06/04/80",
"Tempel","40","4","menikah",
"kontrak","3314140604800045","maryani",
"yanik","sri","menikah","laki-laki","08763543","swasta")
==== with builder pattern ===
Personal joko = new Personal.Builder()
.addressByCurrent(addrCurrent)
.addressByKtp(addrKtp)
.children(children)
.gender(gender).build()
=== kotlins world ===
var nasabah = Nasabah(
name = "joko",
statusPasangan = "menikah",
nmrKtp = "3314140604800045",
statusNikah = "menikah"
)
BUILDER
DESIGN PATTERN

10. Sudah punya alt. tanggal?
ya tidak
Tanggal brp?
05/07/80
COMPOSITE
DESIGN PATTERN

11. Sudah punya alt. tanggal?
ya tidak
Tanggal brp?
05/07/80
val q1 = QuestionComponent("berapa umurmu?")
var q2 = QuestionComponent("sudah menikah ?")
var q3 = QuestionComponent("dimana domisilimu");
var q4 = QuestionComponent("berapa penghasilanmu");
q1.addQueastion(q2)
view.showQuestion(q1)
view.showQuestion(q3)
view.showQuestion(q4)

12. Video Call
Engine 1
Video Call
Engine 2
SDK Call Engine
Your Apps Your Apps Your Apps

13. UI
Observer
Pattern
Strategy
pattern
Call Engine 1 Call Engine 2 ...

14. var phoneByWa = WhatsappCallEngine()
var phoneByGoogle = GoogleCallEngine()
var sdk = SDKCallEngine()
sdk.addCallEngine(phoneByWa)
sdk.makeACall()
sdk.closeThePhone()
sdk.addCallEngine(phoneByGoogle)
sdk.makeACall()
sdk.closeThePhone()

15. ConnectionMonitor:Connection
- downloader
=======================
- connecting
- disconnecting
- connected
- disconnected
FasterDownlaoder:Downloader
- connection
=======================
- download
- resume
- cancel
interface Connection
- connecting
- disconnecting
- connected
- disconnected
interface Downloader
- download
- resume
- cancel

16. REPOSITORY
PATTERN