PEMROGRAMAN LANJUT Code Smells Bloaters Oleh Politeknik Elektronika

PEMROGRAMAN LANJUT Code Smells: Bloaters Oleh Politeknik Elektronika Negeri Surabaya 2018

Konten • • Code Smells: OVERVIEW Long Parameter List Long Method Large Class Data Clumps Primitive Obsession Percobaan

Code Smells and Refactoring

Bloaters: Long Parameter List build. Customer. Summary(parameter 1, parameter 2, …, parameter n) APA YANG SALAH DALAM POTONGAN KODING INI ? PERUBAHAN APA YANG ANDA LIHAT DIBANDINGKAN DENGAN POTONGAN KODING INI ? 4

BUG ? Technically Incorrect ? CODE SMELL If(Code Smells == Program Error) ? Weakness (Slowdown) Bug. . Bugs. . King of Bugs 5

MASALAH CODE SMELL SOLUSI REFACTORING 6 Refactoring is a controllable process of improving code without creating new functionality. It transforms a mess into clean code and simple design.

When Fixing a Bug Rule of Three When Adding a Feature 7 When to Refactor? During Code Review

Rule of Three When you are doing something for the third time, start refactoring. Refactor 8

Checklist of Refactoring done right way 1. Code should become cleaner. should functionality New 2. during refactoring. Finish all the program functionally first, then do Refactoring! 3. All existing tests must pass after refactoring. 9

Features of Clean Code : 1. 2. 3. 4. 5. 10 Clean Code is obvious for other programmer. Clean Code doesn’t contain duplication. Clean Code contains a minimal number of classes and other moving parts. Clean Code passes all tests Clean Code is easier and cheaper to maintain

Code Smells Couplers Dispensable Change Prventers Bloaters Object Oriented Abuser

Code Smells: Bloaters Long Parameter List Data Clumps Large Class Bloaters Long Method Primitive Obsession

Long Method yang memiliki banyak line ( >10 Lo. C) 15

Contoh Long Method 16

Refactoring Long Method 17

Code Smells: Bloaters Long Parameter List Data Clumps Large Class Bloaters Long Method Primitive Obsession

Contoh Large Class TUGAS CEO 19

Contoh Large Class 20

Refactoring Large Class 21

Refactoring Large Class 22

Refactoring Large Class 23

Code Smells: Bloaters Long Parameter List Data Clumps Large Class Bloaters Long Method Primitive Obsession

Refactoring Primitive Obsession 25

Refactoring Primitive Obsession Contoh 2. Menyimpan data Address dalam bentuk String. Kelemahan. 1. Sulit mendapatkan data spesifik dari Address, misal nama jalan, no. rumah, nama kota. 2. Memerlukan algoritma tambahan untuk mendapatkan data spesifik dari Address. Misal: harus melakukan split String. 26

Refactoring Primitive Obsession 27

Code Smells: Bloaters Long Parameter List Data Clumps Large Class Bloaters Long Method Primitive Obsession

Long Parameter List Method dengan jumlah parameter lebih dari empat. 29

Refactoring Long Parameter List 30

Code Smells: Bloaters Long Parameter List Data Clumps Large Class Bloaters Long Method Primitive Obsession

Data Clumps Sekumpulan data-data sejenis yang cenderung mengelompok di beberapa tempat (class). Kelemahan. Ada kemungkinan data tersebut tidak hanya dibutuhkan pada satu class saja. 32

Contoh Data Clumps 33

Refactoring Data Clumps 34

Refactoring Data Clumps 35

PERCOBAAN

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Referensi • Tutorials. Point, 2017, “Design Pattern”, https: //www. tutorialspoint. com/design_pattern/, (diakses tanggal 24 November 2017) • Java. TPoint, 2017, “MVC Pattern”, http: //www. javatpoint. com/, (diakses tanggal 24 November 2017) • https: //www. youtube. com/watch? v=sz. Ok. Sr. ZGm. HU