# Dasar-Dasar Ruby (Ruby on Rails)

> Variabel, tipe data, control flow, method, blocks, procs, lambdas

- 25 pertanyaan wawancara
- Junior
- [Pertanyaan Wawancara: Ruby on Rails](https://sharpskill.dev/id/technologies/ruby-on-rails/pertanyaan-wawancara.md)

## 1. Apa perbedaan antara variabel lokal dan variabel instance di Ruby?

**Jawaban**

Variabel lokal dimulai dengan huruf kecil atau underscore dan hanya dapat diakses dalam scope-nya (method atau block). Variabel instance dimulai dengan @ dan dapat diakses di semua method objek, bertahan sepanjang masa hidup instance. Perbedaan ini sangat penting untuk pengelolaan state pada objek Ruby.

## 2. Bagaimana cara mendeklarasikan konstanta di Ruby dan apa konvensi penamaannya?

**Jawaban**

Di Ruby, sebuah konstanta dideklarasikan menggunakan nama yang dimulai dengan huruf kapital. Berdasarkan konvensi, konstanta ditulis dalam SCREAMING_SNAKE_CASE (mis: MAX_SIZE = 100). Ruby menampilkan warning jika sebuah konstanta diubah, tetapi tidak mencegahnya tidak seperti bahasa lain.

## 3. Apa hasil dari ekspresi 5 / 2 di Ruby dan bagaimana cara mendapatkan hasil desimal?

**Jawaban**

Di Ruby, pembagian antara dua bilangan bulat (Integer) menghasilkan bilangan bulat (5 / 2 = 2). Untuk mendapatkan hasil desimal, setidaknya salah satu operand harus berupa Float: 5.0 / 2 atau 5 / 2.0 atau 5.to_f / 2. Aturan ini mengikuti prinsip pembagian bilangan bulat yang ada di banyak bahasa.

## 22 pertanyaan lagi tersedia

- Apa perbedaan antara Symbol (:name) dan String ("name") di Ruby?
- Bagaimana cara kerja interpolasi string di Ruby?

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## Topik wawancara Ruby on Rails lainnya

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- [Deployment & Produksi](https://sharpskill.dev/id/technologies/ruby-on-rails/pertanyaan-wawancara/rails-deployment-production.md): 20 pertanyaan, Senior
- [Monitoring & Logging](https://sharpskill.dev/id/technologies/ruby-on-rails/pertanyaan-wawancara/monitoring-logging.md): 20 pertanyaan, Senior
- [Strategi Upgrade Rails](https://sharpskill.dev/id/technologies/ruby-on-rails/pertanyaan-wawancara/rails-upgrade-strategies.md): 18 pertanyaan, Senior

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