# Smart Pointers (Rust)

> Box<T>, Rc<T>, Arc<T>, RefCell<T>, interior mutability, trait Deref dan Drop

- 22 pertanyaan wawancara
- Mid-Level
- [Pertanyaan Wawancara: Rust](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara.md)

## 1. Apa kasus penggunaan utama Box<T> di Rust?

**Jawaban**

Box<T> mengalokasikan data di heap alih-alih stack. Ini berguna untuk tipe yang ukurannya tidak diketahui saat compile time (tipe rekursif), untuk memindahkan ownership data besar tanpa menyalin, atau untuk membuat trait object. Pointer Box itu sendiri memiliki ukuran tetap di stack.

## 2. Bagaimana cara mendefinisikan tipe rekursif seperti linked list di Rust?

**Jawaban**

Tipe rekursif langsung seperti enum List { Cons(i32, List), Nil } tidak dapat dikompilasi karena compiler tidak dapat menentukan ukurannya. Menggunakan Box<List> menciptakan indirection dengan ukuran tetap (pointer), sehingga compiler dapat menghitung ukuran tipe tersebut.

## 3. Apa perbedaan utama antara Rc<T> dan Arc<T>?

**Jawaban**

Rc (Reference Counted) menggunakan penghitung referensi non-atomik, sehingga lebih cepat tetapi terbatas pada satu thread. Arc (Atomically Reference Counted) menggunakan operasi atomik untuk penghitungnya, memungkinkan berbagi antar thread tetapi dengan sedikit overhead performa.

## 19 pertanyaan lagi tersedia

- Apa yang dimungkinkan oleh trait Deref di Rust?
- Apa itu interior mutability di Rust?

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## Topik wawancara Rust lainnya

- [Dasar-Dasar Rust](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/rust-basics.md): 25 pertanyaan, Junior
- [Ownership & Borrowing](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/ownership-borrowing.md): 22 pertanyaan, Junior
- [Structs & Enums](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/structs-enums.md): 20 pertanyaan, Junior
- [Penanganan Error](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/error-handling.md): 18 pertanyaan, Junior
- [Collections](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/collections.md): 20 pertanyaan, Junior
- [Module & Package](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/modules-packages.md): 18 pertanyaan, Junior
- [Traits](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/traits.md): 22 pertanyaan, Mid-Level
- [Generics](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/generics.md): 20 pertanyaan, Mid-Level
- [Lifetimes](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/lifetimes.md): 20 pertanyaan, Mid-Level
- [Iterators & Closures](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/iterators-closures.md): 22 pertanyaan, Mid-Level
- [Concurrency Basics](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/concurrency-basics.md): 20 pertanyaan, Mid-Level
- [async/await](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/async-await.md): 22 pertanyaan, Mid-Level
- [Testing](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/testing.md): 18 pertanyaan, Mid-Level
- [Cargo & Ecosystem](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/cargo-ecosystem.md): 18 pertanyaan, Mid-Level
- [Pattern Matching](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/pattern-matching.md): 18 pertanyaan, Mid-Level
- [Macro](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/macros.md): 20 pertanyaan, Mid-Level
- [Serde & Serialisasi](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/serde-serialization.md): 20 pertanyaan, Mid-Level
- [Unsafe Rust](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/unsafe-rust.md): 20 pertanyaan, Senior
- [Trait Lanjutan](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/advanced-traits.md): 22 pertanyaan, Senior
- [Lifetime Lanjutan](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/advanced-lifetimes.md): 20 pertanyaan, Senior
- [Type System](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/type-system.md): 20 pertanyaan, Senior
- [Tokio & Async I/O](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/tokio-async.md): 22 pertanyaan, Senior
- [Optimasi Performa](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/performance-optimization.md): 20 pertanyaan, Senior
- [Memory Management](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/memory-management.md): 20 pertanyaan, Senior
- [Web Frameworks](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/web-frameworks.md): 22 pertanyaan, Senior
- [Database Integration](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/database-integration.md): 20 pertanyaan, Senior
- [Design Pattern Rust](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara/design-patterns.md): 20 pertanyaan, Senior

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