# Memory Management & ARC (iOS)

> ARC, strong/weak/unowned, retain cycles, capture lists, memory leak, profiling

- 22 pertanyaan wawancara
- Senior
- [Pertanyaan Wawancara: iOS](https://sharpskill.dev/id/technologies/ios/pertanyaan-wawancara.md)

## 1. Apa itu ARC (Automatic Reference Counting) di iOS?

**Jawaban**

ARC adalah mekanisme manajemen memori otomatis yang menghitung referensi ke sebuah objek. Compiler secara otomatis menyisipkan pemanggilan retain dan release, menghilangkan manajemen manual. Ketika jumlah referensi mencapai nol, objek dibebaskan (deallocated). ARC sangat menyederhanakan pemrograman iOS dengan mencegah memory leak yang umum.

## 2. Apa itu strong reference di ARC?

**Jawaban**

Strong reference menambah penghitung referensi dari objek yang dirujuk. Secara default, semua variabel adalah strong reference. Objek tetap berada di memori selama setidaknya satu strong reference menunjuk padanya. Menggunakan terlalu banyak strong reference dapat menciptakan retain cycle yang mencegah dealokasi.

## 3. Apa itu retain cycle (siklus retensi)?

**Jawaban**

Retain cycle terjadi ketika dua objek atau lebih saling memegang strong reference. Tidak satu pun yang dapat dibebaskan karena masing-masing mencegah penghitung referensi yang lain mencapai nol. Hal ini menciptakan memory leak. Retain cycle dicegah dengan menggunakan weak atau unowned reference dalam hubungan sirkular.

## 19 pertanyaan lagi tersedia

- Apa peran deinit dalam manajemen memori ARC?
- Apa perbedaan antara weak dan unowned reference?

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