🍫 Iterator Pattern
Tags: swift, programming, computerscience, architecture
Published: 2022-12-13 17:21:51


![Iterator Pattern](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/nqx1rxjkimlhmmo0e5zy.png)

---

The iterator pattern is used to provide a standard interface for traversing a collection of items in an aggregate object without the need to understand its underlying structure.

Github https://github.com/sergeyleschev/design-patterns

**Example**:
```swift
struct Novella {
    let name: String
}

struct Novellas {
    let novellas: [Novella]
}

struct NovellasIterator: IteratorProtocol {

    private var current = 0
    private let novellas: [Novella]

    init(novellas: [Novella]) {
        self.novellas = novellas
    }

    mutating func next() -> Novella? {
        defer { current += 1 }
        return novellas.count > current ? novellas[current] : nil
    }
}

extension Novellas: Sequence {
    func makeIterator() -> NovellasIterator {
        return NovellasIterator(novellas: novellas)
    }
}
```
**Usage**
```swift
let greatNovellas = Novellas(novellas: [Novella(name: "The Mist")] )
for novella in greatNovellas {
    print("I've read: \(novella)")
}
```
Sources: Github
> **_Behavioral_**
In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication.
Source: [wikipedia.org](https://en.wikipedia.org/wiki/Behavioral_pattern)

---

🐝 [Chain Of Responsibility](https://dev.to/sergeyleschev/swift-design-patterns-chain-of-responsibility-4bbd)
👫 [Command Pattern](https://dev.to/sergeyleschev/swift-design-patterns-command-pattern-3044)
🎶 [Interpreter Pattern](https://dev.to/sergeyleschev/swift-design-patterns-interpreter-pattern-390a)
🍫 [Iterator Pattern](https://dev.to/sergeyleschev/swift-design-patterns-iterator-pattern-405o)
💐 [Mediator Pattern](https://dev.to/sergeyleschev/swift-design-patterns-mediator-pattern-4299)
💾 [Memento Pattern](https://dev.to/sergeyleschev/swift-design-patterns-memento-pattern-chp)
👓 [Observer Pattern](https://dev.to/sergeyleschev/swift-design-patterns-observer-pattern-44fc)
🐉 [State Pattern](https://dev.to/sergeyleschev/swift-design-patterns-state-pattern-5ej4)
💡 [Strategy Pattern](https://dev.to/sergeyleschev/swift-design-patterns-strategy-pattern-143c)
📝 [Template Method](https://dev.to/sergeyleschev/swift-design-patterns-template-method-1c2o)
🏃 [Visitor Pattern](https://dev.to/sergeyleschev/swift-design-patterns-visitor-pattern-4hl5)
🌰 [Abstract Factory](https://dev.to/sergeyleschev/swift-design-patterns-abstract-factory-3ppa)
👷 [Builder Pattern](https://dev.to/sergeyleschev/swift-design-patterns-builder-pattern-3609)
🏭 [Factory Method](https://dev.to/sergeyleschev/swift-design-patterns-factory-method-5c6e)
🔂 [Monostate Pattern](https://dev.to/sergeyleschev/swift-design-patterns-monostate-pattern-574i)
🃏 [Prototype Pattern](https://dev.to/sergeyleschev/swift-design-patterns-prototype-pattern-n25)
💍 [Singleton](https://dev.to/sergeyleschev/swift-design-patterns-singleton-3c8b)
🔌 [Adapter Pattern](https://dev.to/sergeyleschev/swift-design-patterns-adapter-pattern-1040)
🌉 [Bridge Pattern](https://dev.to/sergeyleschev/swift-design-patterns-bridge-pattern-1ee2)
🌿 [Composite Pattern](https://dev.to/sergeyleschev/swift-design-patterns-composite-pattern-1koj)
🍧 [Decorator Pattern](https://dev.to/sergeyleschev/swift-design-patterns-decorator-pattern-2c6p)
🎁 [Facade Pattern](https://dev.to/sergeyleschev/swift-design-patterns-facade-pattern-130a)
🍃 [Flyweight Pattern](https://dev.to/sergeyleschev/swift-design-patterns-flyweight-pattern-6ko)
☔ [Protection Proxy](https://dev.to/sergeyleschev/swift-design-patterns-protection-proxy-3kpc)
🍬 [Virtual Proxy](https://dev.to/sergeyleschev/swift-design-patterns-virtual-proxy-2bbg)

---

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