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Commonly used sequence and collection algorithms for Swift

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Top Related Projects

Algorithms and data structures in Swift, with explanations!

📖 Design Patterns implemented in Swift 5.0

A curated list of awesome iOS ecosystem, including Objective-C and Swift Projects

A collaborative list of awesome Swift libraries and resources. Feel free to contribute!

swift implementation of flappy bird. More at fullstackedu.com

Quick Overview

Swift Algorithms is a package of sequence and collection algorithms, along with their related types. It provides a set of powerful, generic algorithms that extend the Swift standard library, offering efficient and reusable solutions for common programming tasks involving sequences and collections.

Pros

  • Enhances the Swift standard library with a wide range of useful algorithms
  • Well-documented and thoroughly tested implementations
  • Designed with performance in mind, optimized for various use cases
  • Seamlessly integrates with existing Swift code and follows Swift's naming conventions

Cons

  • May introduce dependencies in projects that could otherwise rely solely on the standard library
  • Some algorithms might have a learning curve for developers unfamiliar with more advanced concepts
  • Could potentially overlap with custom implementations in existing codebases

Code Examples

  1. Chunking a sequence:
let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
for chunk in numbers.chunks(ofCount: 3) {
    print(chunk)
}
// Prints:
// [1, 2, 3]
// [4, 5, 6]
// [7, 8, 9]
// [10]
  1. Finding the first unique element:
let words = ["apple", "banana", "apple", "cherry", "date", "banana"]
if let firstUnique = words.firstUnique() {
    print("The first unique word is: \(firstUnique)")
}
// Prints: The first unique word is: cherry
  1. Generating permutations:
let letters = ["A", "B", "C"]
for permutation in letters.permutations() {
    print(permutation.joined())
}
// Prints:
// ABC
// ACB
// BAC
// BCA
// CAB
// CBA

Getting Started

To use Swift Algorithms in your project, add it as a dependency in your Package.swift file:

dependencies: [
    .package(url: "https://github.com/apple/swift-algorithms.git", from: "1.0.0")
]

Then, import the module in your Swift files:

import Algorithms

Now you can use the algorithms provided by the package in your code.

Competitor Comparisons

Algorithms and data structures in Swift, with explanations!

Pros of swift-algorithm-club

  • Broader coverage of algorithms and data structures
  • Includes explanations and step-by-step tutorials for each implementation
  • Community-driven project with contributions from various developers

Cons of swift-algorithm-club

  • Less official support and maintenance compared to Swift Algorithms
  • May not always be up-to-date with the latest Swift language features
  • Implementations might not be as optimized or performance-focused

Code Comparison

Swift Algorithms:

let numbers = [1, 2, 3, 4, 5]
let combinations = numbers.combinations(ofCount: 3)
print(Array(combinations))

swift-algorithm-club:

let numbers = [1, 2, 3, 4, 5]
let combinations = numbers.combinations(3)
print(combinations)

Both repositories provide implementations for common algorithms and data structures in Swift. Swift Algorithms is an official Apple project, focusing on production-ready, performant implementations that integrate seamlessly with the Swift Standard Library. swift-algorithm-club, on the other hand, offers a wider range of algorithms with detailed explanations, making it an excellent learning resource for developers. While Swift Algorithms may have more optimized code, swift-algorithm-club provides a broader scope and educational value.

📖 Design Patterns implemented in Swift 5.0

Pros of Design-Patterns-In-Swift

  • Focuses on design patterns, providing practical examples for Swift developers
  • Includes a wide range of design patterns with clear explanations
  • Serves as an educational resource for learning software design principles

Cons of Design-Patterns-In-Swift

  • Less frequently updated compared to swift-algorithms
  • Not officially maintained by Apple, potentially less aligned with Swift's evolution
  • May not offer the same level of performance optimizations as swift-algorithms

Code Comparison

Design-Patterns-In-Swift (Singleton pattern):

class Singleton {
    static let sharedInstance = Singleton()
    private init() {}
}

swift-algorithms (Binary search):

extension Collection where Element: Comparable {
    func binarySearch(for element: Element) -> Index? {
        // Implementation details
    }
}

Summary

Design-Patterns-In-Swift is an excellent resource for learning and implementing design patterns in Swift, making it valuable for educational purposes and improving code architecture. However, swift-algorithms focuses on providing efficient algorithmic implementations, which may be more beneficial for performance-critical applications. The choice between the two depends on the specific needs of the project and the developer's learning goals.

A curated list of awesome iOS ecosystem, including Objective-C and Swift Projects

Pros of awesome-ios

  • Comprehensive collection of iOS development resources, libraries, and tools
  • Regularly updated with community contributions
  • Covers a wide range of topics beyond algorithms

Cons of awesome-ios

  • Not focused on providing actual code implementations
  • May include outdated or less maintained projects

Code comparison

swift-algorithms:

extension Collection where Element: Comparable {
    func firstIndex(of element: Element) -> Index? {
        return firstIndex(where: { $0 >= element })
    }
}

awesome-ios:

## Animation
* [lottie-ios](https://github.com/airbnb/lottie-ios) - An iOS library to natively render After Effects vector animations
* [Keyframes](https://github.com/facebookincubator/Keyframes) - A library for converting Adobe AE shape based animations to a data format and play it back on Android and iOS devices

Key differences

  • swift-algorithms focuses on providing efficient algorithm implementations for Swift
  • awesome-ios is a curated list of resources, not a code library
  • swift-algorithms is maintained by Apple, ensuring high-quality and up-to-date code
  • awesome-ios offers a broader scope of iOS development topics
  • swift-algorithms is more suitable for developers looking for specific algorithm implementations
  • awesome-ios is better for discovering new tools and libraries for iOS development

A collaborative list of awesome Swift libraries and resources. Feel free to contribute!

Pros of awesome-swift

  • Comprehensive collection of Swift resources, libraries, and tools
  • Community-driven with frequent updates and contributions
  • Covers a wide range of topics beyond algorithms

Cons of awesome-swift

  • Not focused on algorithms specifically
  • May include outdated or less maintained projects
  • Lacks in-depth explanations or implementations

Code comparison

swift-algorithms:

extension Collection where Element: Comparable {
    func insertionSort() -> [Element] {
        var array = Array(self)
        for i in 1..<array.count {
            let key = array[i]
            var j = i - 1
            while j >= 0 && array[j] > key {
                array[j + 1] = array[j]
                j -= 1
            }
            array[j + 1] = key
        }
        return array
    }
}

awesome-swift:

// No direct code examples provided
// The repository is a curated list of resources
// Users would need to follow links to find code examples

Summary

swift-algorithms focuses on providing efficient, well-tested algorithm implementations for Swift, while awesome-swift serves as a comprehensive directory of Swift-related resources. swift-algorithms is more suitable for developers looking for specific algorithm implementations, whereas awesome-swift is better for discovering a wide range of Swift tools, libraries, and learning materials.

swift implementation of flappy bird. More at fullstackedu.com

Pros of FlappySwift

  • Provides a complete, playable game implementation
  • Serves as a practical example of game development in Swift
  • Offers a fun, interactive way to learn Swift programming

Cons of FlappySwift

  • Limited in scope to a single game implementation
  • Less focus on reusable algorithms and data structures
  • May not be as actively maintained or updated

Code Comparison

FlappySwift (game logic):

func update() {
    bird.physicsBody?.velocity = CGVector(dx: 0, dy: bird.physicsBody!.velocity.dy)
    bird.physicsBody?.applyImpulse(CGVector(dx: 0, dy: 30))
}

swift-algorithms (algorithm implementation):

public struct Permutations<Base: Collection> {
  public let base: Base
  public init(_ base: Base) { self.base = base }
}

Summary

FlappySwift is a specific game implementation, providing a hands-on example of Swift game development. It's great for learning game programming but limited in scope. swift-algorithms, on the other hand, offers a comprehensive collection of reusable algorithms and data structures, making it more versatile for general Swift development. The code comparison highlights this difference, with FlappySwift focusing on game mechanics and swift-algorithms on abstract algorithm implementation.

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README

Swift Algorithms

Swift Algorithms is an open-source package of sequence and collection algorithms, along with their related types.

Overview

The Algorithms package provides a variety of sequence and collection operations, letting you cycle over a collection's elements, find combinations and permutations, create a random sample, and more.

For example, the package includes a group of "chunking" methods, each of which breaks a collection into consecutive subsequences. One version tests adjacent elements to find the breaking point between chunks — you can use it to quickly separate an array into ascending runs:

let numbers = [10, 20, 30, 10, 40, 40, 10, 20]
let chunks = numbers.chunked(by: { $0 <= $1 })
// [[10, 20, 30], [10, 40, 40], [10, 20]]

Another version looks for a change in the transformation of each successive value. You can use that to separate a list of names into groups by the first character:

let names = ["Cassie", "Chloe", "Jasmine", "Jordan", "Taylor"]
let chunks = names.chunked(on: \.first)
// [["Cassie", "Chloe"], ["Jasmine", "Jordan"], ["Taylor"]]

Explore more chunking methods and the remainder of the Algorithms package in the links below.

Documentation

For API documentation, see the library's official documentation in Xcode or on the Web.

Adding Swift Algorithms as a Dependency

To use the Algorithms library in a SwiftPM project, add the following line to the dependencies in your Package.swift file:

.package(url: "https://github.com/apple/swift-algorithms", from: "1.2.0"),

Include "Algorithms" as a dependency for your executable target:

.target(name: "<target>", dependencies: [
    .product(name: "Algorithms", package: "swift-algorithms"),
]),

Finally, add import Algorithms to your source code.

Source Stability

The Swift Algorithms package is source stable; version numbers follow Semantic Versioning. Source breaking changes to public API can only land in a new major version.

The public API of the swift-algorithms package consists of non-underscored declarations that are marked public in the Algorithms module. Interfaces that aren't part of the public API may continue to change in any release, including patch releases.

Future minor versions of the package may introduce changes to these rules as needed.

We'd like this package to quickly embrace Swift language and toolchain improvements that are relevant to its mandate. Accordingly, from time to time, we expect that new versions of this package will require clients to upgrade to a more recent Swift toolchain release. Requiring a new Swift release will only require a minor version bump.