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Here you'll find implementations of popular algorithms and data structures in everyone's favorite new language Swift, with detailed explanations of how they work.
If you're a computer science student who needs to learn this stuff for exams -- or if you're a self-taught programmer who wants to brush up on the theory behind your craft -- you've come to the right place!
The goal of this project is to explain how algorithms work. The focus is on clarity and readability of the code, not on making a reusable library that you can drop into your own projects. That said, most of the code should be ready for production use but you may need to tweak it to fit into your own codebase.
Code is compatible with Xcode 10 and Swift 4.2. We'll keep this updated with the latest version of Swift. If you're interested in a GitHub pages version of the repo, check out this.
😍 Suggestions and contributions are welcome! 😍
What are algorithms and data structures? Pancakes!
Why learn algorithms? Worried this isn't your cup of tea? Then read this.
Big-O notation. We often say things like, "This algorithm is O(n)." If you don't know what that means, read this first.
Algorithm design techniques. How do you create your own algorithms?
How to contribute. Report an issue to leave feedback, or submit a pull request.
If you're new to algorithms and data structures, here are a few good ones to start out with:
It's fun to see how sorting algorithms work, but in practice you'll almost never have to provide your own sorting routines. Swift's own
sort() is more than up to the job. But if you're curious, read on...
Bad sorting algorithms (don't use these!):
The choice of data structure for a particular task depends on a few things.
First, there is the shape of your data and the kinds of operations that you'll need to perform on it. If you want to look up objects by a key you need some kind of dictionary; if your data is hierarchical in nature you want a tree structure of some sort; if your data is sequential you want a stack or queue.
Second, it matters what particular operations you'll be performing most, as certain data structures are optimized for certain actions. For example, if you often need to find the most important object in a collection, then a heap or priority queue is more optimal than a plain array.
Most of the time using just the built-in
Set types is sufficient, but sometimes you may want something more fancy...
Like what you see? Check out Data Structures & Algorithms in Swift, the official book by the Swift Algorithm Club team!
Youll start with the fundamental structures of linked lists, queues and stacks, and see how to implement them in a highly Swift-like way. Move on to working with various types of trees, including general purpose trees, binary trees, AVL trees, binary search trees, and tries.
Go beyond bubble and insertion sort with better-performing algorithms, including mergesort, radix sort, heap sort, and quicksort. Learn how to construct directed, non-directed and weighted graphs to represent many real-world models, and traverse graphs and trees efficiently with breadth-first, depth-first, Dijkstras and Prims algorithms to solve problems such as finding the shortest path or lowest cost in a network.
By the end of this book, youll have hands-on experience solving common issues with data structures and algorithms and youll be well on your way to developing your own efficient and useful implementations!
You can find the book on the raywenderlich.com store.
The Swift Algorithm Club was originally created by Matthijs Hollemans.
All content is licensed under the terms of the MIT open source license.
By posting here, or by submitting any pull request through this forum, you agree that all content you submit or create, both code and text, is subject to this license. Razeware, LLC, and others will have all the rights described in the license regarding this content. The precise terms of this license may be found here.