# Swift Algorithm Club: September 2017 Digest

Check out the latest news from the Swift Algorithm club, including big news on the Swift 4 update, and four new submissions! By Kelvin Lau.

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## Swift Algorithm Club: September 2017 Digest

3 mins

The Swift Algorithm Club is a popular open source project to implement popular algorithms and data structures in Swift, with over 14,000 stars on GitHub.

We periodically give status updates with how things are going with the project. This month, we report on our progress with the Swift 4 update.

## Swift 4 Migration – Finished!

I’m happy to announce the Swift Algorithm Club community has successfully merged all 88 articles over to Swift 4!

It made me so happy to see the community working together like this. A big thanks to everyone involved!

## 4 New Submissions

In addition to the Swift 4 update, this month we’re happy to announce 4 new submissions to the Swift Algorithm Club project!

### 1) Minimum Spanning Tree

This month, Vincent Ngo wrote a tutorial on implementing Prim’s Algorithm in Swift. This is a useful algorithm to compute the optimal path from point A to point B in a graph.

### 2) The Egg Drop Problem

The egg drop problem is a popular interview question brought in by Google. Given a couple of very durable eggs, find out which floor will make them crack if you drop the in a building.

Thanks to Arkalyk Akash, the Swift Algorithm Club now includes the Egg Drop Problem in Swift. We hope you enjoy!

### 3) Splay Trees

Splay trees are a special type of self-balancing binary search tree that adjusts itself based on recently accessed values. Every `find`, `insert`, and `remove` operation causes a node to be splayed to the root of the tree.

Want to keep track of the most recently used objects? The splay tree is here for you.

Thanks to Babara Martina, the Swift Algorithm Club now includes a Swift Splay Tree. We hope you enjoy!

### 4) Multiset

Also known as a Bag, the Multiset is a Set that also keeps tracks of the number of times that an element has been inserted. Inserting a value that already exists in the set increments the count of that particular value.

Thanks to Simon Whitaker, the Swift Algorithm Club now includes a Swift Multiset. We hope you enjoy!

## Where To Go From Here?

The Swift Algorithm Club is always looking for new members. Whether you’re here to learn or here to contribute, we’re happy to have you around.

To learn more about the SAC, check out our introductory article. We hope to see you at the club! :]

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