We extend the networking code from the first episode to support POST requests. Besides using Swift's enums with associated values and generics, we get to implement a map function on a custom data type.
We build a tree structure beginning with a flat array of Ledger account names. We first implement the tree using a class, and then we refactor it to a struct and discuss the differences and tradeoffs involved.
Károly joins us to improve our sorted array implementation from episode #35 using binary search. We benchmark both implementations to learn about their real-world performance.
We build an experimental data type that combines the advantages of both structs and classes. It allows shared mutable state while preserving the features of structs to make easy copies and observe changes.
We refactor our reducer-based project from episode #62 to use The Elm Architecture. Instead of interacting with UIKit directly, we build a virtual view hierarchy and let our Elm framework do the rest.