Control dependencies with structs in Swift

Dependencies are essential elements of your codebase. They allow us to delegate tasks, improve modularity, and replace certain components in tests. Adding dependency injection helps us achieve the ultimate goal: easy and consistent replacement of code implementation.

protocol HTTPClient {}
class URLSessionHTTPClient: HTTPClient {} // live
class SpyHTTPClient: HTTPClient {} // mock

Swift developers are familiar with libraries to manage dependencies, like Swinject or Needle. They can easily be found on Github. However, my question is: do these libraries …

class code codebase components control dependencies dependency developers easy goal implementation injection ios live macos protocol swift tests