Swift

Swift is a powerful and versatile programming language developed by Apple Inc. It was first introduced in 2014 and has since become the primary language for developing applications on Apple's platforms, including iOS, macOS, watchOS, and tvOS. Swift is designed to be easy to read and write, with a focus on performance, safety, and modern programming concepts.

This competency area includes an understanding of the concepts of optionals, closures, generics, extensions, Xcode, and testing.

1. Optionals - Understanding optionals and how to safely unwrap them using techniques like optional binding and nil coalescing.
2. Closures - Familiarity with closures, their syntax, and their usage in Swift. Knowing about capturing values and escaping closures.
3. Generics - Proficiency in using generics for writing flexible and reusable functions and types.
4. Extensions - Learning how to extend existing types (classes, structures, enums) with new functionality using extensions.
5. Xcode - Familiarity with the Xcode development environment, including Interface Builder, debugging tools, and the use of Interface Guidelines.
6. Testing - Understanding how to write unit tests and UI tests using XCTest to ensure code quality.