Playgrounds are interactive coding environments that allow developers to write Swift code and see the results immediately without running the project. Playgrounds come bundled with Xcode 6 and support Swift for both iOS and OSX development. Playgrounds provide features like a text editor, quick look previews of values, and value history to visualize how values change over time which make them useful for learning Swift. However, playgrounds can be slow and Xcode crashes sometimes since it was still in beta when the document was written.
This document discusses functions and closures in Swift. It provides examples of defining functions, passing functions as arguments, returning functions from other functions, capturing values from outer scopes within closures, and using lazy initialization to avoid strong reference cycles and memory leaks. Specifically:
1. It shows functions taking other functions as arguments and returning functions.
2. It demonstrates using closures to define functions inline and passing them to other functions.
3. It provides an example of capturing external values within closures and how to avoid strong reference cycles when doing so.
4. It explains how to use lazy initialization with the @lazy property wrapper to lazily initialize properties and avoid memory leaks.
Playgrounds are interactive coding environments that allow developers to write Swift code and see the results immediately without running the project. Playgrounds come bundled with Xcode 6 and support Swift for both iOS and OSX development. Playgrounds provide features like a text editor, quick look previews of values, and value history to visualize how values change over time which make them useful for learning Swift. However, playgrounds can be slow and Xcode crashes sometimes since it was still in beta when the document was written.
This document discusses functions and closures in Swift. It provides examples of defining functions, passing functions as arguments, returning functions from other functions, capturing values from outer scopes within closures, and using lazy initialization to avoid strong reference cycles and memory leaks. Specifically:
1. It shows functions taking other functions as arguments and returning functions.
2. It demonstrates using closures to define functions inline and passing them to other functions.
3. It provides an example of capturing external values within closures and how to avoid strong reference cycles when doing so.
4. It explains how to use lazy initialization with the @lazy property wrapper to lazily initialize properties and avoid memory leaks.