What is a dictionary?
Swift version: 5.1
A dictionary is a collection of values stored at named positions. Whereas you would access values in an array using myArray[5], with a dictionary you use named positions such as myDict["Paul"] or myDict["Scotland"]. You don't even need to use strings for the positions – you can use another object if you choose, such as dates.
These named positions are called "keys", so dictionaries represent what's known as a key-value pair: each key has exactly one value, and each can appear only once in a dictionary.
LEARN SWIFTUI FOR FREE I have a massive, free SwiftUI video collection on YouTube teaching you how to build complete apps with SwiftUI – check it out!
Available from iOS 7.0 – learn more in my book
Similar solutions…
- How to specify default values for dictionary keys
- How to transform a dictionary using mapValues()
- Showing dictionary definitions using UIReferenceLibraryViewController
- How to change your app icon dynamically with setAlternateIconName()
- How to group arrays using dictionaries
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
