What is a dictionary?
Swift version: 5.2
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.
SPONSORED ViRE offers discoverable way of working with regex. It provides really readable regex experience, code complete & cheat sheet, unit tests, powerful replace system, step-by-step search & replace, regex visual scheme, regex history & playground. ViRE is available on Mac & iPad.
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 7.0
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 add a UIApplicationShortcutItem quick action for 3D Touch
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
