Notice: Undefined offset: 0 in /var/sites/hackingwithswift.com/site/src/Controller/ExampleCodePageController.php on line 98
What is a dictionary? - free Swift 5.1 example code and tips

NEW: Nominations are now open for the 2019 Swift Community Awards! >>

What is a dictionary?

Swift version: 5.1

Paul Hudson    @twostraws   

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.

SAVE 20% ON iOS CONF SG The largest iOS conference in Southeast Asia is back in Singapore for the 5th time in January 2020, now with two days of workshops plus two days of talks on SwiftUI, Combine, GraphQL, and more! Save a massive 20% on your tickets by clicking on this link.

Available from iOS 7.0 – learn more in my book

Similar solutions…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

MASTER SWIFT NOW
Buy Testing Swift Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let us know!

Average rating: 4.0/5