Swift 4 Recipes: Hundreds of Useful Hand-picked Code Snippets

© Yanis Zafirópulos 2019

Yanis ZafirópulosSwift 4 Recipeshttps://doi.org/10.1007/978-1-4842-4182-0_9

9. Dictionaries

Yanis Zafirópulos¹ 

(1)

Granada, Spain

 

In programming, a dictionary is a general-purpose data structure, used to store a group of objects, in a “real” dictionary-like lemma-definition approach - or as group of key-value pairs, properly put.

In this chapter, we’ll explore most of Swift’s dictionary-related capabilities and learn how to create new ones, add/remove keys, merge them, and move on to even more advanced topics, such as handling property lists.

9.1 Add key-value pair to dictionary

Problem

I want to add a key-value pair to an existing dictionary

Solution

Let’s initialize our test dictionary.

var user = [

      "name"         : "John", ...