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iOS Swift Collections and Control Flow Dictionaries in Swift Working With Dictionaries

Jonathan Boisvert
Jonathan Boisvert
4,582 Points
Posted by Jonathan Boisvert
Jonathan Boisvert
4,582 Points

assigning a constant to a value for a Key

I am having trouble with the syntax of changing a value to a constant in the dictionary

dictionary.swift 
var iceCream = [ "CC": "Chocolate Chip", "AP": "Apple Pie", "PB": "Peanut Butter"]
iceCream ["RR"] = "Rocky Road"
iceCream.updateValue["applePie",  forKey: "AP"]

1 Answer

Thomas Dobson
Thomas Dobson
7,511 Points
Thomas Dobson
Thomas Dobson
7,511 Points

Hi Jonathan,

Lets break this down:

var iceCream = [ "CC": "Chocolate Chip", "AP": "Apple Pie", "PB": "Peanut Butter"] //setting up the array
iceCream ["RR"] = "Rocky Road" //Adding Rocky Road for key RR
let applePie = iceCream["AP"] //Read key AP, set that keys value to a constant called applePie
iceCream.updateValue("Chocolate Chip Cookie Dough", forKey: "CC") //update key CC with the value of Chocolate chip Cookie Dough

There is some good reading on Arrays in Apple's Collection Types Docs

I hope that helps!