Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Swift Basics (retired) Collections What is a Dictionary?

Posted by Tiffany Kang
Tiffany Kang
654 Points

How do I define 'currencies' as a constant?

I tried following the video, but it shows that I have an error. What am I doing wrong?

dictionaries.swift 
var currencies = ["US":"Dollar", "UK":"Pound", "JP":"Yen"]
let ukCurrency = currencies.removeValueForKey("UK")

2 Answers

kirkbyo
kirkbyo
15,791 Points
kirkbyo
kirkbyo
15,791 Points

Hey Tiffany,

You don't need to remove the value from the array, you can just do something like this instead. 

let currencies = ["US":"Dollar", "UK":"Pound", "JP":"Yen"]
let ukCurrency = currencies["UK"]

Hope this helped,

Ozzie

John Sanchez
John Sanchez
3,325 Points
John Sanchez
John Sanchez
3,325 Points

To define something as a constant instead of a variable, use the keyword "let" instead of "var".

let currencies = ____

Tiffany Kang
Tiffany Kang
654 Points

I tried that and now it says the code could not be compiled.