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 halimat yusuf
halimat yusuf
2,290 Points

Create a constant named ukCurrency. Assign the value from the currencies dictionary. Use the key of "UK" to access the v

Create a constant named ukCurrency. Assign the value from the currencies dictionary. Use the key of "UK" to access the value. can't seem to get it right please help

dictionaries.swift 
// country code currency
// or
// key     value
// US      Dollar
// UK      Pound
// JP      Yen

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

let ukCurrency = ["UK"]
currencies["UK"]

1 Answer

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

Hey halimat yusuf,

You're close! You need to write the name of the dictionary before the key you are using to look up the value. This is very similar syntax to using an index of an array. However, instead of using an integer like we do with an array index, we are using the key type for the dictionary, in this case a String. 

// country code currency
// key     value
// US      Dollar
// UK      Pound
// JP      Yen

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

let ukCurrency = currencies["UK"]

Good Luck!

halimat yusuf
halimat yusuf
2,290 Points

thank you