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

Difference between constant and variable in this context.

I'm wondering if this is a bug, I've posted about it previously but the response solutions do not work in the exercise.

If you try this exercise and create a constant with the dictionary as requested and then go to the next exercise (which builds on this), it simply will not work.

There is a working solution of course - and that is to make the constant a variable (for the dictionary).

Does this work as a constant for anyone?

dictionaries.swift

1 Answer

Jason Anders
MOD
Jason Anders
Treehouse Moderator 145,860 Points

The challenge that you are linking from, I think you may be misunderstanding the 2nd Task. You're not actually building on the constant created in Task one. The challenge wants you create a new constant and assign a value pulled from the dictionary created prior.

So, the completed code for the second task is as follows:

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

let ukCurrency = currencies["UK"]

Have a look and see if it makes sense. Task one creates the Dictionary and Task two pulls a value from it using a Key.

:dizzy: