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

Posted by mathisvaneetvelde
mathisvaneetvelde
9,366 Points

My code could not be compiled

My code could not be compiled and i don't know why. Can anyone show me what is wrong ?

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

1 Answer

Steve Hunter
Steve Hunter
57,712 Points

Hi Mathis,

WHat are you being asked to do here?

One question asks you to set up a variable called ukCurrency.

That would be near to what you have:

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

You've got a removeValueForKey: in there which deletes things. That's why I asked what it is you are trying to do.

Steve.

mathisvaneetvelde
mathisvaneetvelde
9,366 Points

Hi there Steve, This is what they ask: Assign the value for key "UK" to a constant named ukCurrency. But it is right what you said, even doh you didn't know the question. Thank you for your help!

Steve Hunter
Steve Hunter
57,712 Points

Cool - that's what I put above.

First, the dictionary called currencies is created with the key/value pairs for three countries.

Then, ukCurrency is defined as a constant and assigned the value relating to the key "UK". That looks like:

let ukCurrency = currencies["UK"]

I hope that helps!

Steve.