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

unable to solve challenge task 2.2 Dictionary.

I give... I understand my attempt will not work because currencies is a constant. The only other answer I can think of is let ukCurrency = ["UK": "Pound"] This didn't work either I guess because "UK" is already used. Is there a way to change a constant to a variable?

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

1 Answer

Anthony, it seems that you have just used the wrong method to retrieve the value for the key.

Swift:

let ukCurrency = currencies["UK"]

Objective C:

NSString *ukCurrency = [currencies objectForKey:@"UK"];

Remember, in Objective-C you will need to use the method (objectForKey) to access a value given the key.

If you have any questions, feel free to ask!