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

Ling Cheng
Ling Cheng
3,168 Points
Posted by Ling Cheng
Ling Cheng
3,168 Points

how can I Assign the value for key "UK" to a constant named ukCurrency when it is constant?

I tried on Xcode, if var currencies works, but now is a constant, how can I work this out ? thanks!

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

3 Answers

William Li
PLUS
William Li
Courses Plus Student 26,868 Points
William Li
William Li
Courses Plus Student 26,868 Points

Hi, Ling.

No, you don't need to remove anything from the dictionary. What part 2 asks you to do are couple things

  1. retrieve the value of "UK" key from currencies dictionary.
  2. assign that value to a new constant named ukCurrency 
let currencies = ["US": "Dollar", "UK": "Pound", "JP": "Yen"]
let ukCurrency = currencies["UK"]
Holger Liesegang
Holger Liesegang
50,595 Points
Holger Liesegang
Holger Liesegang
50,595 Points

Hi Ling,

you get the value for the key "UK" in the dictionary currencies like this: currencies["UK"]

let currencies = ["US": "Dollar", "UK": "Pound", "JP": "Yen"]
let ukCurrency = currencies["UK"]
Ling Cheng
Ling Cheng
3,168 Points
Ling Cheng
Ling Cheng
3,168 Points

Oh,...thanks both!! I was thinking too much....need to study more, thanks !