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

Posted by Mark Shim
Mark Shim
Courses Plus Student 512 Points

Dictionary code

I'm stuck on a Dictionary code

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

let ukCurrency = ["UK": "ukCurrency"]
Meek D
Meek D
3,457 Points

what is the question ?

3 Answers

Jason Edstrom
Jason Edstrom
8,976 Points
Jason Edstrom
Jason Edstrom
8,976 Points

Currencies is a dictionary which uses key/value pairs. Try referencing it this way:

let ukCurrency = currencies["UK"]

In this situation, your abbreviations are your keys and the currency is the value. You can use one to reference the other in a more specific way than calling an index number like with Arrays (I.E. currencies[1]).

For example: if I have:

let  stuff = ["Things": "More Stuff"];

and I wanted to know what the value of "Things", I would do this:

let valueOfThings = stuff["Things"];

The value would of valueOfThings would be "More Stuff".

John Stephanites
John Stephanites
2,007 Points
John Stephanites
John Stephanites
2,007 Points

Actually does work. I have been trying this for awhile because I felt like it was correct. Come to find out I spelled currencies wrong!!!!!!!!!