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iOS Swift Collections and Control Flow Control Flow With Conditional Statements Working With Switch Statements

Anusha Singh
Anusha Singh
Courses Plus Student 22,106 Points

Switch statements challenge, please help

In the editor we have a dictionary that contains a three letter country code as a key and that country's capital city as the associated value.

We also have three empty arrays, europeanCapitals, asianCapitals, and otherCapitals. The goal is to iterate through the dictionary and end up with just the names of the capital cities in the relevant array.

For example, after you execute the code you write, europeanCapitals will have the values ["Vaduz", "Brussels", "Sofia"] (not necessarily in that order).

To do this you're going to use a switch statement and switch on the key. For cases where the key is a European country, append the value (not the key!) to the europeanCapitals array. For keys that are Asian countries, append the value to asianCapitals and finally for the default case, append the values to otherCapitals.

That is what they asked, please find the error in my code

var europeanCapitals: [String] = []
var asianCapitals: [String] = []
var otherCapitals: [String] = []

let world = [
  "BEL": "Brussels", 
  "LIE": "Vaduz", 
  "BGR": "Sofia", 
  "USA": "Washington D.C.", 
  "MEX": "Mexico City", 
  "BRA": "Brasilia", 
  "IND": "New Delhi", 
  "VNM": "Hanoi"]

for (key, value) in world {
    // Enter your code below
        switch world {
          case "BEL": europeanCapitals.append("Brussels")
          case "LIE": europeanCapitals.append("Vaduz")
          case "BGR": europeanCapitals.append("Sofia")
          case "IND": asianCapitals.append("New Delhi")
          case "VNM": asianCapitals.append("Hanoi")
          default: otherCapitals.append(value)
    // End code

1 Answer

Dave Harker
Dave Harker
Pro Student 15,510 Points

Hi Soma Singh,

You're going to want to switch on the key and append the value. You appended the value for otherCapitals, you can do that for ALL cases :) rather than re-writing the value strings out

That should be enough to get you through, but if you want the code let me know.
I think you'll find it more fulfilling if you work through it though.

Keep at it and best of luck :dizzy: