Code Challenge in Collection and Control Flow

Question

Help me! I get stuck here.

switch.swift

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 {

    switch world {
    case "BEL": "Brussels", "LIE": "Vaduz", "BGR": "Sofia" : europeanCapitals.append(value)
    case "IND": "New Delhi", "VNM": "Haoni" : asianCapitals.append(value)
    case "USA": "Washington D.C.", "MEX": "Mexica City", "BRA": "Brasilia" : otherCapitals.append(value)

    }
    // End code
}

Answer 1 · 2016-01-16T18:39:13Z

January 16, 2016 6:39pm

Hey Junsei Tei,

There are a few things we need to correct in your code. First, your switch statement needs to switch on the key value, not world. So you only have to write out the keys in your case statements. Second, you should use a default statement to capture the rest of the remaining keys. This way you don't have to list what those specific keys are. All the values that weren't appended to europeanCapitals or asianCapitals will be appended to otherCapitals by default.

Your code should look like this:

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 {

    switch key {
    case "BEL", "LIE", "BGR": europeanCapitals.append(value)
    case "IND", "VNM": asianCapitals.append(value)
    default: otherCapitals.append(value)

    }
    // End code
}

Hope this helps! Good luck!

Answer 2 · 2016-01-16T18:33:25Z

January 16, 2016 6:33pm

You're switching on the world dictionary, but that is a dictionary of country codes and capitals. What you're interested in is switching on the country codes. As you iterate through the for loop the country codes will be stored in the constant named key.

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JUNSEI TEI

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Code Challenge in Collection and Control Flow

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Steven Deutsch

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Emil Rais

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