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iOS Swift 2.0 Collections and Control Flow Control Flow With Conditional Statements Working with Switch Statements

Posted by Ben Forrester
Ben Forrester
Courses Plus Student 5,357 Points

syntax error or geographical error?

Bummer! Remember to append the values from each case statement to the correct array.

Here is the 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 key {
    case "BEL": europeanCapitals += ["Brussels"]
    case "LIE": europeanCapitals += ["Vaduz"]
    case "BGR": europeanCapitals += ["Sofia"]
    case "IND": asianCapitals += ["New Delhi"]
    case "VNM": asianCapitals += ["Hanoi"]
    default: otherCapitals += [value]
    }
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 {
    // Enter your code below
    switch key {
    case "BEL": europeanCapitals += ["Brussels"]
    case "LIE": europeanCapitals += ["Vaduz"]
    case "BGR": europeanCapitals += ["Sofia"]
    case "IND": asianCapitals += ["New Delhi"]
    case "VNM": asianCapitals += ["Hanoi"]
    default: otherCapitals += [value]
    // End code
}

2 Answers

jcorum
jcorum
71,816 Points
jcorum
jcorum
71,816 Points

Ben, interesting. Your code looked good. So just to see what I'd missed I copied it into a playground and it ran fine! It looks like this is an issue with Treehouse. Just as a side comment, you can save a few keystrokes if you combine the cases:

for (key, value) in world {
    // Enter your code below
    switch key {
    case "BEL", "LIE", "BGR": europeanCapitals += [value]
    case "IND", "VNM": asianCapitals += [value]
    default: otherCapitals += [value]
    }
    // End code
}

This gets the same error you do in Treehouse, but runs fine in Xcode. Sometimes it's just an unwanted space in Treehouse, so I tried a few variants, but no go. But Preview now shows no errors, either for your original or my revision.

Tobias Helmrich
Tobias Helmrich
31,602 Points
Tobias Helmrich
Tobias Helmrich
31,602 Points

Hey there,

actually the code should work and you already got an improved version of it. However I tried using the append method instead of the addition assignment operator and then it passed. So I guess that's an error with Treehouse because it only accepts the append method even though the addition assignment operator should be fine as well.

This is working:

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

I hope that helps! :)