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

Posted by shane reichefeld
shane reichefeld
Courses Plus Student 2,232 Points

i dont know what to do or why im wrong?

please help

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 world{
    case "BEL": europeanCapitals.append("Brussels")
    case "LIE": europeanCapitals.append("Vaduz")
    case "BGR": europeanCapitals.append("Sofia")
    default "USA": otherCapitals.append("Washington D.C.")
    default "MEX": otherCapitals.append("Mexico City")
    default "BRA": otherCapitals.append("Brasilia")
    case "IND": asianCapitals.append("New Delhi")
    case "VNM": asianCapitals.append("Hanoi")
    }
    // End code
}

1 Answer

Jennifer Nordell
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STAFF
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Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

First you're supposed to switch on key. Secondly, your code can be optimized somewhat. Currently you're switching on world. So what you're really saying is when "world" is equal to "IND" append "New Delhi" which is not what you're after exactly. Here's my final code. Hope it clarifies things a bit.

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", "BGR", "LIE":
        europeanCapitals.append(value)
      case "IND", "VNM":
        asianCapitals.append(value)
      default:
        otherCapitals.append(value)
    }  
    // End code
}

Here, I'm saying if the key is "BEL" or "BGR" or "LIE" put the value (ie "Brussels") into the europeanCapitals array. Then I go through the asian capitals. And finally everyone else gets put in otherCapitals. Happy coding!