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

Gilang Ilhami
Gilang Ilhami
12,045 Points
Posted by Gilang Ilhami
Gilang Ilhami
12,045 Points

Working with statements in Swift, not appending

I already set in the values in the append, but i don't know why it'a not working

operators.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 countyCode {
      case "BEL", "LIE", "BGR": europeanCapitals.append("Brussels", "Vaduz", "Sofia")
      case "IND", "VNM": asianCapitals.append("New Delhi", "Hanoi")
      default: otherCapitals.append("Wahington D.C.", "Mexico City", "Brasilia")
      }
    // End code
}
Roger Rohweder
Roger Rohweder
8,474 Points

I think .append() only works for adding a single element (string). Your sample works for me when I use this instead:

case "BEL", "LIE", "BGR": europeanCapitals += ["Brussels", "Vaduz", "Sofia"]

(see http://stackoverflow.com/questions/24002733/add-an-element-to-an-array-in-swift)

Raghav Sharma
Raghav Sharma
2,207 Points

Here you should append whatever you want in a for loop. You can only append one element.

1 Answer

Abdulwahab Alansari
Abdulwahab Alansari
15,151 Points
Abdulwahab Alansari
Abdulwahab Alansari
15,151 Points

First of all, you are using switch on countyCode, which does not exist in your code, I believe you meant to use "key". Second, you can only use one element in append() function. What's more, instead of listing all capitals in each append() function, just use "value".

You 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 {
    // 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
}
Raghav Sharma
Raghav Sharma
2,207 Points

Yeah that is correct. Nice explanation Abdulwahab Alansari!!