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

Posted by Dan B
Dan B
527 Points

Default triggered in switches

I successfully completed this task. However, when I run this in Xcode, the default case--which I set to print(error)--is also triggered once in the debugger as the last iteration of the loop. Since all the keys in the world array have their counterparts in the three different cases, I cannot figure out why or how the default case is being triggered.

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 key {
    case "BEL", "LIE", "BRG": europeanCapitals.append(value)
    case "USA", "MEX", "BRA": otherCapitals.append(value)
    case "IND", "VNM": asianCapitals.append(value)
    default: print("error")
    // End code
}

1 Answer

Thomas Oliver Bastable
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.a{fill-rule:evenodd;}techdegree seal-36
Thomas Oliver Bastable
Python Development Techdegree Graduate 29,026 Points
Thomas Oliver Bastable
.a{fill-rule:evenodd;}techdegree seal-36
Thomas Oliver Bastable
Python Development Techdegree Graduate 29,026 Points

There's a slight mismatch between the values in the dictionary and the values the switch cases are looking for. (BGR / BRG).

The below code should fix this:

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