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

Ace Suryadi
Ace Suryadi
11,594 Points
Posted by Ace Suryadi
Ace Suryadi
11,594 Points

Why is it nor working again?

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,value) { case ("BEL": "Brussels"): europeanCapitals.append(value) case ("LIE": "Vaduz"): europeanCapitals.append(value) case ("BGR": "Sofia"): europeanCapitals.append(value) case ("IND": "New Delhi"): asianCapitals.append(value) case ("VNM": "Hanoi"): asianCapitals.append(value) default: otherCapitals.append(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 {
    switch (key,value) {
    case ("BEL": "Brussels"): europeanCapitals.append(value)
    case ("LIE": "Vaduz"): europeanCapitals.append(value)
    case ("BGR": "Sofia"): europeanCapitals.append(value)
    case ("IND": "New Delhi"): asianCapitals.append(value)
    case ("VNM": "Hanoi"): asianCapitals.append(value)
    default: otherCapitals.append(value)
    }
}

2 Answers

Paul Brazell
Paul Brazell
14,371 Points
Paul Brazell
Paul Brazell
14,371 Points

You just need to switch on the key, not a (key, value) pair.

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