Programming in Swift: Functions & Types

Jan 4 2022 · Swift 5.5, iOS 15, Xcode 13

Part 3: Enumerations

26. Associated Values

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Previous episode: 25. Challenge: Switch Statements Next episode: 27. Conclusion

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Notes: 26. Associated Values

Update Notes: This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.

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Now that you’ve got a handle on switch statements, there’s one more important thing to cover about enumerations.

enum TwoDimensionalPoint {

}

case origin

case onXAxis(Double)
case onYAxis(Double)

case noZeroCoordinate(x: Double, y: Double)

let coordinates = (1.0, 3.0)
let twoDimensionalPoint: TwoDimensionalPoint

switch coordinates {
default: 
  twoDimensionalPoint = .noZeroCoordinate(x: coordinates.0, y: coordinates.1)
}

case (0, 0): 
  twoDimensionalPoint = .origin

let coordinates = (0.0, 0.0)

case (_, 0):
  twoDimensionalPoint = .onXAxis(coordinates.0)
case (0, _):
  twoDimensionalPoint = .onYAxis(coordinates.1)

let coordinates = (0.0, 7.0)

func getValues(for point: TwoDimensionalPoint) -> (x: Double, y: Double) {

}

switch point {

}

case .origin:
  return (0, 0)

case let .onXAxis(x):
  return (x, 0)

case .onYAxis(let y):
  return (0, y)

case let .noZeroCoordinate(x, y):
  return (x, y)

getValues(for: .origin)
getValues(for: .onXAxis(66.6))
getValues(for: .onYAxis(-3.5))
getValues(for: TwoDimensionalPoint.noZeroCoordinate(x: 5, y: 7))