Return Are Reference Types
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func makeIncrementer(forIncrement amount: Int) -> () -> Int {
var runningTotal = 0
func incrementer() -> Int {
runningTotal += amount
return runningTotal
}
return incrementer
}
let incrementByTen = makeIncrementer(forIncrement: 10)
incrementByTen()
// returns a value of 10
incrementByTen()
// returns a value of 20
incrementByTen()
// returns a value of 30
let incrementBySeven = makeIncrementer(forIncrement: 7)
incrementBySeven()
// returns a value
incrementByTen()
// returns a value of 40
incrementBySeven()
// returns a value of 14
let alsoIncrementByTen = incrementByTen
alsoIncrementByTen()
// returns a value of 50
incrementByTen()
// returns a value of 60
Swift
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