Functions

Which keyword is used to define a function in Swift?

• func

• function

• def

• method

func sum(_ numbers: Int...) -> Int {

var total = 0

for n in numbers {

total += n

}

return total

}

print(sum(1, 2, 3, 4))

• 10

• 1234

• Error

• nil

func outer() {

func inner() {

print("Inner function")

}

inner()

}

outer()

• Inner function

• outer

• Error

• nil

func divide(_ a: Double, _ b: Double) -> Double? {

if b == 0 {

return nil

}

return a / b

}

print(divide(10, 2)!)

• 5.0

• nil

• Error

• Infinity

func factorial(_ n: Int) -> Int {

if n <= 1 { return 1 }

return n * factorial(n - 1)

}

print(factorial(4))

• 24

• 16

• 4

• Error