Swift Programming Functions

In this Swift programming language tutorial, we will go over functions.

[RyanNoonan]

You may see functions with 2 parameter labels. The code examples below give some details on how these labels are used.

// first parameter(s) (number1, number2) are used when calling function
// second parameter(s) (num1, num2) are used within the function
func addTwo(number1 num1: Double, number2 num2: Double) -> Double {
return num1 + num2
}
print(addTwo(number1: 15, number2: 15))

// if first parameter(s) are blank (dashes) no argument labels are needed to call the function
func multTwo(_ num1: Double, _ num2: Double) -> Double {
return num1 * num2
}
print(multTwo(5, 5))