Functions

Question 1

What is a function?

Answer 1

A sequence of instructions that performs a specific task.

Question 2

Write a function to get the area of a room with a given length and width.

Answer 2

func area(width: Int, length: Int) -> Int {
    return width * length
}

Question 3

When you write a function such as func area(width: Int, length: Int), what is the name of the stuff inside the parentheses?

Answer 3

Parameters

Question 4

Is there a limit to the number of parameters?

Answer 4

No

Question 5

When you provide a value for parameters such as area(width: 10, length: 12), what are the values called?

Answer 5

Arguments

Question 6

If you have a function such as func area(width: Int, length: Int) -> Int, what is the value after the arrow called?

Answer 6

Return type

Question 7

What’s the return type of a function that doesn’t explicitly declare a return type?

Answer 7

Void

Question 8

TF: A function contains a random assortment of code that executes a variety of tasks

Answer 8

False. One specific task.

Question 9

What keyword do we use to output a value from a function

Answer 9

RETURN

Question 10

What keyword do we use to create a function?

Answer 10

Func

Question 11

What is wrong with the function declaration below?
func someFunction(Int, Int) -> Int {
    		return 1
	}

Answer 11

Function parameters require names

Question 12

Why will this code not compile?
func someFunction(a: Int) -> Bool {
    	return a
	}

Answer 12

The value we are returning does not match the return type.

Question 13

For the following function, what are havingValue and value? 
func remove(havingValue value: String) {
print(value)
}

Answer 13

havingValue is external name, value is local name

Question 14

Will external name or local name appear when you call the remove function?

Answer 14

External name which is havingValue

remove(havingValue: “A”)

Question 15

If we set up the function as below, what happens? 
func carpetCost(havingArea area: Int, carpetColor color: String = "Tan") -> Int

Answer 15

When you try to call the carpetCost function, you get 2 options, one with the default, and one where you can change the color

Question 16

If we want to set up a function but don’t want parameters, how can we avoid them?

Answer 16

Use _ 
func coordinates(_ location: String)