Function declaration syntax in Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the basic syntax to declare a function in Swift?

Use the func keyword, followed by the function name, parentheses for parameters, and curly braces for the function body.<br><br>Example:<br>func greet() {<br> print("Hello")<br>}

beginner

How do you declare a function in Swift that takes parameters?

Inside the parentheses, list parameters with their names and types separated by colons.<br><br>Example:<br>func greet(name: String) {<br> print("Hello, \(name)!")<br>}

beginner

How do you specify a return type in a Swift function declaration?

Add an arrow -> followed by the return type after the parameter list.<br><br>Example:<br>func add(a: Int, b: Int) -> Int {<br> return a + b<br>}

beginner

What keyword do you use to return a value from a Swift function?

Use the return keyword followed by the value you want to send back.<br><br>Example:<br>func square(number: Int) -> Int {<br> return number * number<br>}

beginner

Can Swift functions have no parameters and no return value? How?

Yes, simply declare the function with empty parentheses and no return type.<br><br>Example:<br>func sayHello() {<br> print("Hello!")<br>}

Which keyword starts a function declaration in Swift?

A def

B function

C func

D fun

Swift uses func to declare functions.

How do you declare a function that returns an integer in Swift?

A func example() -> Int {}

B func example(): Int {}

C func example() returns Int {}

D func example() Int {}

The return type is specified with -> Type after the parameter list.

What symbol separates parameter names and their types in Swift function declarations?

A ,

B =

C ->

D :

Parameters are declared as name: Type.

Which keyword is used to send a value back from a Swift function?

A return

B yield

C send

D output

Use return to output a value from a function.

Can a Swift function have no parameters and no return type?

A Yes, but only if marked with special keyword

B Yes, by using empty parentheses and no return arrow

C No, functions must return a value

D No, functions must have parameters

Functions can have empty parentheses and no return type.

Explain how to declare a function in Swift that takes two integers and returns their sum.

Think about the function name, parameters, return type, and how to return the result.

Describe the parts of a Swift function declaration and their purpose.

Consider what each part does in the function.