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Q & A
What is the primary purpose of functions in Swift?
-The primary purpose of functions in Swift is to group together a set of code statements that perform a specific task. Once a function is created, it can be called to execute that task whenever needed, promoting code reusability and organization.
How do you declare a function in Swift?
-To declare a function in Swift, you use the `func` keyword followed by the function name, then parentheses `()`. After that, you enclose the function’s code inside curly brackets `{}`. For example: `func sayHello() { print('Hello!') }`.
What does the `func` keyword do in Swift?
-The `func` keyword is used to declare a function in Swift. It indicates that the following code is a function definition.
How do you call or invoke a function in Swift?
-To call a function in Swift, you simply use its name followed by parentheses `()`. For example, to call a function `sayHello`, you write `sayHello()`. The function's code will execute when it’s called.
What are parameters in Swift functions?
-Parameters are values that you pass into a function when calling it. They are declared inside the parentheses `()` of the function declaration. For example, in `func greet(name: String)`, `name` is a parameter of type `String`.
How do you pass arguments to a function in Swift?
-You pass arguments to a function by providing values inside the parentheses when calling the function. These values correspond to the parameters declared in the function definition. For example, `greet(name: 'Alice')` passes 'Alice' as the argument to the `name` parameter.
What is the role of the `return` keyword in Swift functions?
-The `return` keyword is used in functions that output a value. When you declare a function to return a value, you must use `return` to specify what value the function should provide after execution.
What happens when a function is declared with a return type in Swift?
-When a function is declared with a return type, it must return a value of that specified type using the `return` keyword. For example, `func add(a: Int, b: Int) -> Int { return a + b }` returns an integer.
What is a parameter label in Swift, and why is it used?
-A parameter label in Swift is a descriptive name used in function calls to clarify the purpose of the argument being passed. It helps make the function call more readable. For example, `func add(firstNum a: Int, secondNum b: Int)` allows you to call the function as `add(firstNum: 3, secondNum: 5)`.
What is a function signature in Swift?
-A function signature in Swift uniquely identifies a function. It includes the function's name, the names and types of its parameters, and the return type. The signature allows the system to distinguish between different functions, even if they share the same name.