create a function in swift

In Swift, a function can be declared using the func keyword followed by the name of the function, a set of parentheses that may include parameters, and an optional return type.

Here is an example of a function that takes two parameters of type Int and returns their sum:

main.swift
func addNumbers(_ a: Int, _ b: Int) -> Int {
    return a + b
}
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In this example, the function is named addNumbers, takes two parameters of type Int, and returns an Int.

The -> symbol is used to specify the return type of the function. In this case, the function returns an Int.

To call the function, you can simply use its name and pass in the required arguments:

main.swift
let result = addNumbers(5, 7)
print("The result is \(result)") // "The result is 12"
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In this example, the addNumbers function is called with arguments 5 and 7, which returns the value 12. This value is then assigned to the constant result and printed to the console.