Function Multiple arguments in Groovy

In Groovy, you can use multiple arguments in a method or function by defining them within the parentheses after the method name. Here is an example:

def calculateSum(int a, int b) {
    return a+b
}
println(calculateSum(2,3))

In this example, we have defined a function called calculateSum that takes two arguments a and b. The function simply adds the two arguments together and returns the result. We then call the function with the values 2 and 3 as the arguments, and the result 5 is printed to the console.

You can also define functions with optional arguments in Groovy using the ? operator. Here is another example:

def greet(String name, String? message = null) {
    if (message) {
        println("$message, $name!")
    } else {
        println("Hello, $name!")
    }
}
greet("John")

greet("Jane", "Good morning")

In this example, we have defined a function called greet that takes two arguments: name and an optional argument message. If the message argument is provided, the function prints out the message followed by the name. Otherwise, it simply greets the person by name.

We call the function twice, first with just the name argument, and then with both name and message. The output of the first call is "Hello, John!", while the output of the second call is "Good morning, Jane!".