In Kotlin, you can use default values for function or method arguments as a way to provide a default value when the caller doesn't provide a value for that argument. This can be useful to simplify function calls and reduce the amount of boilerplate code required to call a function.
Here's an example:
fun greet(name: String = "friend") {
println("Hello, $name!")
}
// calling with a provided argument
greet("John") // prints "Hello, John!"
// calling without a provided argument
greet() // prints "Hello, friend!"
In this example, the function greet() takes a single argument name with a default value of "friend". When called with an argument, the provided value is used. When called without an argument, the default value of "friend" is used instead.
You can also use named arguments to override default values, like this:
// calling with a named argument
greet(name = "Jane") // prints "Hello, Jane!"
Here, the named argument name is used to specify a value of "Jane", overriding the default value of "friend". This allows you to provide values for specific arguments without having to specify values for all arguments.