How many optional parameters are there in Dart?

Named optional parameters You can call getHttpUrl with or without the third parameter. You must use the parameter name when calling the function. You can specify multiple named parameters for a function: getHttpUrl(String server, String path, {int port = 80, int numRetries = 3}) { // … }

Optional Named Argument

Dart has two types of optional parameters: named and positional.

Dart ProgrammingServer Side ProgrammingProgramming. Optional parameters are those parameters that don’t need to be specified when calling the function . Optional parameters allow us to pass default values to parameters that we define. There are two types of optional parameters, mainly −