The terms parameters and arguments can be used for the same thing information that passed into a function. The parameters are the variables listed inside the parentheses in the function definition.
The parameters are not compulsory in dart. They can be used when needed.
The optional parameter should be set as the last argument in a function. We have three different types of optional parameters in Dart -
Optional Positional Parameter :- To specify optional parameters, use square [ ] brackets.
Optional named parameter :- Unlike positional parameters, the parameter’s name must be specified while the valuse is begin passed. curly brace { } can be used to specify optional named parameters.
Optional Paramaters with Default Values :- Functions parameters can also be assigned values with default. However, such parameters can be explicitly passed values.