How do I know if optional parameter exists in darts?

It turns out that Dart does indeed have a way to ask if an optional parameter was provided when the method was called. Just use the question mark parameter syntax .

Unlike positional parameters, the parameters’ name must be specified while the value is being passed . Curly brace {} can be used to specify optional named parameters.

By definition, an Optional Parameter is a handy feature that enables programmers to pass less number of parameters to a function and assign a default value .

By definition, an Optional Parameter is a handy feature that enables programmers to pass less number of parameters to a function and assign a default value .

To specify the optional argument with default values, we use {} curly braces . In optional positional argument and optional named argument, if we don’t specify the value in an argument then it is set to NULL.

To specify the optional argument with default values, we use {} curly braces . In optional positional argument and optional named argument, if we don’t specify the value in an argument then it is set to NULL.

Unlike positional parameters, the parameters’ name must be specified while the value is being passed . Curly brace {} can be used to specify optional named parameters.