Flutter for Beginners

Function parameters

A function can have two types of parameters: optional and required. Additionally, as with most modern programming languages, these parameters can be named on call to make the code more readable.

The parameter type doesn't need to be specified; in this case, the parameter assumes the dynamic type:

• Required parameters: This simple function definition with parameters is achieved by just defining them in the same way as most other languages. In the following function, both name and additionalMessage are required parameters, so the caller must pass them when calling it:

sayHello(String name, String additionalMessage) => "Hello $name. $additionalMessage";

• Optional positional parameters: Sometimes, not all parameters need ...