Flutter in Action

To call a void function from another file in Flutter, what you have to do are:

The main() function is a predefined method in Dart . This method acts as the entry point to the application. A Dart script needs the main() method for execution. print() is a predefined function that prints the specified string or value to the standard output i.e. the terminal.

In order to write any Dart program, be it a script or a Flutter app, you must define a function called main . void main() { print(‘Hello, Dart’); } This function tells Dart where the program starts , and it must be in the file that is considered the “entry point” for you program.

In a large variety of languages void as return type is used to indicate that a function doesn’t return anything . Dart allows returning null in functions with void return type but it also allow using return; without specifying any value. To have a consistent way you should not return null and only use an empty return.