Flutter: Can I pass arguments to a function defined in an onPress event on a button?

Question

I have a simple form with a button to calculate the form. I figure it\'s better to hit the button to start the action of calculating and pass the variables to the dumb function

Answer 1

Do you remember the very first line in flutter which is

void main() => runApp(MyApp());

Where => represents one line functions or methods which is key while calling functions with arguments.

Ex:

void display() {

}

we can call the above function by

IconButton(icon: Icon(Icons.add), onPressed: display)

here we can not include () with display

But, when there is one or more than one arguments to be passed then it goes like below

void addition(int value1, int value2) {
    value1 + value2
}

IconButton(icon: Icon(Icons.add), onPressed: ()=>addition(2, 4))