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dart optional positional parameters
// Dart Optional Positional Parameters
void myFunction(String name1, String name2, [String name3]) {
// ...name3 is optional, and after required parameters
}
// Dart Optional Named Parameters
void myFunction(int x, {int y = 2}) {
// ...y is optional, default is 2
}
myFunction(2, y: 4); // sequence does not matter
Source: flutterrdart.com
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