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<h2>Dart mode</h2>
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import 'dart:math' show Random;
void main() {
print(new Die(n: 12).roll());
}
// Define a class.
class Die {
// Define a class variable.
static Random shaker = new Random();
// Define instance variables.
int sides, value;
// Define a method using shorthand syntax.
String toString() => '$value';
// Define a constructor.
Die({int n: 6}) {
if (4 <= n && n <= 20) {
sides = n;
} else {
// Support for errors and exceptions.
throw new ArgumentError(/* */);
}
}
// Define an instance method.
int roll() {
return value = shaker.nextInt(sides) + 1;
}
}
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