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void main() {
int count = 0;
void onUpdate(int value) => print('Counter: $value');
void increment(void Function(int) callback) {
count++;
callback(count);
}
void decrement(void Function(int) callback) {
count--;
callback(count);
}
void reset(void Function(int) callback) {
count = 0;
callback(count);
}
increment(onUpdate);
increment(onUpdate);
decrement(onUpdate);
reset(onUpdate);
}Coding works best on desktop or with an external keyboard.