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state_example: notes viewlogic
// We create a "logic ref", which will store a reference to NotesViewLogic.
final notesViewLogicRef = LogicRef((scope) => NotesViewLogic(scope));
class NotesViewLogic with Logic {
const NotesViewLogic(this.scope);
final Scope scope;
void addNote() {
var state = read(notesRef);
state.copyWith(notes: state.notes.concat(state.input), input: ''));
void updateInput(String input) =>
write(notesRef, read(notesRef).copyWith(input: input));
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