How to use

ObservableMap

in

mobservable

render() {
    return (
      <App header = {CheckboxesStore.header}
        items = {CheckboxesStore.items}
        changeItems = {(label, checked) => transaction(() => CheckboxesStore.items.forEach((itemChecked, itemLabel) => CheckboxesStore.items.get(itemLabel).checked = checked))}
        changeItem = {(label, checked) => CheckboxesStore.items.get(label).checked = checked}
      />
    );
  }

createItem(label, checked = false) {
    this.items.set(label, new Item(label, checked));
  }