function isViewModeKey(key) { return this.key === key.value } const modes = [ { key: 'week', name: 'Widok tygodnia', shortcut: 'Tydzień', is: isViewModeKey }, { key: 'month', name: 'Widok miesiąca', shortcut: 'Miesiąc', is: isViewModeKey }, ] export default { all: modes, find: whereMode => modes.find(mode => mode.key === whereMode), }