(itemName, itemLocation, icon, action)

(data)

(target, firstClass, secondClass)

(obj1, obj2)

()

()

(array)

(location)

()

({ clickedTopic })

()

({ isNightlyTheme, toggleTheme, onSavedItemsChange, onNavbarClick, onListButtonClick, savedItems }

({ isNightlyTheme, toggleTheme, showText })

()

()

(prevProps)

(props)

(props)

(props)

(props)

()

(props, state)

()

()

(state = initialState.subjects, action)