- Returning multiple elements from components with fragments - 16
- Error boundaries - 16
- Returning strings and numbers from components - 16
- Cancelling setState() to avoid re-rendering - 16
- Avoiding prop drilling with the official context API - 16.3
- Updating state based on props with getDerivedStateFromProps() - 16.3
- Re-rendering function components on props change with React.memo(), React.lazy() - 16.6
- Easier access to context in class components with contextType - 16.6
- React hooks useContext, useEffect, useState - 16.8
- Additional hooks useReducer, useCallback, useMemo, useRef - 16.8
