Senior React Native Developer Resume Sample

React is continuously evolving and a few notable features and changes in React included the introduction of Concurrent Mode for improved performance, React Hooks for state management in functional components, and the Suspense API for handling asynchronous data fetching.

The Context API is a feature in React that allows you to manage and share state data across components without having to pass props down through multiple levels of the component tree. It provides a way to create a global store of data that can be accessed by any component in your application. To use the Context API, you typically create a context object using `React.createContext()` and provide it at a higher level in your component hierarchy. Components can then consume this context using the `useContext` hook.

React Portals are a feature that enables you to render components outside the normal parent-child hierarchy of the DOM. This is useful for scenarios like modals, tooltips, or popovers, where you want to render a component at a specific location in the DOM tree, even if it's not a direct child of the root element. Portals provide a way to render content into a different DOM node using the `ReactDOM.createPortal()` function.

Error boundaries are a mechanism in React that allows you to catch and handle errors that occur during rendering, in lifecycle methods, and in constructors of a component's descendants. They help prevent the entire application from crashing due to unhandled errors in a specific component. You can create an error boundary by defining a component that implements either `componentDidCatch` or the newer `getDerivedStateFromError` lifecycle method. When an error is thrown within the error boundary or its children, these methods are called, and you can use them to handle the error gracefully, log it, or display a user-friendly error message.

React 18 introduced automatic batching which groups multiple state updates into a single re-render for better performance. This is particularly useful in scenarios where multiple state updates occur in quick succession, such as in response to a single event.

Test individual components for correctness in isolation, using tools like Jest for the test runner and React Testing Library to render components and interact with them in a testing environment. Focus on testing component behavior, such as handling props, state changes, and user interactions (clicks, input changes).

When semantic HTML falls short, use ARIA roles, states, and properties to enhance accessibility, especially for complex UI components like modals and dropdowns that require more specific details about their behaviors and relationships.