Consider a scenario where you have a deep nested component structure, and you need to break out of the current styling context (like an overflow hidden container). Which React feature would you use?

  • Context API
  • Portals
  • Redux
  • useMemo hook
To break out of the current styling context, you can use React Portals. Portals allow you to render a component at a different place in the React tree, often outside of the DOM hierarchy of the parent component, which is useful for situations like modals or tooltips. Context API and Redux are state management solutions, not specifically designed for this purpose. The useMemo hook is used for memoization, optimizing the rendering performance of components.

Which library is popularly used in the React ecosystem to provide immutable data structures?

  • Immutable.js
  • Mutable.js
  • React Immutable Structures
  • Unchangeable.js
Immutable.js is a popular library in the React ecosystem used to provide immutable data structures. It offers a set of data structures that can be used in place of JavaScript's native data structures, making it easier to work with immutable data in React applications. The library is well-suited for managing state in React components and is widely adopted in the React community.

Which React feature can be combined with the Context API to optimize performance in components that consume context values?

  • React Fragments
  • React Hooks
  • React Portals
  • React Suspense
To optimize performance in components that consume context values, you can combine the Context API with React Hooks. Specifically, you can use the useContext hook to access context values. This hook allows you to consume context values without the need for a higher-order component, improving code readability and maintainability. React Portals, React Fragments, and React Suspense are not typically used for optimizing context consumption performance.

Which React feature works in tandem with React.lazy to display fallback UI while a component is being lazily loaded?

  • React.Suspense
  • React.Fallback
  • React.LazyUI
  • React.Loading
React.Suspense is the React feature that works with React.lazy to display a fallback UI while a component is being lazily loaded. This helps improve the user experience by showing a loading indicator or a fallback UI while the required component is fetched and rendered lazily. Other options like React.Fallback, React.LazyUI, and React.Loading are not standard React features.

When considering Server-Side Rendering (SSR) in React, which framework is widely recognized for this purpose?

  • Angular Universal
  • Gatsby.js
  • Next.js
  • Vue Server Renderer
Next.js is widely recognized for Server-Side Rendering (SSR) in React applications. It provides an out-of-the-box solution for SSR, making it easier to implement server-side rendering in React applications. While other frameworks like Angular Universal and Gatsby.js also support SSR, Next.js is particularly popular in the React ecosystem for this purpose.

What is the main advantage of using computed properties in MobX?

  • Computed properties simplify the setup process of MobX stores.
  • Computed properties allow for asynchronous state updates.
  • Computed properties provide a performance optimization by caching results.
  • Computed properties are used for data persistence.
The main advantage of using computed properties in MobX is that they provide a performance optimization by caching results. Computed properties automatically recompute only when their dependencies change, improving the efficiency of your application. The other options do not accurately describe the primary advantage of computed properties in MobX.

In which lifecycle method should you make API calls in a class component?

  • componentDidMount
  • componentWillUnmount
  • render
  • constructor
You should make API calls in the componentDidMount lifecycle method of a class component. This method is called once after the component has been mounted in the DOM, making it suitable for actions like fetching data from an API. The other options (componentWillUnmount, render, and constructor) are not the appropriate places for making API calls.

The React team recommends using keys that are ________ and not based on indices for list items to optimize the reconciliation process.

  • arbitrary
  • random
  • sequential
  • unique
To optimize the reconciliation process in React, it's recommended to use unique keys for list items. Using unique keys ensures that React can accurately track and update individual items in a list, even if items are added, removed, or rearranged. This is more effective than using sequential or arbitrary keys.

How can you type a higher order component (HOC) in TypeScript that modifies the props of the wrapped component?

  • Using TypeScript's utility type Omit.
  • By creating a new component with modified props and using TypeScript's Partial type.
  • TypeScript doesn't support typing HOCs.
  • By using TypeScript's withProps keyword.
In TypeScript, you can type a Higher Order Component (HOC) that modifies the props of the wrapped component by using TypeScript's utility type Omit. This allows you to exclude specific properties from the original props, effectively modifying them. The other options are not standard approaches to typing HOCs in TypeScript.

In React Native, how would you ensure that the app looks consistent across different devices and screen sizes?

  • By designing separate layouts for each screen size.
  • By setting a fixed layout for all devices.
  • By using media queries in CSS.
  • By using responsive components and styles.
In React Native, to ensure consistency across various devices and screen sizes, you should use responsive components and styles. This allows your app to adapt its layout and styling based on the device's screen dimensions. Unlike web development, where media queries are commonly used, React Native relies on flexbox and responsive styling within its components to achieve this consistency.