In React, event handlers set on components are actually set on the ________ and not on the individual elements.
- component instances
- document root
- individual elements
- parent container
In React, event handlers set on components are actually set on the component instances themselves and not on the individual DOM elements. This allows React to efficiently manage and delegate events within its virtual DOM, making it a key aspect of React's event handling mechanism.
You are building a form in a functional component and need to keep track of form input values. Which hook would be most appropriate to manage the form state?
- useContext
- useEffect
- useMemo
- useState
To manage form input values in a functional component, the most appropriate hook is useState. useState allows you to create and update state variables, which can be used to track form input values as users interact with the form elements. While useEffect, useMemo, and useContext have their use cases, they are not designed for managing form state directly.
For animating route transitions in a React application, you can use the ________ alongside React Router.
- "Axios"
- "Babel"
- "React Transition Group"
- "Redux"
To animate route transitions in a React application, you can use the "React Transition Group" library alongside React Router. This library provides components and hooks for adding animation effects during route changes, enhancing the user experience.
What is the primary purpose of a Higher Order Component (HOC) in React?
- To control the styling of a component.
- To create reusable logic for multiple components.
- To define the visual structure of a component.
- To manage the state of a component.
The primary purpose of a Higher Order Component (HOC) in React is to create reusable logic that can be applied to multiple components. HOCs are used to abstract and share common functionality or behavior, making it easier to maintain and reuse code across different parts of an application.
How does React's virtual DOM improve performance over direct DOM manipulation?
- It minimizes direct manipulation of the DOM.
- It eliminates the need for JavaScript.
- It reduces the size of the browser cache.
- It disables component re-rendering.
React's virtual DOM improves performance by minimizing direct manipulation of the DOM. Instead of making frequent changes to the actual DOM, React works with a virtual representation of the DOM and calculates the most efficient way to update it. This reduces browser reflows and repaints, leading to better performance. The other options are not accurate descriptions of virtual DOM's benefits.
When building a protected route in React Router, what is a common strategy to determine if a user should be redirected to a login page?
- Checking if the user's session token is valid.
- Using a regular expression to match the route path.
- Checking the browser's localStorage for a login flag.
- Sending a GET request to the server to validate the user's credentials.
A common strategy for determining if a user should be redirected to a login page when building a protected route in React Router is to check if the user's session token is valid. Session tokens often store authentication information and can be validated on the server to ensure the user is authenticated. The other options may be used for different purposes but are not typically used for this specific scenario.
For assets that change frequently, the ________ caching strategy is often more appropriate than cache-first.
- Cache-first
- Cache-only
- Network-first
- Stale-while-revalidate
For assets that change frequently, the network-first caching strategy is often more appropriate than cache-first. Network-first prioritizes fetching the latest version of a resource from the network and uses the cache as a fallback. This is suitable for frequently updated assets like API responses.
How does Next.js handle client-side navigation between pages?
- By making direct HTTP requests for each page.
- By pre-rendering all pages during build time.
- Through client-side JavaScript routing.
- Using a traditional server-side rendering approach.
Next.js handles client-side navigation between pages through client-side JavaScript routing. It doesn't require traditional server-side rendering or making direct HTTP requests for each page. Instead, it utilizes client-side routing to load and display pages efficiently. This is a key feature of Next.js that improves the user experience.
What is the primary benefit of lazy loading components in React?
- Enhanced SEO.
- Improved component reusability.
- Reduced initial load time.
- Simplified state management.
The primary benefit of lazy loading components in React is to reduce the initial load time of your application. By loading components only when they are needed, you can minimize the amount of code and assets loaded upfront, which leads to faster page rendering and improved user experience. While other benefits like improved component reusability are valuable, reducing initial load time is the primary advantage of lazy loading.
When dealing with arrays in an immutable way, rather than using push or pop methods, developers should opt for ________ or ________ methods.
- Add and Remove
- Create and Delete
- Increment and Decrement
- Shift and Unshift
When working with arrays in an immutable way, developers should opt for Shift and Unshift methods rather than using push or pop methods. Shift removes an element from the beginning of an array, and Unshift adds an element to the beginning, ensuring immutability as opposed to push and pop, which modify the end of the array.