React.js, often simply called React, is a highly popular JavaScript library for building user interfaces. Developed and maintained by Facebook, React is renowned for its component-based architecture and the ability to efficiently update and render components when data changes. It is a foundational tool for developing modern web and mobile applications, allowing developers to create dynamic and interactive user interfaces with ease. React's vast ecosystem, including tools like React Native for mobile app development, makes it a top choice for frontend development and a key player in the world of web technologies.
101. In React, what is conditional rendering?
Answer:Rendering components conditionally
102. How can you conditionally render content in a React component using JSX?
Answer:By using the if statement
103. What is the purpose of the ternary conditional operator (? :) in conditional rendering?
Answer:To conditionally render content
104. Which React element type is commonly used to render conditional content based on a condition?
Answer:<div>
105. In React, how do you conditionally render content based on a state or prop value?
Answer:By using JSX conditional expressions
106. What is the purpose of the logical AND (&&) operator in conditional rendering in React?
Answer:To conditionally render content
107. How do you render one component if a condition is true and another component if it's false in React?
Answer:By using JSX conditional expressions
108. In React, what is the purpose of the else block when using conditional rendering?
Answer:To conditionally render content
109. When using conditional rendering in React, which method is commonly used to handle event listeners?
Answer:componentDidMount
110. What happens if you omit the else block in a conditional rendering statement in React?
