Dotnet with React Final Quiz

**In React, what is the correct way to update state that depends on the previous state?**

• A) `this.state.count = this.state.count + 1`
• B) `setState({count: this.state.count + 1})`
• C) `setState(prevState => ({count: prevState.count + 1}))`
• D) `this.state = {...this.state, count: this.state.count + 1}`

**What is the purpose of the `key` prop when rendering lists in React?**

• A) It's required for styling list elements
• B) It helps React identify which items have changed, are added, or removed
• C) It's used to access list elements from parent components
• D) It determines the order of elements in the DOM

**Which React Hook would you use to perform side effects after every render?**

• A) `useEffect(() => {}, [])`
• B) `useEffect(() => {})`
• C) `useLayoutEffect(() => {})`
• D) `useCallback(() => {})`

**What is a higher-order component (HOC) in React?**

• A) A component that renders another component
• B) A function that takes a component and returns a new component with enhanced functionality
• C) A component with nested components inside
• D) A component with more than 100 lines of code

how do you prevent a component from re-rendering unnecessarily?

• A) Use `shouldComponentUpdate` lifecycle method or `React.memo`
• B) Return `false` from the `render` method
• C) Use `componentWillUpdate` to cancel updates
• D) Set `this.renderingDisabled = true`

**What's the purpose of React's Context API?**

• A) To style components globally
• B) To share state across components without prop drilling
• C) To optimize performance of deep component trees
• D) To create global event listeners

When using the `useReducer` Hook, what are the two values returned from the Hook?

• A) `[reducer, dispatch]`
• B) `[state, setState]`
• C) `[state, dispatch]`
• D) `[action, reducer]`

What is the correct way to conditionally render a component in React

• A) `if (condition) { return <Component /> } else { return null }`
• B) `condition && <Component />`
• C) `<Component visible={condition} />`
• D) Both A and B are correct

What is the correct way to pass a method to a child component that needs to update the parent's state?

• A) Make the child component extend the parent class
• B) Pass the method as a prop to the child component
• C) Use global state management like Redux
• D) Use the Context API

What is the purpose of the IDisposable interface in .NET?

• To handle exceptions
• To properly release unmanaged resources
• To create serializable objects
• To implement dependency injection