For fetching data before rendering a component in a route, you might use the React Router's ________ method.
- fetchComponent
- fetchRoute
- preload
- useEffect
To fetch data before rendering a component in a route with React Router, you can use the preload method. This method allows you to load data asynchronously and ensure it's available before rendering the component associated with the route. Using preload helps improve user experience by reducing unnecessary delays.
React Router provides a hook called ________ that lets you access the state of the current route.
- getCurrentRoute
- getRouteState
- useLocation
- useRouteState
React Router provides a hook called useLocation that allows you to access the state of the current route. This is commonly used to extract parameters or query strings from the URL to determine the current route's state or perform conditional rendering based on the route.
Immutability in state handling can help in avoiding unintended ________ that can arise from direct mutations.
- Bugs
- Optimization issues
- Security breaches
- Side effects
Immutability in state handling primarily helps avoid unintended side effects that can result from direct mutations. When states are immutable, it's easier to reason about the behavior of the program and prevents unintended consequences. It's not primarily about avoiding bugs, optimization issues, or security breaches, although these can be related to proper state management.
What is a Progressive Web App (PWA)?
- A native mobile application.
- A type of server architecture.
- A web application with advanced features.
- A website that cannot be accessed offline.
A Progressive Web App (PWA) is a web application with advanced features that provide a native app-like experience to users. PWAs are designed to be fast, reliable, and work offline. They can be installed on a user's device and have features like push notifications. They are not native mobile apps but offer similar capabilities, making them an excellent choice for web development.
What is the advantage of using immutable data structures in a React application?
- Improved performance due to mutable data.
- Simplicity in managing and tracking data changes.
- Enhanced support for two-way data binding.
- Better compatibility with third-party libraries.
Using immutable data structures in a React application simplifies managing and tracking data changes. When data is immutable, changes create new data objects rather than modifying existing ones, making it easier to understand how and when data changes occur. This leads to more predictable and manageable React applications. The other options do not accurately describe the advantages of immutability in React.
For type-safe operations in React components, props, and state, developers can utilize ________ to add static typing.
- ES6
- Flow
- JavaScript
- TypeScript
Developers can use "TypeScript" to add static typing to React components, props, and state. TypeScript is a statically typed superset of JavaScript, which helps catch type-related errors at compile time, making React code more robust and maintainable.
When fetching data from an API, the ________ pattern in React helps handle loading, error, and success states efficiently.
- Container-Component Pattern
- Higher-Order Component Pattern
- Render Props Pattern
- State Pattern
When fetching data from an API, the Render Props pattern in React helps handle loading, error, and success states efficiently. This pattern involves rendering a component with a function as a child, allowing it to pass data and behavior to the children components. This is commonly used to manage the state and UI for API requests. The other options (Container-Component, Higher-Order Component, and State patterns) are related to React but do not specifically address API data fetching and state handling.
When a change is made to an immutable data structure, it creates a new version without altering the original. This principle is known as ________.
- Alterability
- Changeability
- Immutability
- Mutation
When a change is made to an immutable data structure, it creates a new version without altering the original data. This principle is known as "Immutability." Immutable data structures are essential in functional programming to ensure predictable and safe data manipulation.
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.
The process that allows React to efficiently update the DOM by comparing the current and next versions of the virtual DOM is called ________.
- Component Reusability
- Event Handling
- Reconciliation
- Redux
The process in React that efficiently updates the DOM by comparing the current and next versions of the virtual DOM is called "Reconciliation." During this process, React determines the differences (or changes) between the old and new virtual DOM trees and then updates only the parts that have changed in the actual DOM, resulting in improved performance.