In Next.js, to provide a custom document structure, you would override the default ________ component.
- "Custom"
- "Document"
- "Layout"
- "Template"
In Next.js, to provide a custom document structure, you would override the default "Document" component. This allows you to control the HTML and head elements of the page, making it useful for customizing the overall structure and layout of your Next.js application.
In MobX, the ________ function can be used to observe changes in observables and react to those changes.
- autorun
- observe
- reaction
- transaction
In MobX, the autorun function can be used to observe changes in observables and react to those changes. When you use autorun, it will automatically track which observables are being accessed inside the provided function and trigger a re-run whenever those observables change. This is a fundamental mechanism for reacting to changes in MobX.
What is the main advantage of using something like Redux over local state?
- Centralized state management.
- Simplicity and minimal setup.
- Automatic garbage collection.
- Enhanced UI performance.
The primary advantage of using something like Redux over local state is centralized state management. Redux allows you to store application state in a single location, making it easier to manage and access across different components. While the other options may be advantages of Redux or local state in certain contexts, centralization is the core benefit.
You've been tasked with adding real-time map updates in a logistics application using React. Which combination of technologies would be most effective?
- WebSocket for real-time updates and Leaflet for maps
- REST APIs for real-time updates and Google Maps API
- GraphQL for real-time updates and Mapbox
- AJAX for real-time updates and OpenLayers
For real-time map updates in a React application, WebSocket for real-time updates and Leaflet for maps would be the most effective combination. WebSocket allows bidirectional, low-latency communication, ideal for real-time updates. Leaflet is a popular mapping library. The other options do not offer the same real-time capabilities or suitable map libraries.
React ________ allow you to return multiple elements from a component without adding a DOM element.
- Components
- Fragments
- Hooks
- Keys
React Fragments allow you to return multiple elements from a component without adding a DOM element like a div. They are a lightweight way to group multiple elements without introducing unnecessary nodes in the DOM. While keys, components, and hooks are all important concepts in React, they are not directly related to this specific behavior.
In the Render Props pattern, the component that shares its state or functionality is typically invoked as a ________.
- Child Component
- Wrapper Component
- Parent Component
- Functional Component
In the Render Props pattern, the component that shares its state or functionality is typically invoked as a Wrapper Component. The Wrapper Component defines a render prop, allowing the child component to access and utilize the shared state or functionality. This pattern is used to share behavior or data between components in a flexible way. The other options do not accurately describe the role of the component that shares its state in the Render Props pattern.
In class components, the method used to update the state is ________.
- this.updateState
- setState()
- changeState()
- modifyState()
In class components in React, the method used to update the state is setState(). This method is used to update the state object, and React then re-renders the component to reflect the new state. The other options are not valid methods for updating state in class components.
When using libraries like Immer, what is the term used for the function you provide that describes the state changes?
- modifyState
- mutator
- reducer
- transform
When using libraries like Immer, you typically provide a function known as a "reducer" that describes the state changes. This function takes the current state and a draft state, and you specify the changes to be made. The reducer function is a fundamental concept in libraries like Immer and Redux for managing state updates in an immutable fashion.
A component that is used to transform another component by adding additional logic or properties is called a ________.
- HOC (Higher Order Component)
- Container Component
- Stateless Component
- Functional Component
A Higher Order Component (HOC) is used to wrap or enhance other components by adding additional logic or properties. HOCs are a common pattern in React for code reuse and logic sharing. While the other options are types of components used in React, they do not specifically describe the component that adds logic or properties to another.
Why is immutability important in React state management?
- To make the code shorter and easier to read.
- To allow state changes without restrictions.
- To introduce complexity into code.
- To ensure predictable and bug-free state management.
Immutability is crucial in React state management to ensure predictability and bug-free behavior. When state is immutable, it cannot be changed directly, which prevents unexpected side effects and simplifies debugging. The other options are not accurate; immutability adds a level of simplicity and predictability to the code.