Home Blog Privacy Policy Contact Us

React Native Component Lifecycle Quiz

What is the component lifecycle in React Native?

The process of rendering components on the screen
The sequence of events that occur during a component's lifespan
The component lifecycle in React Native refers to the sequence of events that occur during a component's lifespan, including initialization, mounting, updating, and unmounting.
The hierarchy of components in the application
The process of managing state and props

How many lifecycle methods are there in React Native?

3
5
7
There are seven lifecycle methods in React Native: constructor, render, componentDidMount, componentDidUpdate, componentWillUnmount, shouldComponentUpdate, and getDerivedStateFromProps.
9

What is the purpose of the constructor method in React Native?

To initialize state and bind event handlers
The constructor method in React Native is used to initialize state and bind event handlers. It is called before the component is mounted and is often used to set up initial state and bind methods to the component instance.
To render JSX elements
To update the component's state
To handle component unmounting

When does the componentDidMount method in React Native get called?

Before the component is rendered
After the component is rendered
The componentDidMount method in React Native is called after the component is rendered to the screen for the first time. It is often used to perform tasks such as fetching data from an API or subscribing to external events.
During the component's unmounting phase
During the component's updating phase

What is the purpose of the componentDidUpdate method in React Native?

To initialize state and bind event handlers
To render JSX elements
To update the component's state
To perform actions after a component's props or state have changed
The componentDidUpdate method in React Native is called after the component's props or state have changed and the component has been re-rendered. It is often used to perform actions such as fetching updated data or updating the DOM in response to state changes.

What is the purpose of the componentWillUnmount method in React Native?

To initialize state and bind event handlers
To render JSX elements
To update the component's state
To perform cleanup before the component is removed from the DOM
The componentWillUnmount method in React Native is called just before the component is removed from the DOM and destroyed. It is often used to perform cleanup tasks such as unsubscribing from external events or clearing timers.

When does the shouldComponentUpdate method in React Native get called?

Before the component is rendered
After the component is rendered
During the component's unmounting phase
During the component's updating phase
The shouldComponentUpdate method in React Native is called before the component is re-rendered, during the updating phase. It allows you to control whether or not the component should re-render based on changes to its props or state.

What is the purpose of the getDerivedStateFromProps method in React Native?

To initialize state and bind event handlers
To render JSX elements
To update the component's state
To synchronize state with props when props change
The getDerivedStateFromProps method in React Native is called before every render, both on the initial mount and on subsequent updates. It allows you to synchronize state with props when props change, by returning an object to update the state.

What are lifecycle methods?

Methods that control the lifecycle of a component
Lifecycle methods in React Native are special methods that control the lifecycle of a component, from initialization to destruction. They allow you to hook into different points in the component's lifecycle and perform actions at those points.
Methods that render JSX elements
Methods that update the component's state
Methods that handle component unmounting

How do you define lifecycle methods in React Native?

By using class components
Lifecycle methods in React Native are defined in class components. They cannot be used in functional components, but functional components can utilize equivalent functionality with hooks like useEffect.
By using functional components
By using higher-order components
By using hooks

What happens when a component is unmounted in React Native?

The component is removed from the DOM
When a component is unmounted in React Native, it is removed from the DOM and its memory is freed up. This occurs when the component is no longer needed or when its parent component is re-rendered without it.
The component's state is reset
The component's props are updated
The component is re-rendered

What are the different phases of the component lifecycle in React Native?

Initialization, mounting, updating, unmounting
The component lifecycle in React Native consists of four phases: initialization, mounting, updating, and unmounting. Each phase corresponds to a different stage in the component's lifespan and allows you to perform specific actions at those points.
Rendering, updating, unmounting
Initialization, rendering, updating, unmounting
Mounting, updating, unmounting

What is the purpose of the componentWillMount method in React Native?

To initialize state and bind event handlers
To render JSX elements
To update the component's state
To perform setup tasks before the component is mounted
The componentWillMount method in React Native is called just before the component is mounted to the DOM. It is often used to perform setup tasks such as initializing state or subscribing to external events.

What is the purpose of the componentWillReceiveProps method in React Native?

To initialize state and bind event handlers
To render JSX elements
To update the component's state
To perform actions when the component receives new props
The componentWillReceiveProps method in React Native is called when the component receives new props from its parent component. It is often used to perform actions such as updating the component's state based on the new props.

What is the purpose of the componentDidCatch method in React Native?

To initialize state and bind event handlers
To render JSX elements
To handle errors that occur during rendering
The componentDidCatch method in React Native is called when an error occurs during rendering, in any of the children of the component. It is used to handle errors gracefully and prevent them from crashing the entire application.
To update the component's state

What is the purpose of the getSnapshotBeforeUpdate method in React Native?

To initialize state and bind event handlers
To render JSX elements
To get a snapshot of the DOM before a component update
The getSnapshotBeforeUpdate method in React Native is called right before the changes from the virtual DOM are to be reflected in the DOM. It allows you to capture some information from the DOM before it is potentially changed.
To update the component's state

What is the purpose of the componentDidUpdate method in React Native?

To initialize state and bind event handlers
To render JSX elements
To perform actions after a component's props or state have changed
The componentDidUpdate method in React Native is called after the component's props or state have changed and the component has been re-rendered. It is often used to perform actions such as fetching updated data or updating the DOM in response to state changes.
To update the component's state

What is the purpose of the componentDidUnmount method in React Native?

To initialize state and bind event handlers
To render JSX elements
To perform cleanup before the component is removed from the DOM
The componentDidUnmount method in React Native is called just before the component is removed from the DOM and destroyed. It is often used to perform cleanup tasks such as unsubscribing from external events or clearing timers.
To update the component's state

What is the purpose of the getDerivedStateFromError method in React Native?

To initialize state and bind event handlers
To render JSX elements
To handle errors that occur during rendering
The getDerivedStateFromError method in React Native is called when an error occurs during rendering, in any of the children of the component. It is used to update the component's state in response to the error, allowing it to render an error UI.
To update the component's state

What is the purpose of the getSnapshotBeforeUpdate method in React Native?

To initialize state and bind event handlers
To render JSX elements
To get a snapshot of the DOM before a component update
The getSnapshotBeforeUpdate method in React Native is called right before the changes from the virtual DOM are to be reflected in the DOM. It allows you to capture some information from the DOM before it is potentially changed.
To update the component's state

Powered by React JS Quiz