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React JS Interview Questions and Answers
Home
Questions
React JS
0
votes
Q: Which of the following keyword is used to create a class inheritance?
answered
Apr 15
in
React JS
by
Robindeniel
class-inheritance
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following lifecycle events React components have at the highest level?
answered
Apr 15
in
React JS
by
Robindeniel
lifecycle-events
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Why is the usage of setState?
answered
Apr 15
in
React JS
by
Robindeniel
setstate
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following best defines the "key" prop?
answered
Apr 15
in
React JS
by
Robindeniel
key-prop
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following method is not a part of ReactDOM?
answered
Apr 15
in
React JS
by
Robindeniel
react-dom
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: How can you set a default value for an uncontrolled form field?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-field
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: We can update the state in React.js by calling to setState() method. These calls are:
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-setstate
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following statement is true for controlled components in React.js?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-component
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What changes would appear in the component as soon as the state of the React component is changed?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-component
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following statement is true for uncontrolled components in React.js?
answered
Apr 15
in
React JS
by
Robindeniel
uncontrolled-component
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: In which of the following condition, the React.js Lifecycle method static getDerivedSateFromProps(props, state) is called?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-method
getderivedsatefromprops
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What is the use of the create-react-app command in the React.js application?
answered
Apr 15
in
React JS
by
Robindeniel
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What is true for the keys given to a list of elements in React?
answered
Apr 15
in
React JS
by
Robindeniel
react-element
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following option is correct in the case of the Babel?
answered
Apr 15
in
React JS
by
Robindeniel
babel
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following is a must API for every React.js component?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-api
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: In which of the following directory React.js components are saved?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-directory
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What are the two ways to handle data in React?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-handle-data
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What is a state in React?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-state
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: How many ways of defining your variables in ES6?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-variables
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What is the declarative way to render a dynamic list of components based on values in an array?
answered
Apr 15
in
React JS
by
Robindeniel
dynamic-list
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: How many numbers of elements a valid react component can return?
answered
Apr 15
in
React JS
by
Robindeniel
react-component
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What is the default port where webpack-server runs?
answered
Apr 15
in
React JS
by
Robindeniel
webpack-server
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What would be the output of the following example?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-code
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following acts as the input of a class-based component?
answered
Apr 15
in
React JS
by
Robindeniel
class-component
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: A class is a type of function, but instead of using the keyword function to initiate it, which keyword do we use?
answered
Apr 15
in
React JS
by
Robindeniel
class-function
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: What of the following is used in React.js to increase performance?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-performance
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following command is used to install create-react-app?
answered
Apr 15
in
React JS
by
Robindeniel
install-create-react-app
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following is not a disadvantage of React.js?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-disadvantages
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following are the advantages of React.js?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs-advantages
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
0
votes
Q: Which of the following is the correct name of React.js?
answered
Apr 15
in
React JS
by
Robindeniel
reactjs
create-react-app
react-features
react-vs-vue
react-jsx
react-components
react-statereact-props
react-props-validation
react-state-vs-props
react-events
react-lists
react-keys
react-refs
react-fragments
react-router
react-css
react-animation
react-bootstrap
react-map
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