Correct Answer:
Destructuring assignment
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
To directly access the DOM node
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
You are using the development build of React.
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Correct Answer:
To split your app into smaller chunks that can be more easily loaded by the browser
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Correct Answer:
Right after the component is added to the DOM
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Correct Answer:
Disabled
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Correct Answer:
A function or a class
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Correct Answer:
Use prop-types.
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Correct Answer:
JSX
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Correct Answer:
JQuery
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Correct Answer:
React Developer Tools
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Correct Answer:
Create-react-app
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Correct Answer:
Facebook
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
Reconciliation
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Correct Answer:
When iterating over the list items, add a unique property to each list item.
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Correct Answer:
Public/index.html
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Correct Answer:
The DOM element that exists outside of the parent component
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Correct Answer:
A function to update the state
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Correct Answer:
The element to render
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Correct Answer:
The element that should be created
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Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
SetState
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
When isLoggedIn is true
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Correct Answer:
One of the component's siblings rerenders
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Correct Answer:
No library. fetch() is supported by most browsers.
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
A function component accepts a single props object and returns a React element.
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Correct Answer:
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
React.lazy
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Correct Answer:
UseEffect(function updateTitle() { document.title = name + ' ' + lastname; });
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Correct Answer:
Use the defaultValue property.
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
ReactDOM
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Correct Answer:
SetState is asynchronous and might result in out of sync values.
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Correct Answer:
A callback function that is called once for each element in the array
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Correct Answer:
Pure functions
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Correct Answer:
By nesting components
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Correct Answer:
ComponentDidMount
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Correct Answer:
Error boundaries
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Correct Answer:
Const
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Correct Answer:
Virtual DOM
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Correct Answer:
To preprocess files
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Correct Answer:
Declarative
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Correct Answer:
DangerouslySetInnerHTML
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Correct Answer:
A property that lets you pass components as data to other components
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Correct Answer:
Because you want to allow a component to update in response to changes in the props
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Correct Answer:
When you want a default implementation of shouldComponentUpdate()
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Correct Answer:
When you need the browser to paint before the effect runs
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Correct Answer:
React.lazy
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Correct Answer:
This is a route parameter
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Correct Answer:
All of them
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Correct Answer:
When you need to manage more complex state in an app
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Correct Answer:
Babel
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Correct Answer:
React Context
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Correct Answer:
Jest
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Correct Answer:
Wrap it in the React.memo higher-order component.
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Correct Answer:
Import { Component } from 'react'
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Correct Answer:
By Using .bind(this) in constructor.
By Declaring function as a class property.
Note: This question has more than 1 correct answers
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Correct Answer:
With "defaultValue" attribute.
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Correct Answer:
ReactDOM.hydrate
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Correct Answer:
getDerivedStateFromProps is called before the first render while componentWillReceiveProps don't.
You must call this.setState in componentWillReceiveProps in order to update component state.
Note: This question has more than 1 correct answers
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Correct Answer:
Virtual DOM
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Correct Answer:
Yes, but you must use React Fragment.
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Correct Answer:
With stopPropagation function.
With preventDefault function.
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Correct Answer:
Whole React component tree gets unmounted.
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Correct Answer:
__DEV__
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Correct Answer:
Using Context.
Using flux architecture.
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Correct Answer:
Dispatcher
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Correct Answer:
Using static type checkers like Flow and TypeScript.
Using PropTypes.
Note: This question has more than 1 correct answers
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Correct Answer:
shouldcomponentUpdate()
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Correct Answer:
All of the above
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Correct Answer:
State is similar to props, but it is private and fully controlled by the component.
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Correct Answer:
Updates DOM-tree
Reacts on events
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Can a single component render multiple nodes?
Correct Answer:
Only if all children are wrapped with some node
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How can SyntheticEvent be stopped?
Correct Answer:
Fire stopPropagation on event object
Fire preventDefaults on event object
Note: This question has more than 1 correct answers
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The defaultValue and defaultChecked props are only used during initial __?
Correct Answer:
render
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What will be removed by JSX from the string inside node?
Correct Answer:
New lines in the middle of a string
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Which value will render nothing? (Check all that apply)
Correct Answer:
null
false
undefined
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Is it possible to create ReactJS components without JSX?
Correct Answer:
Yes
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Which of the following is a correct JSX code?
Correct Answer:
<button onClick={activate}>Activate</button>
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Which of the following are valid properties of the input node in ReactJS?
Correct Answer:
All of the above
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What is true about forceUpdate method in component?
Correct Answer:
It will re-render component skipping shouldComponentUpdate event
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What is true about context inside a component?
Correct Answer:
nextContext can be accessed at shouldComponentUpdate
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What is the correct value of the children proptype? propTypes: { children: React.PropTypes.string.isRequired }
Correct Answer:
'test1'
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Which of the following is the correct data flow in a flux application?
Correct Answer:
Action->Dispatcher->Store->View
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What can be stored in the Stores while building with flux architecture?
Correct Answer:
Application state and logic
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Which statement is valid for ReactDOM.findDOMNode() function?
Correct Answer:
It returns the corresponding native browser DOM element
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What values can be passed as children of a ReactJs component?
Correct Answer:
All of the above
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Which function is invoked just before render() during initial rendering?
Correct Answer:
componentWillMount()
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What would happen if the state is updated in componentWillMount?
Correct Answer:
State can't be updated in this method
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Which of the following will not allow an event to be accessed?
Correct Answer:
Asynchronous
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Which of the following properties are available for a wheel event? (Check all that apply)
Correct Answer:
deltaMode
deltaX
Note: This question has more than 1 correct answers
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Which of the following are valid component life cycle events? (Check all that apply)
Correct Answer:
componentWillUnmount
componentWillUpdate
Note: This question has more than 1 correct answers
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Which of the following is a valid Composition Event?
Correct Answer:
onCompositionUpdate
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Which of the following functions belong to ReactDOM? (Check all that apply)
Correct Answer:
render()
findDOMNode()
Note: This question has more than 1 correct answers
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What are component methods? (choose all that apply)
Correct Answer:
replaceState(newState)
setState(changes)
forceUpdate():
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
In controlled components, which is the correct way to select multiple values using the select drop-down?
Correct Answer:
<select defaultValue={["lahore", "london"]} multiple={true}> <option value="lahore">welcome lahore!</option> <option value="london">welcome london!</option> <option value="toronto">welcome toronto</option> </select>
Note: This Question is unanswered, help us to find answer for this one
Which following method is used for updating the state of the component?
Correct Answer:
setState()
Note: This Question is unanswered, help us to find answer for this one
What are the Animation Events? (choose all that follow)
Correct Answer:
onAnimationStart
onAnimationEnd
onAnimationIteration
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Which of the following code examples is correct for State object usage?
Correct Answer:
this.setState(function(previousState, currentProps) { return {counter: previousState.counter + 1}; });
Note: This Question is unanswered, help us to find answer for this one
What are the Component properties? (choose all that apply)
Correct Answer:
this.isMounted
this.props
this.state
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
The lifecycle methods can be grouped into the following categories?
Correct Answer:
unmounting
updating
mounting
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
What are the Composition Events? (choose all that apply)
Correct Answer:
onCompositionUpdate
onCompositionStart
onCompositionEnd
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
The state of the application is stored in the _____, from where the data then flows to the views?
Correct Answer:
stores
Note: This Question is unanswered, help us to find answer for this one
How can you set the state of a component, retrieve that state, create properties when initializing the component? I'm learning ReactJs! {this.props.name}
Correct Answer: var stateComp = React.createClass({ propTypes : { name : React.PropTypes.string }, getDefaultProps : function(){ return { name : "Mike" } }, getInitialState : function(){ return { value : 1 } }, render : function(){ return (
Note: This Question is unanswered, help us to find answer for this one
In Redux a store has the following responsibilities? (choose all that apply)
Correct Answer:
Makes possible to unregister listeners by calling the function returned
Registers new listeners with subscribe(listener)
Holding application state
Note: This question has more than 1 correct answers
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Lifecycle methods will receive context and SETSTATE() TRIGGERS AN UPDATE as follows? (choose all that apply)
Correct Answer:
shouldComponentUpdate
componentWillReceiveProps
Note: This question has more than 1 correct answers
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Referencing context in lifecycle methods, the following lifecycle methods will receive an additional parameter in the context object? (check all that apply)
Correct Answer:
componentWillReceiveProps(nextProps, nextContext)
shouldComponentUpdate(prevProps, prevState, prevContext)
Note: This question has more than 1 correct answers
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Which of the following code syntax is True in createClass?
Correct Answer: var MyComponent = React.createClass({ render: function () { return
Note: This Question is unanswered, help us to find answer for this one
Which of the following are basic principles of Redux? (choose all that apply)
Correct Answer:
Changes are made with pure function
State is read-only
Note: This question has more than 1 correct answers
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Which of the following types can be the ReactNode?
Correct Answer:
Array of React Nodes, Plain Object, Array of Strings
ReactElement, String, number
Note: This question has more than 1 correct answers
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Which validator is used to check if property value is a number?
Correct Answer:
React.PropTypes.number
Note: This Question is unanswered, help us to find answer for this one
What is incorrect with the following component? class MyComponent extends React.Component { render() { return ( This is a component ); } }
Correct Answer:
react render
Note: This Question is unanswered, help us to find answer for this one
How many nodes should render() method return?
Correct Answer:
1
Note: This Question is unanswered, help us to find answer for this one
Which of the following correctly explains the term "mounting"?
Correct Answer:
A component is being inserted into the DOM.
Note: This Question is unanswered, help us to find answer for this one
Do you need to add key property on ReactJs elements?
Correct Answer:
Keys must be provided for list elements so ReactJs will know which element changed when state or props changes
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How to set ReactJS global configuration?
Correct Answer:
ReactJs does not provide global configuration
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Which of the following is correct transformation of the following JSX syntax code?
Correct Answer:
None of the above
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ReactJS is developed by _____?
Correct Answer:
Facebook
Note: This Question is unanswered, help us to find answer for this one
How write comments in JSX code?
Correct Answer:
{/*your comment*/}
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Which of the following is/are not a valid component event?
Correct Answer:
ondblclick
onblink
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Which is correct function to render ReactJs component at server side as static html page?
Correct Answer:
ReactDOMServer.renderToStaticMarkup
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What visual design guidelines must be used to build web UIs with ReactJs?
Correct Answer:
None
Note: This Question is unanswered, help us to find answer for this one
Which of the following are mounting methods?
Correct Answer:
componentWillMount, componentDidMount, render
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What does acronym JSX mean?
Correct Answer:
JavaScript XML
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Can you use ReactJs with AngularJs on same web application?
Correct Answer:
Yes
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Will and if yes, when and how immutable data will make big ReactJs application faster?
Correct Answer:
For complicated data structure immutable data provides faster comparison
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What is default css display value for ReactJs web application?
Correct Answer:
browser dependent
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Which statement about ReactJs is incorrect?
Correct Answer:
ReactJs alone can be used to write native applications for Android and iOS
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How set custom html inside ReactJs component?
Correct Answer:
div dangerouslySetInnerHTML={{__html: 'Some custom html'}} />
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Can you use ReactJs with NodeJS?
Correct Answer:
Yes, you can render ReactJs application on NodeJs server and deliver it to browser
Note: This Question is unanswered, help us to find answer for this one
Which of the following is the primary mental data flow in Flux?
Correct Answer:
action -> dispatcher -> store -> view
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PropTypes is used for ___ ?
Correct Answer:
typechecking
Note: This Question is unanswered, help us to find answer for this one
Can you use ReactJs without flux?
Correct Answer:
Yes
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Which JSX syntax is incorrect?
Correct Answer:
Buttons.Fab />
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Which of the following is the correct way to create links for the react component?
Correct Answer:
a href={'https://www.facebook.com/'}>Link1
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Which of the following are Flux Elements?
Correct Answer:
All of the above
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What is wrong with the following code? MyComponent.propTypes = { name: React.PropTypes.string } MyComponent.defaultProps = { name: 'My name' }
Correct Answer:
default value is not necessary
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Which of the following attributes is used to set the default value of an input field?
Correct Answer:
Both of the above
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ReactJS renders HTML tags if the element is defined in __
Correct Answer:
Lowercase
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What does the following code do? componentDidMount () { this.context.router.replace('login')) }
Correct Answer:
redirect router directory
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What does ReactJs provide?
Correct Answer:
Sync between DOM and data
Note: This Question is unanswered, help us to find answer for this one
Which of the following are correct React PropTypes? Check all that apply.
Correct Answer:
symbol
node
array
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
What will the following code do?
Correct Answer:
LogoutContainer
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What kind of application architecture is widely used together with ReactJs?
Correct Answer:
Flux
Note: This Question is unanswered, help us to find answer for this one
What is needed to write ReactJs application with ES6 classes and have cross-browser support?
Correct Answer:
Babel with react and es2015 presets
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What will happen if parent component will fire render function?
Correct Answer:
Child components will fire shouldComponentUpdate
Note: This Question is unanswered, help us to find answer for this one
Which of the following methods enables to set the initial state value, that is accessible inside the component via this.state?
Correct Answer:
getInitialState
Note: This Question is unanswered, help us to find answer for this one
Which function is invoked immediately before the initial rendering occurs?
Correct Answer:
componentWillMount()
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Which of the following Lifecycle Methods does React include?
Correct Answer:
ComponentWillMount
ShouldComponentUpdate
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
What will happen to the state if you click the
Correct Answer:
updates the status state to 'I am fine'
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Which of the following methods change the state of the component?
Correct Answer:
Both of the above
Note: This Question is unanswered, help us to find answer for this one
What is the first place to start optimizing speed of ReactJs application?
Correct Answer:
Use component events to reduce render function calls
Note: This Question is unanswered, help us to find answer for this one
To disable animations, you can add _____?
Correct Answer:
transitionEnter={false}
transitionLeave={false}
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
data
ReactText
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
describe
It
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
this.props
this.state
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
Header
Tweet
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
string
ReactClass
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
Tab
Shift+Tab
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
This method is used for reading values out of the DOM.
It can only be used on the mounted components.
Note: This question has more than 1 correct answers
Note: This Question is unanswered, help us to find answer for this one
In relation to ReacUS, which of the following content should be added to the .eslintrc file which is created in the root of the project for enabling more accessibility rules?
Correct Answer:
{
"extends": ["react—app", "plugin:jsx—aily/recommended'].
"plugins": ["jsx—a11y"]
L
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
C:\Users\username\Desktop>mkdir reactApp
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Correct Answer:
Nodejs
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After installing Jest CLI. the below given script object of packagejson file are edited. It should be replaced with which of the following options?
Correct Answer:
"scripts":[
"test": "jest"
}
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In ReactJS, which of the following key syntaxes should be used if you do not have stable IDs for rendered items?
Correct Answer:
const exampleItems = examples.map((example, index) =>
<li key={index}>
{example.text}
</li>
);
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
It will perform an update on it and will only mutate the DOM as necessary for reflecting the latest React element.
Note: This Question is unanswered, help us to find answer for this one
Which of the following code snippets should be there in place of "???" in the below given program so that the following output is printed on the console?
Program
function ListItem(props) {
return <li>{props.value}</li>;
}
function NList(props) {
const numbers = props.numbers;
return (
<ul>
???
</ul>
);
}
const numbers = [8, 6, 4, 2, 1];
ReactDOM.render(
<NList numbers={numbers} />,
document.getElementById('root')
);
Output
• 8
• 6
• 4
• 2
• 1
Correct Answer:
{numbers.map((number) =>
<ListItem key={number.toString()}
value={number} />
)}
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Consider the given render method which is required to return the content enclosed inside parentheses.
render: function0{
return (
<div> Render me here </div>
);
}
In relation to the given information, which of the following statements is/ are true?
1. If JSX starts on the same line as the return. then parentheses are not needed.
2. Without the parentheses, JavaScript will ignore the given lines and return without a value.
Correct Answer:
Both statements 1 and 2
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Select True or False.
If the order of items may change in React then the use of indexes should be used for keys.
Correct Answer:
False
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
react-axe
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
npm install --save-dev babel-jest
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
type
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
testInstance.type
Note: This Question is unanswered, help us to find answer for this one
Which of the given render methods is correctly written?
Correct Answer:
render(){
return (<div>
[this.renderThis()]
[this.renderThat0]
</div>);
return [
<li key="List1">List1<lli>,
<li key="List2">List 2</li>,
<|i key="List3">List 3<l|i>.
];
}
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
Multiple React components should be composed into a single React component.
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
React.Fragment
Note: This Question is unanswered, help us to find answer for this one
Correct Answer:
The data flow is uni-directional.
Note: This Question is unanswered, help us to find answer for this one
Which of the following commands are used for installing React and React DOM? (Consider reactApp as the root folder.)
Correct Answer:
C:\Users\username\Desktop\reactApp>npm install react --save
C:\Users\username\Desktop\reactApp>npm install react-dom --save
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Correct Answer:
React.Children.only(children)
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Which of the following options is the correct syntax for creating a new folder named Dispatcher in a project's ”/snapterest/ source/exampleDispatch directory?
Correct Answer:
var Dispatcher = require('fiux‘).Dispatchen
module.exports = new Dispatchero;
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Which of the following is the correct syntax for creating a ReactElement of type h1 having the properties object and a ReactText as its only child?
Correct Answer:
[
render: function 0{
return React.createElement('h1'. [ className: ‘header' ], ‘React
Component‘);
I
I
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Which of the following is the correct syntax of React function that will enforce that names are written with all uppercase letters?
Correct Answer:
handleChange(event)[
this.setState({valuezeventtarget.value.toUpperCase0));
}
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Correct Answer:
npm install react-addons-css-transition-group
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Correct Answer:
sudo npm install —g jest
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Correct Answer:
componentDidUpdate()
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Correct Answer:
It
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While validating React component properties. a custom validator function is used for validating the tweet property. Which of the following parameters are passed to this function?
i) properties
ii) propertyName
iii) media
iv) componentName
Correct Answer:
Only options i), ii) and iv).
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Correct Answer:
componentWillUpdate()
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Correct Answer:
Only select function
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Correct Answer:
Test Renderer
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Correct Answer:
SynthetiCEvent
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Correct Answer:
Collection
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Correct Answer:
Both options a and b.
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Choose True or False
In relation to React Flux, only the root component should be aware of a redux.
Correct Answer:
True
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