React js interview questions
Express Your JS Interview Questions
1) What is Reaction JS?
2) List some of the benefits of ReactJS?
3) What are the components of Reaction JS?
4) What is JSX?
5) Define the life of reactive JS components?
6) List some of the features of React JS?
7) How to use events in ReactJS?
8) What is the flow in javascript?
9) What are React J? When to use it.
10) What are the stateless ingredients in ReactJS?
11) What is the difference between props in states and
limits and reactions?
12) What are artificial events?
13) What is the difference between Doom and Virtual Doom
in React JS?
14) List the advantages and disadvantages of ReactJS?
15) What are Controlled Components and Uncontrolled
Components in ReactJS?
17) What do you think of React J through mixin or high
order ingredients?
18) How is the flow different from the redox?
19) How is ReactJS different from Angular.
20) What is the use of the arrow function in React JS?
21) What are the things in React JS?
22) What is the purpose of the () function (render) in
racket js?
Last Updated: December 06, 2019
Posted in Interview Questions,
22 questions
Express Your JS Interview Questions
Reactus is an open source JavaScript UI (user interface)
library, co-authored and overseen by Facebook and Instagram and a large group
of developers. It is designed to adapt your request status and allow you to
write code that inputs its status and returns the virtual DOM, manipulating the
DOM and handling events. Definitely a better way, which is really just a set.
Each brand wants to create an interactive UI for their
mobile users as it keeps them engaged for longer and results in more
conversions. In this way, brands select the best talent from the developer
community and offer them attractive packages. If you are a developer willing to
join the industry, here are some React.js interview questions that answer all
the important elements of React Js. In this post, we've included some basic and
advanced feedback JS Interview Questions.
As such, these questions are compiled on React Js with
both basic and advanced questions. Preparing for your interview with these
questions will put you ahead of others and help you to break the exam.
Advanced Feedback JS Interview Questions
Below is a list of the Best React JS Interview Questions
and Answers
1) What is Reaction JS?
React JS is a JavaScript based UI library built on
Facebook to create interactive, state-of-the-art UI components. This is one of
the popular JavaScript frameworks that is configured to handle the presentation
layer for web and mobile apps.
VDOAA
2) List some of the benefits of ReactJS?
Benefits of reactive JS
React.js is extremely efficient: React.js creates its own
virtual DOM where your components really live. This approach gives you a lot of
flexibility and an amazing advantage in performance. React.js also calculates
what changes need to be made to the domain. This React.js process avoids costly
DOM operations and is very refreshing.
This makes it easy to write JavaScript: React.js uses a
special syntax called JSX, which allows you to blend HTML with JavaScript. The
user can drop a little HTML in the render function without adding wires, which
is another amazing thing. React.js converts bits of HTML into functions with a
special JSXTransformer.
It gives you out-of-the-box developer tools: When you
begin your journey with React.js, be sure to install the regular React.js
Chrome extension. This makes it easier to fix your application. After you
install the extension, you will have a direct look at the virtual DOM as if you
were viewing the regular DOM tree in the Elements panel. Isn't it amazing!
This is pretty good for SEO: The biggest problem with
other JavaScript frameworks is that they don't look engine friendly. Although there
has been some improvement in this area, search engines generally have
difficulty reading heavy JavaScript applications. React.js is separate from the
crowd because you can run React.js on the server, and the virtual DOM will be
presented as a regular web page in the browser.
UI Test Cases: Writing UI test cases is extremely easy
because the virtual DOM system is fully implemented in JS.
3) What are the components of Reaction JS?
React components let you split the UI into independent,
reusable pieces, and think of each piece separately.
Conceptually, the components are similar to the
JavaScript functions. They accept arbitrary inputs (called "props")
and return the elements that define what should appear on the screen.
JS Components React to Biology
Each component has several "lifecycle modes"
that you can override to run the code at certain times in the process. Methods
that are executed before a thing happens are called correct, and the methods
that are already occurring are called explicit.
growing
These methods are called when a component is being
developed and inserted into the domain:
Constructor ()
Ingredients Valmount ()
(Render)
Component History ()
Updating
An update may be due to supporters or changes to the
state. These methods are called when these components are being recreated
Offered:
Ingredients Wheel Recipes ()
shouldCompenderUpdate ()
Component Will Opt ()
(Render)
Component Dead Update ()
Countless
This method is called when removing a component from the
DOM:
Components against ()
Other APIs
Each component also provides some other APIs.
Set state ()
Strength update ()
Class Properties
already decided
Display name
Example properties
Proponent
6) List some of
the features of React JS?
Today, of course, React is one of the best JavaScript UI
frameworks. It comes with many features that help programmers easily create
beautiful applications, we've listed some of them below.
This is the adaptation
Free and open source
Decoration from ES7
Server Side Communication
Irrelevant functions and generators
Flux Library
Assignment construction
Jsx utility
Also, read the interview response questions
7) How to use events in ReactJS?
Using events is equivalent to handling events on Js DOM
elements.
The name of the event is React js always in the camel case.
With JSX you pass an event handler instead of a string.
To illustrate:
// in the HTML
<Button OnLink = "Active Account ()">
Activated account
</button>
// in response
Click <button = {active account}>
Activated account
</button>
The other difference is that in React js you cannot
return false to prevent the default behavior in the react function. You should
explicitly call Prevention Defaults.
8) What is the flow in javascript?
Flux is an application architecture for creating layers
of data in JavaScript applications. It was designed alongside the React View
library on Facebook. Flux is not a framework or library. It's just a new type
of architecture that caters to the concept of reactive and unidirectional data
flows.
9) What are React J? When to use it.
React is used to store the reference element or component
reference which causes a Ranger () configuration function. Reefs should be
avoided in most cases, however, they can be useful when we need a dome measure
or add methods to the components.
Reefs can be used in the following cases
Focus, text selection, or media playback management.
Animating dynamic animations.
Integrates with third party DOM libraries.
10) What are the stateless ingredients in ReactJS?
Non-state components are components that have no state.
When something is stateless, it calculates its internal state, but it never
changes it directly. State-class ingredients do not require any classes and
keywords. You can create state-equipped components using simple functions or
the S6 arrow function. The following is an example of a Bay Area component in
reaction.
// in S6
Cont pane = (support) =>
s props.children}
;
// in S5
const username = ({username}) =>
Login user is: {username}
11) What is the difference between props in states and limits and reactions?
Properties are shorthand for properties. This is very
similar to an argument in a pure JavaScript function. The component pointers go
through the parent component that asks for the component. During the life span
of an ingredient, they should not be considered for change. All support in the
React process may be available as well.
Import from 'React';
Welcome to the class responds. Components {
Render () nder
Return <h1> hello {this.prop.name} </h1>;
}
}
Fixed element =;
The State is used to create dynamic and interactive
components in a React. State is the heart of the process that brings it alive
and determines how the component performs and behaves.
// Simple example of a state
Import from 'React';
The class button expands the response. Components {
Constructor () {
Super ();
This.state = {
Count: 0,
};
}
update () (
this.setState ((prevState, props) => {
Return {count: prevState.count + 1
});
}
Render () nder
Back (<button)
onClick = {() => this.updateCount ()}
>
{this.state.count} times clicked
</button>);
}
}
Export default buttons
12) What are artificial events?
Artificial Event is a cross browser wrapper around the
browser native. All of you in response
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