Clock
Test duration:
35
min
Notes
No. of questions:
12
Tie
Level of experience:
Entry Level/Mid/Senior

React.js Test

The Reactjs online test helps tech recruiters and hiring managers to evaluate candidates’ skills. The React.js assessment helps hire for various job roles, including React.js Developer, JavaScript Developer, Front End Developer, React.js Consultant, and Fullstack Developer. Our tests help build winning teams by increasing the interview-to-selection ratio by up to 62% and reducing hiring time by up to 45%.

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Assessed
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Organizations Served
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About

React.js Online Test

Today, front-end frameworks and libraries have become essential to modern web development. React.js is an open-source JavaScript library that has gradually become the go-to framework for modern web development. With React.js, developers can create large web applications that use data and change over time without reloading the page. iMocha's React.js online test uses scenario-based MCQ and AI-LogicBox questions to evaluate the understanding of the React component lifecycle.

Two important use cases for Reactjs Online Test

#1 Identifying job-fit candidates based on job roles

You can create customized skill assessments for any given job role. Using this feature, you can choose questions from different skill types, including functional, technical, and soft skills. For example, with our customized Reactjs assessments, you can evaluate candidates’ knowledge of Mounting Method, React Facts, Password Principles, Handling Events, and Communication Skills and assess the best individuals for the job.

#2 Skill-gap analysis of your employees

iMocha allows you to measure employees' skill competency through Reactjs training assessments. It determines the existing skill level and identifies the areas for growth. It also measures the knowledge and impact of the training and traces individual employees’ progress. For example, you can use our Reactjs training assessments to identify a consultant’s knowledge about Handling Events, React Facts, and other skills and perform a skill gap analysis.

Use iMocha's assessment to hire skill fit, remove bias, and save money!
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How it works

Test Summary

React Developer test helps employers to hire job-fit candidates quickly, making unbiased employee performance appraisal decisions, reducing mass recruitment hassles, and more. Questions on mounting method, render function, password principles, and component optimization also helps you assess candidate's React JS skills. Our React JS coding test can be taken online by candidates from anywhere irrespective of timezone.

The Reactjs skills test helps you to screen candidates possessing the following skills:

1. Thorough understanding of React.js and its core principles.

2. Ability to develop user interface components and implementation using popular React.js workflows such as Flux or Redux.

3. Excellent knowledge of core web fundamentals like HTML5, JavaScript (DOM manipulation and the JavaScript object model), and CSS3.

4. Familiarity with server-side scripting knowledge and interfacing.

5. Strong experience working with data structure libraries.

6. Use our React.js assessment test or ask us to create a custom-made test including a skill set as per the job description.

Test Creation Process

Our different types of React.js online test will help you assess candidates' specific skills. These assessments are created by React.js specialists using their industry experience. Example: questions are on topics including Mounting Method, Render Function, Component Optimize, Handling Events, Default Values for Properties, etc

You can pick the questions you like or request us to create more questions if required.

Test Analytics Report

Our React.js coding test reports are quick and provide insightful data, which will help you select relevant candidates for interview. You can use our role-based access control feature to restrict system access based on the roles of individual users within the recruiting team. Features like window violation and webcam proctoring help detect cheating while candidates attempt the React developer test.

Test Question Format

The React technical test may contain MCQs (Multiple Choice Questions), MAQs (Multiple Answer Questions), Fill in the Blanks, Whiteboard Questions, Audio / Video Questions, AI-LogicBox (AI-based Pseudo-Coding Platform), Coding Simulators, True or False Questions, etc.

Test Design Guidelines

React.js test is designed considering EEOC guidelines; it will help you assess and hire diverse talent without bias.

Test Duration
35
No. of Questions
12
Level of Expertise
Entry Level/Mid/Senior
Useful for hiring
  • React.js Developer
  • JavaScript Developer – React.js
  • Front End Developer – React.js
  • React.js Consultant
  • Fullstack Developer – React.js
Topics Covered
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Mounting Method

Mounting method means putting elements into the DOM. React.js has four built-in methods that gets called, in this order, when mounting a component: constructor(), getDerivedStateFromProps(), render(), componentDidMount().

Render Function

The React function takes two arguments, HTML code and an HTML element. The purpose of this function is to display the specified HTML code inside the specified HTML element.
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Password Principles

Here are some of the password principles you should follow to secure your React applications: Secure basic authentication of your React app, make sure that the HTML code is resilient, use allow list/blocklist and validation while URL parsing, and Implement a Web Application Firewall (WAF).
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Component Optimize

In React, function components and PureComponent provide two different ways of optimizing React apps at the component level. Function components prevent constructing class instances while reducing the overall bundle size as it minifies better than classes.
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Default Values for Properties

The defaultProps is a React component property that allows you to set default values for the props argument.
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Handling Events

Just like HTML DOM events, react can perform actions based on user events. React has the same events as HTML: click, change, mouseover etc.
Sample Question
Choose from our 100,000+ questions library or add your own questions to make powerful custom tests.

Question types :

Multiple Option

Topic:

Difficulty:

Hard


Q 1. You have been asked to train « Naive Bayes model for spam detection dataset

Using Python command, what wil you add in the given code at XXXX to deciore, it and train your modal for the given dataset?

import numpy os np

X= nporroyll 3. 2b[1 21 [2.21.[3,21)
Y= nporray(fi.a,a.1))

XXXX

from skinamnaive_bayas import

Gaussianna

otf = Gaussianne()

ceataie(x ¥)

from skinamnaive_bayas import

Gaussianna

otf = Gaussianne()

ceataie(x ¥)

from skinamnaive_bayas import

Gaussianna

otf = Gaussianne()

ceataie(x ¥)

from skinamnaive_bayas import

Gaussianna

otf = Gaussianne()

ceataie(x ¥)

Question types :

Multiple Option

Topic:

Machine teaming

Difficulty:

Hard


Q 1. Q2 Lets assume that you have 6 Pandas DataFrome(af) in the below tole.

Index Code Open High
0 AAPL 19877 70074
1 AAPL 19877 70074
2 AAPL 19877 70074
3 AAPL 19877 70074
4 AAPL 19877 70074

When the following commend is executed, what hoppens to the DatoFrome?

df= defiinat()
Y= nporray(fi.a,a.1))

Index Code Open High
0 AAPL 19877 70074
1 AAPL 19877 70074
2 AAPL 19877 70074
3 AAPL 19877 70074
4 AAPL 19877 70074
Index Code Open High
0 AAPL 19877 70074
1 AAPL 19877 70074
2 AAPL 19877 70074
3 AAPL 19877 70074
4 AAPL 19877 70074
it gives an error becouse of the third row which has on empty string.
None of these

Question types :

Multiple Answer

Topic:

Fragments

Difficulty:

Medium

Question:

How do you create a component with multiple elements and no parent?
<Fruits />


Options

  • const Fruits = props =&gt; [<br />&nbsp; &nbsp; &lt;div key=&quot;apple&quot;&gt;Apple&lt;/div&gt;,<br />&nbsp; &nbsp; &lt;div key=&quot;orange&quot;&gt;Orange&lt;/div&gt;<br />&nbsp; &nbsp; ];<br />&nbsp;
  • const Fruits = props =&gt; (<br />&nbsp; &nbsp; &lt;React.Fragment&gt;<br />&nbsp; &nbsp; &lt;div key=&quot;apple&quot;&gt;Apple&lt;/div&gt;<br />&nbsp; &nbsp; &lt;div key=&quot;orange&quot;&gt;Orange&lt;/div&gt;<br />&nbsp; &nbsp; &lt;/React.Fragment&gt;<br />&nbsp; &nbsp; ) ;<br />&nbsp;
  • const Fruits = [&#39;Apple&#39;, &#39;Orange&#39;].map(fruit =&gt; &lt;div key={fruit}&gt;{fruit}&lt;/div&gt;);<br />&nbsp;
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You can customize this test by
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Setting the difficulty level of the test

Choose easy, medium, or tricky questions from our skill libraries to assess candidates of different experience levels.
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Adding your own
questions to the test

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Requesting a tailor-made test

Receive a tailored assessment created by our subject matter experts to ensure adequate screening.

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Now my team of 25 recruiters has adopted this measure and it has done wonders for our clients. Thanks to the Customer Success Team of iMocha. They have shared the best practices of quick test creation and also helped us in training all our recruiters for various functionalities of the tool.
Client

Vipin Sharma,

Mobile Programming
FAQ
What is Data Science?
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.NET Design Pattern test helps recruiters to evaluate candidates' ability to work on GOF Decorator Design Pattern to solve recurring design problems and design flexible and reusable object-oriented software

Why use iMocha’s online data science test?
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What are the key skills that recruiter should look for while hiring a Data Scientist?
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What are few interview questions that recruiter/hiring manager should ask while hiring a data scientist?
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How do you assess the data scientists?
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How is Reactjs online test customized?
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We can customize this React.js online test to suit your needs. Our SMEs will refer to the job description and customize the assessments based on the required skills needed. Some include Mounting Method, Component Optimize, Handling Events, etc. Likewise, you can choose the difficulty level to assess candidates of different experience levels.

What are the certifications required for this role?
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There are multiple courses online that provide a React JS Certification course. These React JS Certifications will help you learn all the necessary concepts to be a React JS developer. Here are the top 5 courses that provide you a React JS Certification upon completion.

• Learn React – The complete React JS guide from Udemy

• React JS Certification – Full Stack Web Developer by Coursera

• Best React JS Course – Modern React with Redux from Udemy

• Learning React.js Training Couse – Lynda – LinkedIn Learning

• The Complete React Web Developer Course

What are the most common interview questions for this role?
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Companies are looking to hire React developers because React is a popular and powerful tool for building user interfaces. As more and more companies move to the web and mobile platforms, they need skilled developers who can create fast, efficient, and scalable applications. React provides a great way to do this, and so there is high demand for developers who know how to use it.

Here's a list of all the common Reactjs interview questions that are frequently asked in interviews.

• What is JSX?

• What are the features of React?

• What is the virtual DOM?

• Why use React instead of other frameworks, like Angular?

• What is the difference between the ES6 and ES5 standards?

• What is an event in React?

What are roles and responsibilities of React developer?
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An efficient ReactJS developer should perform specific defined tasks and follow responsibilities to get the best results. Here are the major ones that any ReactJS developer is supposed to follow:

· Leverage the inbuilt React toolkit for creating frontend features

· Constant interaction with other developer teams and design teams to discuss UI ideas

· Follow proper documentation for changes in application and further updates

· Create data visualization tools, libraries, and reusable code for prospects

· Integrate designs and wireframes within the application code

· Monitor interaction of users and convert them into insightful information

· Write application interface code with JavaScript

What are the required skillsets of React developer?
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Some of the required skillsets are:

Technical Skills:

·     Strong proficiency in JavaScript, object model, DOM manipulation and event handlers, data structures, algorithms, JSX, and Babel.

·     Complete understanding of ReactJS fundamentals likeJSX, Virtual DOM, component lifecycle, etc.

·     Prior experience with ReactJS workflows like Flux, Redux,Create React App, and data structure libraries.

·     Understanding of RESTful APIs/GraphQL, HTML/CSS, ES6(variables and scoping, array methods), code versioning tools like GIT, SVN,etc., popular frontend development tools, CI/CD tools, DevOps, performancetesting frameworks like Mocha, Node + NPM.

·     Preferred degree in Computer Science, InformationTechnology, or similar.

 

SoftSkills:

·     Competence in translating business needs into technical requirements.

·     Open-minded team player, willing to accept feedback and offer suggestions.

·     Good time management, project management, communication, and interpersonal skills

·     Good problem-solving and troubleshooting skills.

What is the package of React developer?
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There are multiple factors based on which the salary structure of a ReactJS developer depends. The average ReactJS Developer's salary in US starts at $92,000.