Por que você deve usar este teste de reação

Este teste avalia os candidatos sobre as seguintes habilidades: React os fundamentos em torno do estado, adereços e o ciclo de vida do componente Compreensão do DOM virtual e como o React executa a reconciliação Aproveitando os métodos do ciclo de vida para fazer chamadas de Ajax Reactar a navegação e a transferência de dados entre diferentes telas Lidar com código assíncrono usando retornos de chamada, promessas, geradores e funções assíncronas Conectando aplicativos de reação com bibliotecas de gerenciamento de estado Compreendendo a nova sintaxe de classe e criação de métodos de instância Criando ganchos e estruturas de contexto Junto com o React, o teste avalia os candidatos à capacidade de codificação de JavaScript usando MCQs baseados em cenário e perguntas de codificação. Os insights gerados a partir desta avaliação do React podem ser usados pelos recrutadores e gerentes de contratação para identificar os melhores candidatos a funções de reação.

Reactjs Teste online

About the test:

The React test uses scenario-based MCQ questions to evaluate the understanding of React component lifecycle, the ability to work with JSX, user events, React State, functional components, and Hooks to create dynamic React applications. The test has JavaScript MCQs to assess ES6 fundamentals, DOM, Fetch, Promises and Async / Await. The test includes coding questions to evaluate hands-on JavaScript programming skills.

Covered skills:

Building Content with JSX
Class-Based Components
Lifecycle Methods
Making API Requests with React
Using Refs for DOM Access
Component and Route Navigation
Integrating React with State management libraries
Using the Context System with React

Communicating with Props
React State
Handling User Input with Forms and Events
Building Lists of Records
Understanding Hooks in React
Deploying a React App
Handling Authentication with React

See all covered skills

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9 reasons why

Adaface Reactjs Teste online is the most accurate way to shortlist ReactJS Developers

Reason #1

Tests for on-the-job skills

Este teste avalia os candidatos sobre as seguintes habilidades:

React os fundamentos em torno do estado, adereços e o ciclo de vida do componente
Compreensão do DOM virtual e como o React executa a reconciliação
Aproveitando os métodos do ciclo de vida para fazer chamadas de Ajax
Reactar a navegação e a transferência de dados entre diferentes telas
Lidar com código assíncrono usando retornos de chamada, promessas, geradores e funções assíncronas
Conectando aplicativos de reação com bibliotecas de gerenciamento de estado
Compreendendo a nova sintaxe de classe e criação de métodos de instância
Criando ganchos e estruturas de contexto

Junto com o React, o teste avalia os candidatos à capacidade de codificação de JavaScript usando MCQs baseados em cenário e perguntas de codificação.

Os insights gerados a partir desta avaliação do React podem ser usados pelos recrutadores e gerentes de contratação para identificar os melhores candidatos a funções de reação.

Reason #2

No trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface ->

Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

Estes são apenas uma pequena amostra da nossa biblioteca de mais de 10.000 perguntas. As perguntas reais sobre isso React.js Online Test será não-googleable.

🧐 Question
Medium Context re-renders Context	Solve
Review the following React code: Pick the correct statements: A: The code renders 10 INDIAN RUPEE B: The code renders 10 SINGAPORE DOLLAR C: The code does not render anything and throws an error since JavaScript objects are not valid as React children D: When the currency portion is clicked, the parent component is re-rendered E: When the currency portion is clicked, parent component will skip the re-render because shouldComponentUpdate returns false F: Parent component can be converted to a functional component with memoization (useMemo or memo) to avoid the re-render
Medium Error Boundaries and Event handlers Error Boundaries	Solve
Review the following React code: Notice that clicking on ‘Click Me’ will invoke handleClick which will throw an error. Also note that, ErrorBoundaryOne throws the error in getDerivedStateFromError. What will be rendered once ‘Click Me’ is clicked? A: ErrorBoundaryOne will catch the error of MyComponent and <h1>C</h1> will be rendered B: ErrorBoundaryOne will catch the error of MyComponent and its own error, <h1>C</h1> will be rendered C: ErrorBoundaryTwo will catch the error of MyComponent and ErrorBoundaryOne, <h1>B</h1> will be rendered D: ErrorBoundaryTwo will catch the error of MyComponent and ErrorBoundaryOne, <h1>B</h1><h1>C</h1> will be rendered E: ErrorBoundaryTwo will catch the error of ErrorBoundaryOne. ErrorBoundaryOne will catch the error of MyComponent, <h1>B</h1> will be rendered F: Error thrown in the click handler is not caught by any error boundary, ‘Click Me’ button will be rendered
Medium Rhyme Reducer Hooks	Solve
Which of the following React code snippets - triggers the reducer ‘rhymeReducer’ to update the ‘song’ value to ‘Jack and Jill’ - renders the updated ‘song’ value - does not produce any errors/warnings
Medium Async Await Promises Promises Async-Await	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
Easy Bitcoin prices Axios Promises	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
Medium My Module Scope	Solve
What will the output of the following JavaScript code be?
Medium Promise Resolve Promises Async-Await	Solve
What does the following code output?
Easy Throw, Try, Async Promises Async-Await	Solve
What does the following JS code output?
Easy Registration Queue Logic Queues	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
Medium Visitors Count Strings Logic	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Medium Context re-renders Context	3 mins React	Solve
Review the following React code: Pick the correct statements: A: The code renders 10 INDIAN RUPEE B: The code renders 10 SINGAPORE DOLLAR C: The code does not render anything and throws an error since JavaScript objects are not valid as React children D: When the currency portion is clicked, the parent component is re-rendered E: When the currency portion is clicked, parent component will skip the re-render because shouldComponentUpdate returns false F: Parent component can be converted to a functional component with memoization (useMemo or memo) to avoid the re-render
	Medium Error Boundaries and Event handlers Error Boundaries	3 mins React	Solve
Review the following React code: Notice that clicking on ‘Click Me’ will invoke handleClick which will throw an error. Also note that, ErrorBoundaryOne throws the error in getDerivedStateFromError. What will be rendered once ‘Click Me’ is clicked? A: ErrorBoundaryOne will catch the error of MyComponent and <h1>C</h1> will be rendered B: ErrorBoundaryOne will catch the error of MyComponent and its own error, <h1>C</h1> will be rendered C: ErrorBoundaryTwo will catch the error of MyComponent and ErrorBoundaryOne, <h1>B</h1> will be rendered D: ErrorBoundaryTwo will catch the error of MyComponent and ErrorBoundaryOne, <h1>B</h1><h1>C</h1> will be rendered E: ErrorBoundaryTwo will catch the error of ErrorBoundaryOne. ErrorBoundaryOne will catch the error of MyComponent, <h1>B</h1> will be rendered F: Error thrown in the click handler is not caught by any error boundary, ‘Click Me’ button will be rendered
	Medium Rhyme Reducer Hooks	3 mins React	Solve
Which of the following React code snippets - triggers the reducer ‘rhymeReducer’ to update the ‘song’ value to ‘Jack and Jill’ - renders the updated ‘song’ value - does not produce any errors/warnings
	Medium Async Await Promises Promises Async-Await	2 mins JavaScript	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
	Easy Bitcoin prices Axios Promises	2 mins JavaScript	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
	Medium My Module Scope	2 mins JavaScript	Solve
What will the output of the following JavaScript code be?
	Medium Promise Resolve Promises Async-Await	2 mins JavaScript	Solve
What does the following code output?
	Easy Throw, Try, Async Promises Async-Await	2 mins JavaScript	Solve
What does the following JS code output?
	Easy Registration Queue Logic Queues	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Medium Visitors Count Strings Logic	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Context re-renders Context	React	Medium	3 mins	Solve
Review the following React code: Pick the correct statements: A: The code renders 10 INDIAN RUPEE B: The code renders 10 SINGAPORE DOLLAR C: The code does not render anything and throws an error since JavaScript objects are not valid as React children D: When the currency portion is clicked, the parent component is re-rendered E: When the currency portion is clicked, parent component will skip the re-render because shouldComponentUpdate returns false F: Parent component can be converted to a functional component with memoization (useMemo or memo) to avoid the re-render
	Error Boundaries and Event handlers Error Boundaries	React	Medium	3 mins	Solve
Review the following React code: Notice that clicking on ‘Click Me’ will invoke handleClick which will throw an error. Also note that, ErrorBoundaryOne throws the error in getDerivedStateFromError. What will be rendered once ‘Click Me’ is clicked? A: ErrorBoundaryOne will catch the error of MyComponent and <h1>C</h1> will be rendered B: ErrorBoundaryOne will catch the error of MyComponent and its own error, <h1>C</h1> will be rendered C: ErrorBoundaryTwo will catch the error of MyComponent and ErrorBoundaryOne, <h1>B</h1> will be rendered D: ErrorBoundaryTwo will catch the error of MyComponent and ErrorBoundaryOne, <h1>B</h1><h1>C</h1> will be rendered E: ErrorBoundaryTwo will catch the error of ErrorBoundaryOne. ErrorBoundaryOne will catch the error of MyComponent, <h1>B</h1> will be rendered F: Error thrown in the click handler is not caught by any error boundary, ‘Click Me’ button will be rendered
	Rhyme Reducer Hooks	React	Medium	3 mins	Solve
Which of the following React code snippets - triggers the reducer ‘rhymeReducer’ to update the ‘song’ value to ‘Jack and Jill’ - renders the updated ‘song’ value - does not produce any errors/warnings
	Async Await Promises Promises Async-Await	JavaScript	Medium	2 mins	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
	Bitcoin prices Axios Promises	JavaScript	Easy	2 mins	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
	My Module Scope	JavaScript	Medium	2 mins	Solve
What will the output of the following JavaScript code be?
	Promise Resolve Promises Async-Await	JavaScript	Medium	2 mins	Solve
What does the following code output?
	Throw, Try, Async Promises Async-Await	JavaScript	Easy	2 mins	Solve
What does the following JS code output?
	Registration Queue Logic Queues	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Visitors Count Strings Logic	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

Reason #4

1200+ customers in 75 countries

Com o Adaface, fomos capazes de otimizar nosso processo de triagem inicial em mais de 75%, liberando tempo precioso para os gerentes de contratação e nossa equipe de aquisição de talentos!

Brandon Lee, Chefe das pessoas, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment React.js Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the React.js Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

Reason #7

Detailed scorecards & benchmarks

Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

Reason #9

Advanced Proctoring

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Como você personaliza o teste para desenvolvedores de reagências seniores?

As perguntas usadas para os testes de desenvolvedor de reactos seniores são baseados em tópicos avançados do React. Aqui estão alguns tópicos avançados que abordamos:

Usando Babel e Webpack para transpilar e pacote de código
Entender como o JavaScript lida com o código assíncrono usando o loop do evento com a pilha, pilha e fila
Usando os portais do React para renderizar crianças fora da hierarquia Dom
Limpando o código usando funções de seta e a ligação do método mestre sem usar a palavra -chave de ligação
manipulação de autenticação com reação
Melhorando o desempenho dos aplicativos React (divisão de código, balanceamento de carga, cache, otimizações de código)
Trabalhando com versões mais antigas do React
Substituindo bibliotecas de gerenciamento de estado como o Redux pelo contexto
Implementando animações no React

What roles can I use the React.js Online Test for?

ReactJS Developer
Software Developer (React)
Full Stack Web Developer
Front End Engineer (React)
Software Engineer (ReactJS)
Web Developer
Senior ReactJS Developer
JavaScript Engineer (React)
Senior Web Engineer

What topics are covered in the Reactjs Teste online?

Componentes baseados em classe

Componentes funcionais

Adereços

Estado

Eventos

Listas

Ganchos embutidos

Ganchos personalizados

Componentes com estilo

Módulos CSS

Fragmentos

Portais

Lidar com efeitos colaterais

Estados de transição

Formulários e entradas

Gerenciamento do Estado

Roteamento e navegação

Autenticação

Animações

Webpack

Flexbox

Contexto

uso

useeffect

UserEduces

UseContext

Redutor

Autenticação JWT

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Os gerentes de contratação sentiram que, através das perguntas técnicas que fizeram durante as entrevistas do painel, foram capazes de dizer quais candidatos tinham pontuações melhores e se diferenciaram com aqueles que não marcaram também. Eles são altamente satisfeito com a qualidade dos candidatos selecionados com a triagem do Adaface.

85%

Redução no tempo de triagem

Veja o estudo de caso completo

React.js Online Test FAQs

Posso avaliar o React e o TypeScript no mesmo teste?

Sim. Depois de mudar para um plano pago, você pode solicitar uma avaliação personalizada. Personalizamos a avaliação de acordo com a descrição do seu trabalho e apoiamos a avaliação de várias habilidades na mesma avaliação.

Can I evaluate React, JavaScript and HTML/ CSS in the same test?

Yes. The test already comes with MCQs to evaluate JavaScript fundamentals and coding questions to evaluate hands-on JavaScript programming skills. We can customize the test to include MCQ questions to evaluate HTML/ CSS skills.

Posso combinar várias habilidades em uma avaliação personalizada?

Sim absolutamente. As avaliações personalizadas são configuradas com base na descrição do seu trabalho e incluirão perguntas sobre todas as habilidades obrigatórias que você especificar.

Você tem algum recurso anti-trapaça ou procurador?

Temos os seguintes recursos anti-trapaça:

Perguntas não-goleadas
IP Proctoring
Web Proctoring
Proctoring da webcam
Detecção de plágio
navegador seguro

Leia mais sobre os Recursos de Proctoring.

Como interpreto as pontuações dos testes?

O principal a ter em mente é que uma avaliação é uma ferramenta de eliminação, não uma ferramenta de seleção. Uma avaliação de habilidades é otimizada para ajudá -lo a eliminar os candidatos que não são tecnicamente qualificados para o papel, não é otimizado para ajudá -lo a encontrar o melhor candidato para o papel. Portanto, a maneira ideal de usar uma avaliação é decidir uma pontuação limite (normalmente 55%, ajudamos você a comparar) e convidar todos os candidatos que pontuam acima do limiar para as próximas rodadas da entrevista.

Para que nível de experiência posso usar este teste?

Cada avaliação do Adaface é personalizada para a descrição do seu trabalho/ persona do candidato ideal (nossos especialistas no assunto escolherão as perguntas certas para sua avaliação de nossa biblioteca de mais de 10000 perguntas). Esta avaliação pode ser personalizada para qualquer nível de experiência.

Todo candidato recebe as mesmas perguntas?

Sim, facilita muito a comparação de candidatos. As opções para perguntas do MCQ e a ordem das perguntas são randomizadas. Recursos anti-traking/proctoring no local. Em nosso plano corporativo, também temos a opção de criar várias versões da mesma avaliação com questões de níveis de dificuldade semelhantes.