Why you should use React & Redux Online Test?

The Test React & Redux en ligne makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects: Comprendre la syntaxe et les fonctions de base de JavaScript. L'application des fonctionnalités JavaScript ES6 telles que les fonctions de flèche, les littéraux de modèle et les affectations destructuration. Travailler avec JavaScript asynchrone, y compris les promesses et Async / Await. Mise en œuvre des fondamentaux React comme les composants, les accessoires et la gestion de l'État. Utilisation des crochets React pour la gestion de l'état des composants fonctionnels. Comprendre le cycle de vie des composants React et utiliser des méthodes de cycle de vie. Gérer l'État mondial à l'aide de Redux State Management. Gestion des demandes d'API asynchrones à l'aide de redux. Création d'actions Redux et de sélecteurs pour une gestion efficace de l'État. Implémentation de solutions de codage JavaScript pour divers problèmes.

React & Redux Online Test

About the test:

Le test React & Redux utilise des MCQ basés sur un scénario pour évaluer les candidats sur leur compétence dans le langage de programmation JavaScript et le développement ReactJS à l'aide de Redux. Le test a une question de codage pour évaluer l'expérience de codage JavaScript pratique.

Covered skills:

Syntaxe JavaScript
JS asynchrone
Réagir des crochets
Gestion de l'État redux
Actions et sélecteurs Redux

Javascript es6
React Fundamentals
Cycle de vie des composants react
Manipulation de l'API Redux
Codage javascript

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9 reasons why

Adaface React & Redux Test is the most accurate way to shortlist Développeur frontals

Reason #1

Tests for on-the-job skills

The React & Redux Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Capable d'utiliser efficacement react.js pour créer des interfaces utilisateur dynamiques
Capable de comprendre et de mettre en œuvre Redux pour la gestion de l'État
Compétent dans les fonctionnalités de syntaxe JavaScript et ES6
Habile à manipuler les opérations JavaScript asynchrones
Expérimenté avec les méthodes de cycle de vie des composants React
Adepte d'utiliser les crochets React pour les composants fonctionnels
Compétent dans la gestion des demandes et des réponses de l'API avec Redux
Compétent dans l'écriture des actions et sélecteurs redux
Capable de coder en javascript et de résolution de problèmes de programmation

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.

View sample questions

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

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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.

How we design questions

Ce ne sont qu'un petit échantillon de notre bibliothèque de plus de 10 000 questions. Les questions réelles à ce sujet Test React & Redux en ligne ne sera pas googleable.

🧐 Question
Medium Debugging Redux Actions and Reducers JavaScript ES6 Reducers Actions	Try practice test
A developer is working with a Redux application for managing todo items. After some changes to the code, they started facing a problem: When they try to add a new todo item, it doesn't appear on the list. However, deleting a todo item works as expected. Here is the error message they see in the console when trying to add a todo: `Cannot read property 'undefined' of undefined.` And here is the relevant Redux code: Which of the following changes will resolve the issue? A: Change payload to todo in addTodo action creator. B: Change action.todo to action.payload in todoReducer for ADD_TODO case. C: Change action.todo to action.payload in todoReducer for ADD_TODO case and change action.index to action.payload for DELETE_TODO case. D: Change payload to todo in addTodo action creator and index to payload in deleteTodo action creator.
Medium Debugging Redux with Complex State and Action JavaScript ES6 Reducers Actions Immutability Object manipulation	Try practice test
A developer is working on a Redux application where each action carries an array of items, and each item is an object with an `id` and `value`. The state is an object where each key is an item's `id` and each value is the item's `value`. However, they notice that the `ADD_ITEMS` action isn't updating the state as expected. Here is the relevant Redux code: What change should the developer make to correct the issue?
Medium Direct State Mutation in Redux JavaScript ES6 Reducers Actions Mutations	Try practice test
A developer is creating a Redux application to manage a list of blog posts. Each post is represented by an object with id, title, and content properties. The Redux state should store the post list as an array. The developer observes that the modifications to the posts are not reflecting in the components. Here is an example of what the state could look like: Here is the relevant Redux code: Which of the following changes will resolve the issue?
Hard Context re-renders React Context API Conditional Rendering Component Lifecycle State	Try practice test
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 Hooks with Conditional Rendering Hooks Conditional Rendering Event Handling	Try practice test
Consider a React functional component that utilizes various hooks and conditional rendering. The component is designed to fetch and display a list of items from an API, with the ability to filter the list based on user input. Here's the pseudo-code structure: In this component, which of the following is a potential issue or inefficiency? A: The component will re-render excessively due to the `setFilter` call. B: The `useEffect` hook will run on every render, causing performance issues. C: The `fetchItems` function may cause a memory leak if the component unmounts during the fetch. D: The `useMemo` hook for `filteredItems` is unnecessary and can be removed without impact. E: The component will fail to display items when the filter is cleared. F: There are no significant issues; the component is implemented optimally.
Medium Rhyme Reducer Reducer functions Immutable update patterns Lazy initialization	Try practice test
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
Hard State Handling with Custom Hooks Custom Hooks Context API Event Handling	Try practice test
Consider a React application where a custom hook `useComplexState` is defined to manage a complex state object. The application also uses the Context API to pass down the state and dispatch function. Below is the pseudo-code for the custom hook and a component using it: Given this setup, which of the following statements best describes the potential issue or challenge with `MyComponent`? A: The component will not re-render when the global state changes. B: The `fetchData` function will cause an infinite loop of re-renders. C: The component will lose its state when the global state updates. D: There will be a memory leak due to improper cleanup in `useEffect`. E: The `dispatch` function from `useComplexState` will conflict with the global dispatch. F: There is no issue; the component is implemented correctly.
Medium Async Await Promises Promises Async-Await	Try practice test
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
Medium Bitcoin prices Axios Promises	Try practice test
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	Try practice test
What will the output of the following JavaScript code be?
Medium Promise Resolve Promises Async-Await	Try practice test
What does the following code output?
Easy Throw, Try, Async Promises Async-Await	Try practice test
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 Debugging Redux Actions and Reducers JavaScript ES6 Reducers Actions	2 mins Redux	Try practice test
A developer is working with a Redux application for managing todo items. After some changes to the code, they started facing a problem: When they try to add a new todo item, it doesn't appear on the list. However, deleting a todo item works as expected. Here is the error message they see in the console when trying to add a todo: `Cannot read property 'undefined' of undefined.` And here is the relevant Redux code: Which of the following changes will resolve the issue? A: Change payload to todo in addTodo action creator. B: Change action.todo to action.payload in todoReducer for ADD_TODO case. C: Change action.todo to action.payload in todoReducer for ADD_TODO case and change action.index to action.payload for DELETE_TODO case. D: Change payload to todo in addTodo action creator and index to payload in deleteTodo action creator.
	Medium Debugging Redux with Complex State and Action JavaScript ES6 Reducers Actions Immutability Object manipulation	2 mins Redux	Try practice test
A developer is working on a Redux application where each action carries an array of items, and each item is an object with an `id` and `value`. The state is an object where each key is an item's `id` and each value is the item's `value`. However, they notice that the `ADD_ITEMS` action isn't updating the state as expected. Here is the relevant Redux code: What change should the developer make to correct the issue?
	Medium Direct State Mutation in Redux JavaScript ES6 Reducers Actions Mutations	3 mins Redux	Try practice test
A developer is creating a Redux application to manage a list of blog posts. Each post is represented by an object with id, title, and content properties. The Redux state should store the post list as an array. The developer observes that the modifications to the posts are not reflecting in the components. Here is an example of what the state could look like: Here is the relevant Redux code: Which of the following changes will resolve the issue?
	Hard Context re-renders React Context API Conditional Rendering Component Lifecycle State	3 mins React	Try practice test
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 Hooks with Conditional Rendering Hooks Conditional Rendering Event Handling	3 mins React	Try practice test
Consider a React functional component that utilizes various hooks and conditional rendering. The component is designed to fetch and display a list of items from an API, with the ability to filter the list based on user input. Here's the pseudo-code structure: In this component, which of the following is a potential issue or inefficiency? A: The component will re-render excessively due to the `setFilter` call. B: The `useEffect` hook will run on every render, causing performance issues. C: The `fetchItems` function may cause a memory leak if the component unmounts during the fetch. D: The `useMemo` hook for `filteredItems` is unnecessary and can be removed without impact. E: The component will fail to display items when the filter is cleared. F: There are no significant issues; the component is implemented optimally.
	Medium Rhyme Reducer Reducer functions Immutable update patterns Lazy initialization	3 mins React	Try practice test
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
	Hard State Handling with Custom Hooks Custom Hooks Context API Event Handling	3 mins React	Try practice test
Consider a React application where a custom hook `useComplexState` is defined to manage a complex state object. The application also uses the Context API to pass down the state and dispatch function. Below is the pseudo-code for the custom hook and a component using it: Given this setup, which of the following statements best describes the potential issue or challenge with `MyComponent`? A: The component will not re-render when the global state changes. B: The `fetchData` function will cause an infinite loop of re-renders. C: The component will lose its state when the global state updates. D: There will be a memory leak due to improper cleanup in `useEffect`. E: The `dispatch` function from `useComplexState` will conflict with the global dispatch. F: There is no issue; the component is implemented correctly.
	Medium Async Await Promises Promises Async-Await	2 mins JavaScript	Try practice test
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
	Medium Bitcoin prices Axios Promises	2 mins JavaScript	Try practice test
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	Try practice test
What will the output of the following JavaScript code be?
	Medium Promise Resolve Promises Async-Await	2 mins JavaScript	Try practice test
What does the following code output?
	Easy Throw, Try, Async Promises Async-Await	2 mins JavaScript	Try practice test
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
	Debugging Redux Actions and Reducers JavaScript ES6 Reducers Actions	Redux	Medium	2 mins	Try practice test
A developer is working with a Redux application for managing todo items. After some changes to the code, they started facing a problem: When they try to add a new todo item, it doesn't appear on the list. However, deleting a todo item works as expected. Here is the error message they see in the console when trying to add a todo: `Cannot read property 'undefined' of undefined.` And here is the relevant Redux code: Which of the following changes will resolve the issue? A: Change payload to todo in addTodo action creator. B: Change action.todo to action.payload in todoReducer for ADD_TODO case. C: Change action.todo to action.payload in todoReducer for ADD_TODO case and change action.index to action.payload for DELETE_TODO case. D: Change payload to todo in addTodo action creator and index to payload in deleteTodo action creator.
	Debugging Redux with Complex State and Action JavaScript ES6 Reducers Actions Immutability Object manipulation	Redux	Medium	2 mins	Try practice test
A developer is working on a Redux application where each action carries an array of items, and each item is an object with an `id` and `value`. The state is an object where each key is an item's `id` and each value is the item's `value`. However, they notice that the `ADD_ITEMS` action isn't updating the state as expected. Here is the relevant Redux code: What change should the developer make to correct the issue?
	Direct State Mutation in Redux JavaScript ES6 Reducers Actions Mutations	Redux	Medium	3 mins	Try practice test
A developer is creating a Redux application to manage a list of blog posts. Each post is represented by an object with id, title, and content properties. The Redux state should store the post list as an array. The developer observes that the modifications to the posts are not reflecting in the components. Here is an example of what the state could look like: Here is the relevant Redux code: Which of the following changes will resolve the issue?
	Context re-renders React Context API Conditional Rendering Component Lifecycle State	React	Hard	3 mins	Try practice test
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
	Hooks with Conditional Rendering Hooks Conditional Rendering Event Handling	React	Medium	3 mins	Try practice test
Consider a React functional component that utilizes various hooks and conditional rendering. The component is designed to fetch and display a list of items from an API, with the ability to filter the list based on user input. Here's the pseudo-code structure: In this component, which of the following is a potential issue or inefficiency? A: The component will re-render excessively due to the `setFilter` call. B: The `useEffect` hook will run on every render, causing performance issues. C: The `fetchItems` function may cause a memory leak if the component unmounts during the fetch. D: The `useMemo` hook for `filteredItems` is unnecessary and can be removed without impact. E: The component will fail to display items when the filter is cleared. F: There are no significant issues; the component is implemented optimally.
	Rhyme Reducer Reducer functions Immutable update patterns Lazy initialization	React	Medium	3 mins	Try practice test
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
	State Handling with Custom Hooks Custom Hooks Context API Event Handling	React	Hard	3 mins	Try practice test
Consider a React application where a custom hook `useComplexState` is defined to manage a complex state object. The application also uses the Context API to pass down the state and dispatch function. Below is the pseudo-code for the custom hook and a component using it: Given this setup, which of the following statements best describes the potential issue or challenge with `MyComponent`? A: The component will not re-render when the global state changes. B: The `fetchData` function will cause an infinite loop of re-renders. C: The component will lose its state when the global state updates. D: There will be a memory leak due to improper cleanup in `useEffect`. E: The `dispatch` function from `useComplexState` will conflict with the global dispatch. F: There is no issue; the component is implemented correctly.
	Async Await Promises Promises Async-Await	JavaScript	Medium	2 mins	Try practice test
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	Medium	2 mins	Try practice test
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	Try practice test
What will the output of the following JavaScript code be?
	Promise Resolve Promises Async-Await	JavaScript	Medium	2 mins	Try practice test
What does the following code output?
	Throw, Try, Async Promises Async-Await	JavaScript	Easy	2 mins	Try practice test
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

Avec Adaface, nous avons pu optimiser notre processus de sélection initiale de plus de 75 %, libérant ainsi un temps précieux tant pour les responsables du recrutement que pour notre équipe d'acquisition de talents !

Brandon Lee, Chef du personnel, Love, Bonito

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Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Test React & Redux en ligne 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.

Science behind Adaface tests

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Test React & Redux en ligne 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

Voir l'échantillon

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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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Preview this test

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About the React & Redux Assessment Test

Why you should use Pre-employment React & Redux Online Test?

The Test React & Redux en ligne makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Comprendre la syntaxe et les fonctions de base de JavaScript.
L'application des fonctionnalités JavaScript ES6 telles que les fonctions de flèche, les littéraux de modèle et les affectations destructuration.
Travailler avec JavaScript asynchrone, y compris les promesses et Async / Await.
Mise en œuvre des fondamentaux React comme les composants, les accessoires et la gestion de l'État.
Utilisation des crochets React pour la gestion de l'état des composants fonctionnels.
Comprendre le cycle de vie des composants React et utiliser des méthodes de cycle de vie.
Gérer l'État mondial à l'aide de Redux State Management.
Gestion des demandes d'API asynchrones à l'aide de redux.
Création d'actions Redux et de sélecteurs pour une gestion efficace de l'État.
Implémentation de solutions de codage JavaScript pour divers problèmes.

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the React & Redux Online Test?

Syntaxe JavaScript
La syntaxe JavaScript fait référence à l'ensemble des règles qui dictent comment le code JavaScript doit être écrit et structuré. Il comprend des concepts tels que des variables, des fonctions, des conditions, des boucles et des opérateurs. Cette compétence est importante à mesurer dans le test car elle forme la base de la programmation JavaScript et est cruciale pour tout développeur travaillant avec React et Redux.
javascript es6
javascript es6, également connu En tant qu'ECMAScript 2015, a introduit plusieurs nouvelles fonctionnalités et améliorations dans la langue JavaScript. Il inclut les fonctions de flèche, les variables const et locaux, littéraux de modèle, etc. L'évaluation de cette compétence dans le test aide à déterminer la familiarité d'un candidat avec la syntaxe JavaScript moderne et sa capacité à écrire du code concis et efficace.
javascript asynchrone
d'un autre code. Il implique généralement des rappels, des promesses et une syntaxe asynchronisée / attendre pour gérer les tâches telles que les demandes de réseau ou les opérations de fichiers. Cette compétence est importante à mesurer car React et Redux nécessitent souvent de travailler avec des opérations asynchrones, telles que la récupération des données des API.
React Fundamentals
React Fundamentals couvrent les concepts et principes principaux des Bibliothèque React. Cela comprend l'apprentissage des composants, des accessoires, de l'état, des méthodes de cycle de vie, de la syntaxe JSX et des événements de manipulation. La mesure de cette compétence aide à évaluer les connaissances et la compréhension d'un candidat des éléments constitutifs de React et de sa capacité à créer des composants d'interface utilisateur réutilisables et efficaces.
REACT HOCKS
REACT Les crochets sont un ensemble de fonctions introduites dans React 16.8 qui permet aux développeurs d'utiliser l'état et d'autres fonctionnalités de réaction sans rédaction de composants de classe. Avec les crochets, les composants fonctionnels peuvent avoir leur propre état, les méthodes de cycle de vie et d'autres fonctionnalités. Cette compétence est importante à mesurer car les crochets sont devenus le moyen d'écrire des composants de réaction préférés et les comprendre est essentiel pour le développement moderne de la réaction.
Le cycle de vie des composants réagis
Le cycle de vie React Component fait référence au Les différentes phases qu'un composant React traverse de sa création à son retrait du DOM. Il comprend des méthodes telles que ComponentDidMount, ComponentDiDupdate et ComponentWilLunMount. L'évaluation de cette compétence aide à évaluer la compréhension d'un candidat des méthodes de cycle de vie des composants et de leur capacité à les utiliser efficacement pour des tâches telles que les opérations de récupération ou de nettoyage des données.
Redux State Management
Redux est une gestion de l'État Bibliothèque pour les applications JavaScript, souvent utilisées en conjonction avec React. Il fournit un conteneur d'état prévisible et permet une gestion centralisée de l'état d'application. La mesure de cette compétence dans le test permet aux recruteurs d'évaluer la maîtrise d'un candidat en utilisant Redux pour gérer l'état complexe et gérer le flux de données dans une application React.
Gestion de l'API Redux
La manipulation de l'API Redux implique une Écrire des actions, des réducteurs et du middleware pour gérer les opérations asynchrones, telles que la création de demandes d'API dans une application Redux. Il comprend des concepts comme Thunk Middleware, la gestion des états de chargement et d'erreur et la mise à jour du magasin Redux avec des données récupérées. L'évaluation de cette compétence aide à déterminer la capacité d'un candidat à intégrer Redux avec les API et à gérer efficacement les flux de travail asynchrones.
Les actions et sélecteurs de Redux
redux sont des objets JavaScript simples qui représentent des événements uniques qui peuvent se produire dans une application. Les sélecteurs sont des fonctions utilisées pour extraire et dériver des données spécifiques du magasin Redux. L'évaluation de cette compétence aide à évaluer la compréhension et la mise en œuvre des actions Redux par un candidat pour les mises à jour et les sélecteurs pour une récupération efficace des données dans une application basée sur Redux.
codage JavaScript
Le codage JavaScript fait référence au Capacité à écrire du code propre, efficace et maintenable à l'aide de JavaScript. Il englobe des concepts comme la résolution de problèmes algorithmiques, la manipulation des données et l'application des meilleures pratiques. La mesure de cette compétence dans le test aide à déterminer la maîtrise globale de JavaScript d'un candidat et sa capacité à écrire du code de qualité lorsque vous travaillez avec React et Redux.
Full list of covered topics
The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Test React & Redux en ligne to be based on.
Syntaxe JavaScript
Javascript es6
JS asynchrone
React Fundamentals
Réagir des crochets
Cycle de vie des composants react
Gestion de l'État redux
Manipulation de l'API Redux
Actions et sélecteurs Redux
Codage javascript
Les fonctions
Variables
Types de données
Les opérateurs
Flux de contrôle
Tableaux
Objets
Des classes
Promesses
Asynchrone / attendre
Fermetures
Boucle d'événement
JSX
Composants
Accessoires
État
Méthodes de cycle de vie
Crochets
API de contexte
Composants d'ordre supérieur
Gestion de l'État
Réducteurs
Créateurs d'action
Magasin Redux
Middleware
Faire vibrer
Axios
Intégration API
Sélecteurs
Données immuables
Tester avec une plaisanterie
Débogage
La gestion des erreurs
Manipulation de Dom
Gestion des événements
Ajax
API récupérer
Destructeur
Répartir la syntaxe
Fonctions flèches
Modèle littéraux
Paramètres de repos
Paramètres par défaut
Modules
Importer / Exporter
Des classes
Héritage
Prototypes
Tableaux
Méthodes de tableau
Itération
Carte
Ensemble
Promesses
Générateurs

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What roles can I use the React & Redux Online Test for?

Développeur frontal
Développeur réagi
Développeur redux
Développeur de redux senior

How is the React & Redux Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Construire des applications de réaction évolutives et maintenables.
Optimisation des performances dans les applications React.
Implémentation de division de code et de chargement paresseux dans les applications React.
Utilisation du routeur React pour le routage côté client dans les applications React.
Intégration des bibliothèques et des cadres tiers avec des applications React.
Test des composants React à l'aide de bibliothèques comme la plaisanterie et l'enzyme.
Implémentation de rendu côté serveur (SSR) dans les applications React.
Sécuriser les applications REACT en mettant en œuvre l'authentification et l'autorisation.
Implémentation de la mise en cache des données et de la persistance dans les applications React.
Analyser et résoudre les problèmes de performances dans les applications React et Redux.
Conception et implémentation de l'architecture Redux évolutive pour de grandes applications.

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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Les responsables du recrutement ont estimé que grâce aux questions techniques qu'ils ont posées lors des entretiens avec le panel, ils étaient en mesure de déterminer quels candidats avaient obtenu de meilleurs scores et de se différencier de ceux qui avaient obtenu de moins bons résultats. Ils sont très satisfait avec la qualité des candidats présélectionnés lors de la sélection Adaface.

85%

réduction du temps de dépistage

Voir l'étude de cas complète

React & Redux Hiring Test FAQ

Puis-je combiner plusieurs compétences en une seule évaluation personnalisée?

Oui absolument. Les évaluations personnalisées sont configurées en fonction de votre description de poste et comprendront des questions sur toutes les compétences indispensables que vous spécifiez.

Avez-vous en place des fonctionnalités anti-chétion ou de proctorisation?

Nous avons les fonctionnalités anti-modification suivantes en place:

Questions non googléables
IP Proctoring
Proctoring Web
Proctoring webcam
Détection du plagiat
navigateur sécurisé

En savoir plus sur les fonctionnalités de Proctoring.

Comment interpréter les résultats des tests?

La principale chose à garder à l'esprit est qu'une évaluation est un outil d'élimination, pas un outil de sélection. Une évaluation des compétences est optimisée pour vous aider à éliminer les candidats qui ne sont pas techniquement qualifiés pour le rôle, il n'est pas optimisé pour vous aider à trouver le meilleur candidat pour le rôle. Ainsi, la façon idéale d'utiliser une évaluation consiste à décider d'un score de seuil (généralement 55%, nous vous aidons à bencher) et à inviter tous les candidats qui marquent au-dessus du seuil pour les prochains cycles d'entrevue.

Pour quel niveau d'expérience puis-je utiliser ce test?

Chaque évaluation ADAFACE est personnalisée à votre description de poste / Persona de candidats idéaux (nos experts en la matière choisiront les bonnes questions pour votre évaluation de notre bibliothèque de 10000+ questions). Cette évaluation peut être personnalisée pour tout niveau d'expérience.

Chaque candidat reçoit-il les mêmes questions?

Oui, cela vous permet de comparer les candidats. Les options pour les questions du MCQ et l'ordre des questions sont randomisées. Nous avons Anti-Cheating / Proctoring en place. Dans notre plan d'entreprise, nous avons également la possibilité de créer plusieurs versions de la même évaluation avec des questions de niveaux de difficulté similaires.

Je suis candidat. Puis-je essayer un test de pratique?

Non. Malheureusement, nous ne soutenons pas les tests de pratique pour le moment. Cependant, vous pouvez utiliser nos exemples de questions pour la pratique.