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JavaScript, HTML/CSS & React Online Test

About the test:

JavaScript, HTML/CSS & React Test bruger scenariebaserede MCQ'er til at evaluere kandidater om deres færdigheder i JavaScript-programmeringssprog, HTML/CSS-markering og React Library. Testen vurderer kandidaternes forståelse af emner som DOM -manipulation, begivenhedshåndtering, komponentlivscyklus, statsstyring, rekvisitter og gengivelse og CSS -styling. Kandidater evalueres efter deres evne til at bruge disse teknologier til at løse problemer i den virkelige verden og udvikle responsive og interaktive webapplikationer.

Covered skills:

  • JavaScript Basics
  • JS oops
  • Asynkron node.js og løfter
  • React Component Lifecycle
  • CSS Box Model
  • Responsiv CSS
  • JS ES6
  • Håndtering af API'er
  • Bygningskomponenter med JSX
  • React Hooks og funktionelle komponenter
  • Flexbox og gitterlayouts
  • JavaScript -programmering

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9 reasons why
9 reasons why

Adaface JavaScript, HTML/CSS & React Test is the most accurate way to shortlist Fuld stakudviklers



Reason #1

Tests for on-the-job skills

The JavaScript, HTML/CSS & React 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:

  • Evne til effektivt at håndtere undtagelser og fejl
  • Færdighed i ES6 -syntaks og koncepter
  • Forståelse af objektorienterede programmeringsprincipper i JavaScript
  • Kendskab til arbejde med API'er og håndtering af asynkrone operationer
  • Erfaring med at bygge komponenter med JSX
  • Fortrolighed med react -komponentens livscyklus
  • Kendskab til at bruge React Hooks og funktionelle komponenter
  • Forståelse af CSS Box -model og dens anvendelse
  • Færdighed i at skabe responsive CSS -design
  • Stærke JavaScript -programmeringsevner
Reason #2

No trick questions

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

Dette er kun en lille prøve fra vores bibliotek med 10.000+ spørgsmål. De faktiske spørgsmål om dette JavaScript, HTML/CSS & React Test vil være ikke-gåbart.

🧐 Question

Medium

Async Await Promises
Promises
Async-Await
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What will the following code output?
 image
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
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Review the following JavaScript code and pick the correct options: 
 image
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
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What will the output of the following JavaScript code be?
 image
 image

Medium

Promise Resolve
Promises
Async-Await
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What does the following code output? 
 image

Easy

Throw, Try, Async
Promises
Async-Await
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What does the following JS code output?
 image

Easy

Background Properties
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Consider the following shorthand CSS example:

background: #f7f7f7 url(jolie.jpg) no-repeat scroll 0px 0px;

Which of the following show the individual background properties represented by the shorthand:
 image

Easy

Colorful sentences
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Our intern is writing a colorful blog post, and has written the following code. What colors will the sentences be?
 image
A: Sentence 1 will be gray, Sentence 2 will be pink.
B: Both sentences will be gray.
C: Sentence 1 will be pink, Sentence 2 will be gray.
D: Both sentences will be pink.
E: The code does not make sense; will throw an error.

Easy

Links
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In the following HTML, what will be the color of link with class "mark"
 image

Medium

Let's Hack
CSS Property
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Consider the following HTML and CSS:
 image
 image
Which additional CSS rule(s) will render the following image? Choose ALL that apply.
 image
A:
div{
  flex-direction : column;
  align-items : center;
}
B:
div{
  flex-direction : row;
  align-items: center;
}
C:
div{
  flex-direction: column;
  justify-content: center;
}
D:
div{
  flex-direction: row;
  justify-content: center;
}

Hard

Context re-renders
React Context API
Conditional Rendering
Component Lifecycle State
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Review the following React code:
 image
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
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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:
 image
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
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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
 image
 image

Hard

State Handling with Custom Hooks
Custom Hooks
Context API
Event Handling
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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:
 image
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.

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

Async Await Promises
Promises
Async-Await

2 mins

JavaScript
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Medium

Bitcoin prices
Axios
Promises

2 mins

JavaScript
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Medium

My Module
Scope

2 mins

JavaScript
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Medium

Promise Resolve
Promises
Async-Await

2 mins

JavaScript
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Easy

Throw, Try, Async
Promises
Async-Await

2 mins

JavaScript
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Easy

Background Properties

2 mins

HTML/CSS
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Easy

Colorful sentences

2 mins

HTML/CSS
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Easy

Links

2 mins

HTML/CSS
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Medium

Let's Hack
CSS Property

3 mins

HTML/CSS
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Hard

Context re-renders
React Context API
Conditional Rendering
Component Lifecycle State

3 mins

React
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Medium

Hooks with Conditional Rendering
Hooks
Conditional Rendering
Event Handling

3 mins

React
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Medium

Rhyme Reducer
Reducer functions
Immutable update patterns
Lazy initialization

3 mins

React
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Hard

State Handling with Custom Hooks
Custom Hooks
Context API
Event Handling

3 mins

React
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Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Async Await Promises
Promises
Async-Await
JavaScript
Medium2 mins
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Bitcoin prices
Axios
Promises
JavaScript
Medium2 mins
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My Module
Scope
JavaScript
Medium2 mins
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Promise Resolve
Promises
Async-Await
JavaScript
Medium2 mins
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Throw, Try, Async
Promises
Async-Await
JavaScript
Easy2 mins
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Background Properties
HTML/CSS
Easy2 mins
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Colorful sentences
HTML/CSS
Easy2 mins
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Links
HTML/CSS
Easy2 mins
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Let's Hack
CSS Property
HTML/CSS
Medium3 mins
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Context re-renders
React Context API
Conditional Rendering
Component Lifecycle State
React
Hard3 mins
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Hooks with Conditional Rendering
Hooks
Conditional Rendering
Event Handling
React
Medium3 mins
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Rhyme Reducer
Reducer functions
Immutable update patterns
Lazy initialization
React
Medium3 mins
Try practice test
State Handling with Custom Hooks
Custom Hooks
Context API
Event Handling
React
Hard3 mins
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Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

Med Adaface var vi i stand til at optimere vores indledende screeningsproces med op mod 75 %, hvilket frigjorde kostbar tid for både ansættelsesledere og vores talentanskaffelsesteam!


Brandon Lee, Leder af mennesker, Love, Bonito

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Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment JavaScript, HTML/CSS & React 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.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the JavaScript, HTML/CSS & React 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.

invite candidates
Reason #7

Detailed scorecards & benchmarks

Se prøvescorekort
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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.

test completion rate
Reason #9

Advanced Proctoring


Learn more

About the JavaScript, HTML/CSS & React Assessment Test

Why you should use Pre-employment JavaScript, HTML/CSS & React Online Test?

The JavaScript, HTML/CSS & React Test 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:

  • Forståelse af JavaScript -syntaks og grundlæggende elementer
  • Kendskab til ES6 -funktioner og brug
  • Evne til at skrive objektorienteret JavaScript-kode
  • Erfaring med at håndtere API'er og foretage HTTP -opkald
  • Færdighed i at arbejde med asynkron Node.js og løfter
  • Bygning af genanvendelige komponenter med JSX i React
  • Forståelse af reaktionskomponentens livscyklus
  • Ekspertise i at bruge React Hooks og funktionelle komponenter
  • Stærk forståelse af CSS Box -model
  • Evne til at skabe fleksible layouts ved hjælp af FlexBox og Grid

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 JavaScript, HTML/CSS & React Online Test?

  • javascript Basics

    javascript Basics henviser til den grundlæggende viden og forståelse af JavaScript -programmeringssproget. Det inkluderer koncepter som variabler, datatyper, operatører, konditioner, sløjfer, funktioner og grundlæggende syntaks. Denne færdighed måles i testen for at vurdere kandidatens grundlæggende viden om JavaScript, som er vigtig for enhver JavaScript -udviklerrolle.

  • JS ES6

    JS ES6 (ECMASCRIPT 2015) henviser til Seneste version af JavaScript -sproget. Det inkluderer nye funktioner og syntaksforbedringer, såsom pilfunktioner, klasser, moduler, skabelon -bogstaver, destruktion og spredt syntaks. Denne færdighed måles i testen for at evaluere kandidatens færdigheder i at bruge de moderne og mere effektive træk ved JavaScript.

  • JS oops

    JS oops (objektorienteret programmering) henviser til Paradigme af organisering og strukturering af kode ved hjælp af objekter og klasser. Det involverer begreber som indkapsling, arv og polymorfisme. Denne færdighed måles i testen for at vurdere kandidatens evne til at designe og implementere objektorienterede løsninger i JavaScript, som er vidt brugt i webudvikling.

  • Håndtering af API'er

    Håndtering af API'er involverer Evnen til at interagere med og forbruge applikationsprogrammeringsgrænseflader (API'er). Det inkluderer at foretage HTTP -anmodninger, analysere JSON -data, håndtere godkendelse og behandling af svar. Denne færdighed måles i testen for at evaluere kandidatens viden og praktiske erfaringer med at integrere webapplikationer med eksterne tjenester gennem API -interaktioner.

  • asynkron node.js og løfter

    asynkron node.js Henviser til muligheden for at skrive asynkron kode ved hjælp af Node.js, et JavaScript -runtime -miljø. Det involverer at bruge tilbagekald, løfter og async/afventer med at håndtere asynkrone operationer effektivt. Denne færdighed måles i testen for at vurdere kandidatens dygtighed i skrivning af ikke-blokerende og skalerbar JavaScript-kode i et Node.js-miljø.

  • Bygningskomponenter med JSX

    Bygningskomponenter med JSX involverer oprettelse af genanvendelige UI -komponenter ved hjælp af JSX -syntaks, som er en udvidelse til JavaScript, der ofte bruges i react -applikationer. Det inkluderer koncepter som komponentkomposition, rekvisitter og statsstyring. Denne færdighed måles i testen for at evaluere kandidatens evne til at udvikle modulære og genanvendelige UI -komponenter ved hjælp af JSX i forbindelse med JavaScript Faser og metoder involveret i livscyklussen for en reaktionskomponent, såsom montering, opdatering og afmontering. Det inkluderer metoder som ComponentDidMount, ComponentDidUpDate og ComponentWillunMount. Denne færdighed måles i testen for at vurdere kandidatens forståelse og praktiske viden om, hvordan reagekomponenter opfører og funktionelle komponenter henviser til den nye funktion, der er introduceret i React 16.8, der giver udviklere mulighed for at bruge tilstand og andre react -funktioner uden at skrive en klasse. Det involverer at bruge kroge som UseState, Useeffect, UseContext og UseRef. Denne færdighed måles i testen for at evaluere kandidatens færdigheder i at bruge kroge og funktionelle komponenter til at opbygge skalerbare og vedligeholdelige react -applikationer.

  • CSS Box Model

    CSS Box Model henviser til konceptet af hvordan elementer gengives og struktureres i CSS. Det inkluderer egenskaber som bredde, højde, polstring, margin og kant. Denne færdighed måles i testen for at vurdere kandidatens forståelse af, hvordan elementer er dimensioneret, placeret og fordelt i CSS, hvilket er afgørende for at skabe visuelt tiltalende og responsive weblayouts.

  • flexbox og gitterlayouts <////// H4> <p> flexbox og gitterlayouts er CSS -layoutmodeller, der giver fleksible og kraftfulde måder at arrangere elementer på en webside. FlexBox er et endimensionelt layout, mens gitteret er et to-dimensionelt layout. Denne færdighed måles i testen for at evaluere kandidatens evne til at skabe komplekse og responsive weblayouts ved hjælp af disse moderne CSS -layoutteknikker. </p> <h4> Responsive CSS

    Responsive CSS henviser til praksis med at skabe Websider, der kan tilpasse sig og justere til forskellige skærmstørrelser og enheder. Det involverer at bruge medieforespørgsler, fleksible enheder (såsom procenter og visningsenheder) og CSS -rammer som Bootstrap. Denne færdighed måles i testen for at vurdere kandidatens evne til at udvikle webapplikationer, der giver en problemfri og optimeret brugeroplevelse på tværs af forskellige enheder.

  • 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 JavaScript, HTML/CSS & React Test to be based on.

    Variabler
    Datatyper
    Aritmetiske operationer
    Betingede udsagn
    Loops
    Funktioner
    Arrays
    Genstande
    Fejlhåndtering
    Leksikalsk omfang
    Lukninger
    Hejset
    Prototyper
    Klasser
    Arv
    ES6 -moduler
    Pilfunktioner
    Destructuring
    Skabelon bogstaver
    Spredoperatør
    Hvileparametre
    Prislåsobjekt
    Async/venter
    Ajax
    Hent API
    JSON
    Dom manipulation
    Begivenhedshåndtering
    Browseropbevaring
    Reagerer komponenter
    JSX
    Rekvisitter
    Stat
    Livscyklusmetoder
    Reagere kroge
    Kontekst API
    Styling i React
    CSS -vælgere
    Boksmodel
    Flexbox
    Gitterlayout
    Medieforespørgsler
    Responsivt design
    Fejlfinding
    Enhedstest
    Kodeoptimering
    Algoritme -design
    Datakonstruktioner
    Fejlhåndtering
    Kodeanmeldelse
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What roles can I use the JavaScript, HTML/CSS & React Online Test for?

  • Fuld stakudvikler
  • JavaScript -udvikler
  • React Developer
  • Front-end Engineer

How is the JavaScript, HTML/CSS & React 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

  • Erfaring med at skabe responsive designs med CSS
  • Færdighed i JavaScript -programmering
  • Avanceret viden om JavaScript -rammer og biblioteker
  • Erfaring med front-end build-værktøjer som Webpack eller Babel
  • Evne til at optimere webpræstation og optimere gengivelse
  • Kendskab til statsstyringsbiblioteker såsom Redux eller Mobx
  • Erfaring med testrammer som Jest eller Enzym
  • Evne til at integrere med tredjeparts API'er og tjenester
  • Forståelse af versionskontrolsystemer som Git
  • Erfaring med fejlfinding og fejlfinding af komplekse problemer
  • Stærke problemløsningsevner og evne til at analysere krav

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

Singapore government logo

Ansættelseslederne mente, at de gennem de tekniske spørgsmål, som de stillede under panelinterviewene, var i stand til at fortælle, hvilke kandidater der havde bedre score og differentieret sig med dem, der ikke scorede så godt. De er meget tilfreds med kvaliteten af ​​de kandidater, der er nomineret med Adaface-screeningen.


85%
Reduktion i screeningstid

JavaScript, HTML/CSS & React Hiring Test Ofte stillede spørgsmål

Kan jeg kombinere flere færdigheder i en brugerdefineret vurdering?

Ja absolut. Brugerdefinerede vurderinger er oprettet baseret på din jobbeskrivelse og vil omfatte spørgsmål om alle must-have-færdigheder, du angiver.

Har du nogen anti-cheating eller proctoring-funktioner på plads?

Vi har følgende anti-cheating-funktioner på plads:

  • Ikke-gåbare spørgsmål
  • IP Proctoring
  • Webproctoring
  • Webcam Proctoring
  • Detektion af plagiering
  • Sikker browser

Læs mere om Proctoring Features.

Hvordan fortolker jeg testresultater?

Den primære ting at huske på er, at en vurdering er et elimineringsværktøj, ikke et udvælgelsesværktøj. En færdighedsvurdering er optimeret for at hjælpe dig med at eliminere kandidater, der ikke er teknisk kvalificerede til rollen, den er ikke optimeret til at hjælpe dig med at finde den bedste kandidat til rollen. Så den ideelle måde at bruge en vurdering på er at beslutte en tærskelværdi (typisk 55%, vi hjælper dig med benchmark) og inviterer alle kandidater, der scorer over tærsklen for de næste interviewrunder.

Hvilken oplevelsesniveau kan jeg bruge denne test til?

Hver Adaface -vurdering tilpasses til din jobbeskrivelse/ ideel kandidatperson (vores emneeksperter vælger de rigtige spørgsmål til din vurdering fra vores bibliotek på 10000+ spørgsmål). Denne vurdering kan tilpasses til ethvert erfaringsniveau.

Får hver kandidat de samme spørgsmål?

Ja, det gør det meget lettere for dig at sammenligne kandidater. Valgmuligheder for MCQ -spørgsmål og rækkefølgen af ​​spørgsmål randomiseres. Vi har anti-cheating/proctoring funktioner på plads. I vores virksomhedsplan har vi også muligheden for at oprette flere versioner af den samme vurdering med spørgsmål om lignende vanskelighedsniveauer.

Jeg er kandidat. Kan jeg prøve en øvelsestest?

Nej. Desværre understøtter vi ikke praksisforsøg i øjeblikket. Du kan dog bruge vores eksempler på spørgsmål til praksis.

Hvad er omkostningerne ved at bruge denne test?

Du kan tjekke vores prisplaner.

Kan jeg få en gratis prøve?

Ja, du kan tilmelde dig gratis og forhåndsvise denne test.

Jeg flyttede lige til en betalt plan. Hvordan kan jeg anmode om en brugerdefineret vurdering?

Her er en hurtig guide til hvordan man anmoder om en brugerdefineret vurdering på adaface.

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