Node.js Online Test

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About the test

The Node.js online test assesses knowledge of programming in JavaScript and the ability to solve asynchronous problems through a series of live coding tasks that are executed in the Node.js environment.

The assessment includes work-sample tasks such as:

  • Working with the Promise object and the Async-Await programming pattern.
  • Coding without blocking the Event Loop.
  • Using modules to organize code.

A good Node.js developer needs a solid understanding of JavaScript and Node.js environment in order to solve asynchronous problems on the back end.

Sample public questions

Hard
10 min
code
Public
Node.js
Async-Await
Asynchronous Calls
Promise

A company uses a Node.js application that checks several data sources for requested information. Since each request to a data source is performance heavy, the application should try to check the next source only if the request failed at the current data source. That functionality was extracted into the firstSuccessfulPromise function.

The firstSuccessfulPromise function accepts an array of Promises as a promiseArray parameter. The function should return a Promise which should resolve to the first successful result from the promiseArray.

If no Promise from the promiseArray returns successfully, the function should return undefined.

For example, if the following code is executed:

firstSuccessfulPromise([new Promise((resolve, reject) => reject()), 
              new Promise((resolve, reject) => resolve("Success!"))])
  .then(result => console.log(result));

It should print "Success!".

Easy
15 min
code
Public
Node.js
Asynchronous Programming
Promise

Implement the getInParallel function that should be used to invoke multiple API calls in parallel. The function accepts an array of functions that return a Promise. The function should return a Promise which should resolve to an array of results from the apiCalls argument.

For example, calling the following code should print "[ 'First API call!', 'Second API call!' ]":

let promise = getInParallel([() => Promise.resolve("First API call!"),
                             () => Promise.resolve("Second API call!")]);
if(promise) {
  promise.then((result) => console.log(result)).catch((err) => console.log(err));
}

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12 more premium Node.js questions

Shopping Cart, Weather Data, File Exists, Run Sequentially, Retry Request, Stream Transform, Package Declaration, Add Id, Hash Bug, Game Action, Arrange Promises, Fahrenheit Converter.

Skills and topics tested

  • Node.js
  • Events
  • Asynchronous Programming
  • Modules
  • Async-Await
  • Promise
  • JSON
  • Stream
  • NPM
  • Event Loop
  • Bug Fixing
  • Event Emitter
  • Exceptions

For job roles

  • Node.js Developer

Sample candidate report

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Simple, straight-forward technical testing

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Capterra - 4.5 Stars
Capterra - Shortlist (2023)

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