RxJS Online Test

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About the test

The RxJS online test assesses knowledge of reactive programming concepts with RxJS and the various prebuilt operators that come with the library.

The assessment includes work-sample tasks such as:

  • Using RxJS Observables to manage asynchronously created data.
  • Working with RxJS Subjects for data broadcasting.
  • Processing streams of data with Pipeable Operators.

A good RxJS developer should be able to use reactive programming and the various prebuilt operators that come with the RxJS library to create maintainable and accessible web user interfaces.

Sample public questions

Easy
3 min
mca
Public
RxJS
Creation Operator
Pipeable Operator
RxJS Observable

An online streaming platform uses the following RxJS code to log the number of seconds passed in a video:

const seconds = interval(1000).pipe(
  map((x) => x + 1),
  startWith(0)
);

const logger = seconds.subscribe((x) =>
  console.log(`Seconds passed: ${x}`)
);

setTimeout(() => {
  logger.unsubscribe();
}, 5000);

What options will be true about seconds and logger after the code above is executed?

Easy
5 min
fill
Public
RxJS
RxJS Subject

Consider the following RxJS code for pushing and logging weather data:

const weatherSubject = new _______________({temperature: 0 , rainChance: 0});
const sendWeatherData = (weatherData) => {
  weatherSubject.____(weatherData);
};

sendWeatherData({temperature: 35.5 , rainChance: 20});
sendWeatherData({temperature: 34 , rainChance: 25});

weatherSubject.subscribe((x) => {
  console.log("Current Temperature: " +  x.temperature);
});

sendWeatherData({temperature: 28 , rainChance: 50});

weatherSubject.subscribe((x) => {
  console.log("Chance of rain: " + x.rainChance);
});

sendWeatherData({temperature: 25 , rainChance: 90});

Fill in the blanks above so that the following output is produced after running it:

Current Temperature: 34
Current Temperature: 28
Chance of rain: 50
Current Temperature: 25
Chance of rain: 90

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4 more premium RxJS questions

Dictionary Definition, Log Post Data, Awesome Tracking, Fresh Food.

Skills and topics tested

  • RxJS
  • Creation Operator
  • Pipeable Operator
  • RxJS Observable
  • Bug Fixing
  • RxJS Subject

For job roles

  • RxJS Developer

Sample candidate report

What others say

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Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

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