TypeScript Online Test

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About the test

The TypeScript online test assesses knowledge of programming in the TypeScript language through a series of live coding tasks.

The assessment includes work-sample tasks such as:

  • Applying OOP principles in TypeScript to write reusable code.
  • Using Mixins to build classes from reusable components.
  • Modifying arrays and strings using common built-in functions.

A good TypeScript developer needs a solid understanding of the TypeScript programming language and know how to effectively use its type system.

Sample public questions

20 min

Your company is analyzing malware which targets numerical record files.

The malware uses a sliding window over the array of numbers in a file, and tries to match the following pattern:

T, -, -, X, -, -, -, T

Where the position ‘X' is compared to each position 'T'. The window is moved so 'X’ passes through all the values.

The malware has the following rules:

  • If any of the ‘T' positions in the pattern are bigger or equal to 'X’ the malware replaces 'X' with 0.
  • If the 'X' position in the pattern is near the left or right border and is missing a 'T' position neighbor, only the other side is considered.
  • The malware finds all the positions first and only then sets them to 0.

For example, if the values in a record file are the following:

[1, 2, 0, 5, 0, 2, 4, 3, 3, 3]

The expected values after the malware runs are:

[1, 0, 0, 5, 0, 0, 0, 3, 3, 0]

In this example, number 4 was set to 0 because 5 is the bigger number.

Implement the simulate function so that the malware behavior is replicated for further study.

7 min

The Circle class is used in a prototype for a game engine. Finish the class so that:

  • It inherits from the GameObject class
  • It has one more public field, radius
  • It has only one constructor, that sets the radius, and sets the x and y fields using the GameObject class

For example, executing the following code:

let circle = new Circle(10, 50, 8);
console.log(circle.x, circle.y, circle.radius);

should print "10 50 8".

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14 more premium TypeScript questions

Garden Plants, Open Interface, Person, Height, Taxable Book, Album, First Not Null, Filter, Item Price, Construction Game, Flimsy Ladder, Calories Burned, Chemical Machine, Circuit Simulator.

Skills and topics tested

  • TypeScript
  • OOP
  • Spread
  • Arithmetic
  • Language
  • Objects
  • Inheritance
  • Union Types
  • Arrays
  • Field Accessor
  • Iteration
  • Conditions

For job roles

  • TypeScript 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.

Jan Opperman, Grindrod Bank

Product reviews

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Capterra - 4.5 Stars
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