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

30 min
2D Array

A turn-based strategy game has a grid with water and land. The grid contains a true value where it's water and false where it's land.

The player controls a boat unit with a particular movement pattern. It can only move to fixed destinations from its current position as shown in the image below:

movement pattern

The boat can only move in a direct path through water to the possible destinations, so a destination will become unreachable if there is land in the way. 

Implement the canTravelTo function, that checks whether a destination is reachable by the boat. It should return true for destinations that are reachable according to the pattern above, and false for unreachable or out of bounds destinations which are outside the grid. 

For example, consider the following code:

const gameMatrix = [
  [false, true,  true,  false, false, false],
  [true,  true,  true,  false, false, false],
  [true,  true,  true,  true,  true,  true],
  [false, true,  true,  false, true,  true],
  [false, true,  true,  true,  false, true],
  [false, false, false, false, false, false],

console.log(canTravelTo(gameMatrix, 3, 2, 2, 2)); // true, Valid move
console.log(canTravelTo(gameMatrix, 3, 2, 3, 4)); // false, Can't travel through land
console.log(canTravelTo(gameMatrix, 3, 2, 6, 2)); // false, Out of bounds

The following image shows valid and invalid destinations when the boat is in the position (3, 2):

terrain movement

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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20 more premium TypeScript questions

Garden Plants, Open Interface, Person, Height, Taxable Book, Album, Shipping, Flimsy Ladder, Filter, Planet Search, Digital Flasks, Calories Burned, Chemical Machine, First Not Null, Item Price, Construction Game, Construction Game, Company Stock, Airport Networks, Circuit Simulator.

Skills and topics tested

  • TypeScript
  • OOP
  • Spread
  • Arithmetic
  • Language
  • Objects
  • Inheritance
  • Arrays
  • Iteration
  • Conditions
  • Union Types
  • Field Accessor
  • AI Code Review
  • Conditional Statements
  • 2D Array
  • Graphs

For job roles

  • TypeScript Developer

Sample candidate report

What others say

Decorative quote

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

G2 - Crowd Badge
G2 - High Performer (2022)
Capterra - 4.5 Stars
Capterra - Shortlist (2023)

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