TypeScript Online Test

The TypeScript test uses scenario-based MCQ questions and code-tracing questions to evaluate a candidate's understanding of Typescript concepts like Types, ES6 Support, OOP (Classes, Modules, Interfaces) and their ability to write asynchronous code with async/await. Along with TypeScript, the test has MCQ questions to evaluate JavaScript fundamentals and coding questions to evaluate hands-on coding skills.

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Screen candidates with a 45 mins test

Test duration: 45 mins

Difficulty level: Moderate

Availability: Ready to use

Questions:

5 JavaScript MCQs
5 TypeScript MCQs
1 JavaScript Coding Question

Covered skills:

JavaScript fundamentals

Understanding of DOM and web scripting

Typescript basics (Types; ES6)

Creating objects using classes

Reusing Objects through Inheritance

Using different access modifiers

Encapsulating classes/objects

Asynchronous development with Async/Await

Usage of TypeScript with webpack

Exception handling

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The TypeScript 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:

Understanding and usage of basic JavaScript syntax and functions
Knowledge of the DOM and ability to manipulate web elements
Typescript fundamentals, including understanding types and ES6 features
Creation of objects using classes
Understanding and implementation of inheritance
Ability to use different access modifiers
Knowledge of encapsulation of classes and objects
Proficiency in asynchronous development with Async/Await
Experience using TypeScript with webpack
Efficient handling of exceptions and errors

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How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this TypeScript Online Test will be non-googleable.

🧐 Question
Medium Alias OOPs	Solve
What does the following TypeScript code print?
Medium Truthiness Narrowing	Solve
We wrote the following TypeScript function to work as global print function. The function needs to handle string input, an array of strings as input or null as an input. In case of string and array of strings, it needs to print them to console. For null input, the code should not print anything. The function is throwing an error when it is called with null - globalConsole(null). This is happening because typeof null is ‘object’ in JavaScript. Here are two modifications of the code to handle this case: Pick the correct statements: A: In the case of null input, globalConsole1 won’t produce any compiler errors like globalConsole B: In the case of null input, globalConsole2 won’t produce any compiler errors like globalConsole C: globalConsole1 will differ from globalConsole for an empty string D: globalConsole2 will differ from globalConsole for an empty string
Hard Types	Solve
Consider the following TypeScript code: Which of the following statements are correct: A: The typescript compiler confirms that toUpperCase exists on the a instance. B: The typescript compiler states that the toUpperCase function does not exist on the b instance. C: The typescript compiler confirms that the toUpperCase function exists on the b instance. D: RectangleType is an array where the type of a fixed number of elements is known. E: Variables r, g, b are immutable. F: r, g, b would compile to same type signature
Medium Async Await Promises Promises Async-Await	Solve
What will the following code output? 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	Solve
Review the following JavaScript code and pick the correct options: 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	Solve
What will the output of the following JavaScript code be?
Medium Promise Resolve Promises Async-Await	Solve
What does the following code output?
Easy Throw, Try, Async Promises Async-Await	Solve
What does the following JS code output?
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 Alias OOPs	2 mins TypeScript	Solve
What does the following TypeScript code print?
	Medium Truthiness Narrowing	3 mins TypeScript	Solve
We wrote the following TypeScript function to work as global print function. The function needs to handle string input, an array of strings as input or null as an input. In case of string and array of strings, it needs to print them to console. For null input, the code should not print anything. The function is throwing an error when it is called with null - globalConsole(null). This is happening because typeof null is ‘object’ in JavaScript. Here are two modifications of the code to handle this case: Pick the correct statements: A: In the case of null input, globalConsole1 won’t produce any compiler errors like globalConsole B: In the case of null input, globalConsole2 won’t produce any compiler errors like globalConsole C: globalConsole1 will differ from globalConsole for an empty string D: globalConsole2 will differ from globalConsole for an empty string
	Hard Types	2 mins TypeScript	Solve
Consider the following TypeScript code: Which of the following statements are correct: A: The typescript compiler confirms that toUpperCase exists on the a instance. B: The typescript compiler states that the toUpperCase function does not exist on the b instance. C: The typescript compiler confirms that the toUpperCase function exists on the b instance. D: RectangleType is an array where the type of a fixed number of elements is known. E: Variables r, g, b are immutable. F: r, g, b would compile to same type signature
	Medium Async Await Promises Promises Async-Await	2 mins JavaScript	Solve
What will the following code output? 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	2 mins JavaScript	Solve
Review the following JavaScript code and pick the correct options: 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	2 mins JavaScript	Solve
What will the output of the following JavaScript code be?
	Medium Promise Resolve Promises Async-Await	2 mins JavaScript	Solve
What does the following code output?
	Easy Throw, Try, Async Promises Async-Await	2 mins JavaScript	Solve
What does the following JS code output?
	Easy Registration Queue Logic Queues	30 mins Coding	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	30 mins Coding	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	💪 Difficulty	⌛ Time
	Alias OOPs	TypeScript	Medium	2 mins	Solve
What does the following TypeScript code print?
	Truthiness Narrowing	TypeScript	Medium	3 mins	Solve
We wrote the following TypeScript function to work as global print function. The function needs to handle string input, an array of strings as input or null as an input. In case of string and array of strings, it needs to print them to console. For null input, the code should not print anything. The function is throwing an error when it is called with null - globalConsole(null). This is happening because typeof null is ‘object’ in JavaScript. Here are two modifications of the code to handle this case: Pick the correct statements: A: In the case of null input, globalConsole1 won’t produce any compiler errors like globalConsole B: In the case of null input, globalConsole2 won’t produce any compiler errors like globalConsole C: globalConsole1 will differ from globalConsole for an empty string D: globalConsole2 will differ from globalConsole for an empty string
	Types	TypeScript	Hard	2 mins	Solve
Consider the following TypeScript code: Which of the following statements are correct: A: The typescript compiler confirms that toUpperCase exists on the a instance. B: The typescript compiler states that the toUpperCase function does not exist on the b instance. C: The typescript compiler confirms that the toUpperCase function exists on the b instance. D: RectangleType is an array where the type of a fixed number of elements is known. E: Variables r, g, b are immutable. F: r, g, b would compile to same type signature
	Async Await Promises Promises Async-Await	JavaScript	Medium	2 mins	Solve
What will the following code output? 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
	Bitcoin prices Axios Promises	JavaScript	Medium	2 mins	Solve
Review the following JavaScript code and pick the correct options: 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?
	My Module Scope	JavaScript	Medium	2 mins	Solve
What will the output of the following JavaScript code be?
	Promise Resolve Promises Async-Await	JavaScript	Medium	2 mins	Solve
What does the following code output?
	Throw, Try, Async Promises Async-Await	JavaScript	Easy	2 mins	Solve
What does the following JS code output?
	Registration Queue Logic Queues	Coding	Easy	30 mins	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
	Visitors Count Strings Logic	Coding	Medium	30 mins	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.

Test candidates on core TypeScript Hiring Test topics

JavaScript fundamentals: JavaScript fundamentals refer to the core concepts and principles of the JavaScript programming language. This includes understanding variables, data types, control flow, loops, functions, and more. Assessing this skill is important as it forms the foundation for working with TypeScript and building web applications.

Understanding of DOM and web scripting: An understanding of the Document Object Model (DOM) and web scripting involves knowing how to manipulate HTML elements and interact with web pages dynamically using JavaScript. This is crucial for developing interactive and responsive web applications. Testing this skill helps evaluate the candidate's ability to work with the DOM and perform web scripting tasks.

Typescript basics (Types; ES6): Typescript basics cover important concepts such as type annotations, type inference, and the use of ES6 features. Assessing this skill ensures that candidates have a solid understanding of TypeScript syntax and can leverage its features to write type-safe and modern JavaScript code.

Creating objects using classes: Creating objects using classes is an essential skill as it allows for code organization and the creation of reusable, structured objects in TypeScript. Evaluating this skill helps determine the candidate's proficiency in using classes to define and instantiate objects, enabling better code maintainability and extensibility.

Reusing Objects through Inheritance: Reusing objects through inheritance is a key aspect of object-oriented programming in TypeScript. This skill involves understanding how to derive new classes from existing ones and inherit their properties and methods. Testing this skill ensures that candidates can effectively utilize inheritance to achieve code reuse and promote modular design.

Using different access modifiers: Using different access modifiers, such as public, private, and protected, allows for controlling the visibility and access of class members. Assessing this skill helps evaluate the candidate's ability to implement encapsulation and enforce proper data hiding and abstraction in TypeScript code.

Encapsulating classes/objects: Encapsulating classes/objects involves the practice of bundling data and methods within a class, providing a level of encapsulation and protecting the internals from external interference. This skill evaluation ensures candidates can effectively encapsulate and create well-organized, modular code in TypeScript.

Asynchronous development with Async/Await: Asynchronous development with Async/Await involves writing code that can handle asynchronous operations and manage promises in a more readable and maintainable manner. Testing this skill helps assess the candidate's ability to write asynchronous code using Async/Await syntax, allowing for better handling of operations like API calls, file reading/writing, and more.

Usage of TypeScript with webpack: Usage of TypeScript with webpack refers to the ability to integrate TypeScript into a webpack-based development workflow. This includes setting up TypeScript configuration, managing module bundling, and leveraging webpack features like code splitting and dynamic imports. Evaluating this skill verifies the candidate's proficiency in using TypeScript with webpack for optimized and efficient development.

Exception handling: Exception handling is the practice of catching and handling errors or exceptions that occur during the execution of a program. Assessing this skill helps determine the candidate's ability to handle errors gracefully and implement proper error handling mechanisms in TypeScript, ensuring more robust and reliable code.

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