TypeScript is an intricate programming language that many professionals, including coders and software developers, use daily. Professionals interviewing for a position that requires the use of TypeScript may encounter questions from hiring managers that gauge their knowledge of this coding language. Understanding how to answer interview questions about this program can improve your chances of securing a position. In this article, we provide interview questions that a hiring manager may ask about TypeScript, explain why hiring managers may ask them, and offer sample answers you can reference when preparing for an interview.
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TypeScript interview questions with sample answers
Using TypeScript to develop applications often requires specialized training and professional experience. During an interview for a technology-based job, employers may ask questions about the fundamental attributes of this program so they can determine whether a candidate can complete their job duties effectively. Here are some TypeScript interview questions a hiring manager may ask along with sample answers to review:
1. What are the primitive types of TypeScript?
Hiring managers conducting interviews for certain technology-based positions may ask this question to determine a candidate’s familiarity with TypeScript. An effective answer to this question can also show that you understand how TypeScript relates to JavaScript. In your response, try to name the three primitive types and consider mentioning how they correspond to JavaScript’s primitive types.
Example: “The three primitive types of TypeScript are string, number, and boolean. These three types are similar to their JavaScript counterparts. For example, the string element can represent word-based values such as ‘typescript’ and ‘javascript.'”
2. What are the differences between JavaScript and TypeScript?
A candidate who understands TypeScript thoroughly often possesses some knowledge of JavaScript. TypeScript originates from JavaScript, and employers often seek candidates who understand their differences so that they can use both languages correctly. In your answer, try to state a few key differences between these two related programming languages.
Example: “One of the most apparent differences between these two languages is that JavaScript is a scripting language while TypeScript is an object-oriented language. TypeScript also has a static typing feature, and it offers support for parameter functions and models. JavaScript doesn’t feature any of these capabilities.”
3. What are some key benefits of TypeScript?
Individuals in the technology field often use several different programming languages to complete their daily tasks. Employers often want to ensure that candidates understand the unique benefits of TypeScript to use it optimally. In your response, consider listing at least two key benefits of TypeScript.
Example: “One of the main benefits of TypeScript is that it can operate on any JavaScript engine or browser. Another benefit of this programming language is that it uses the same semantics and syntax as JavaScript, meaning that back-end coders can help create front-end code quicker.”
4. What is TypeScript’s most current stable version, and what features of it do you like?
An interviewer may ask this question to gauge your familiarity with TypeScript’s current capabilities. A hiring manager may want to determine whether you seek to update your knowledge on the language and whether you have experience with current models. If you know the month and year that the new version became available, try to include that information in your response. Try to research before your interview so you have the most updated information.
Example: “The most current stable version of TypeScript is 4.5.2. I like the added improvements to the imports area of the language. It has improved upon the control we as developers have to import types and variables.”
5. What access modifiers does TypeScript support?
Access modifiers are important for arranging code and concealing specific implementation details that programmers can alter in the future. Employers often want to know whether you understand the different classes of access modifiers so that you can properly arrange code into classes and packages. In your answer, try to name the three access modifiers that TypeScript supports.
Example: “TypeScript supports three types of access modifiers: public, protected, and private. All class and child class members and the instance of each class can access public access modifiers. Class and child class members can access protected access modifiers. Only class members can access private access modifiers. If TypeScript doesn’t specify an access modifier, it’s inherently a public one.”
6. How do you debug a TypeScript file?
Employers are likely seeking candidates who can both write TypeScript code and debug existing files. If you can explain how to debug existing files, you can prove yourself to be a versatile candidate. In your answer, consider describing a simple process for debugging a TypeScript file.
Example: “Before I begin the debugging process, I start with a .js source map file. Then, I create a source map file by compiling the –sourcemap flag with the .ts file. This process generates a file1.js.map and file1.js. The file1.js is the source map file’s reference, and it’s this component that’s integral to the debugging process.”
7. What are Generics in TypeScript?
TypeScript contains multiple tools, and employers typically want to gauge whether candidates have familiarity with each tool. TypeScript Generics is a helpful utility that can improve efficiency. In your answer, try to define Generics and how it helps you as a developer or coder.
Example: “TypeScript Generics allows users to create recyclable coding elements. It also helps users write components that remain compatible with multiple types of data. I particularly enjoy using Generics because of the security it offers.”
8. What’s an important rule to follow when implementing rest parameters?
Rest parameters are cues that allow a function to accept unlimited arguments. They occur frequently in code, so an employer may inquire whether you know how to use them properly. In your answer, consider listing at least one rule that’s important to follow when implementing rest parameters. You can also state additional rules to demonstrate your knowledge.
Example: “One of the most fundamental rules to follow when implementing rest parameters is to only use one rest parameter per function. Other important rules to adhere to include making the rest parameter an array type and setting it as the last parameter in your list.”
I hope you find this article helpful.
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