TypeScript interview questions

Preview Questions

1. What is TypeScript and why use it?

   TypeScript is a programming language developed by Microsoft that extends JavaScript by adding static typing capabilities. It is a superset of JavaScript, meaning all valid JavaScript code is also valid TypeScript code....

2. What are primitive types in TypeScript?

   TypeScript includes several primitive data types corresponding to JavaScript's primitive types. The most fundamental primitive type is string, used for textual data enclosed in quotes like "hello" or 'world'. String...

3. What are interfaces in TypeScript?

   Interfaces in TypeScript define contracts describing the structure of objects. An interface specifies what properties an object must have and what types those properties should be. Once defined, interfaces can be used...

4. What are generics in TypeScript?

   Generics enable writing flexible and reusable code that works with multiple types while maintaining type safety. Instead of hard-coding a specific type, generics use type parameters allowing the same code to work with...

5. What are access modifiers in TypeScript?

   Access modifiers control visibility and accessibility of class members including properties and methods. TypeScript provides three main access modifiers: public, private, and protected, enabling encapsulation and...

6. What is the difference between interfaces and type aliases?

   Interfaces and type aliases both define object shapes and structures but with some important differences. Interfaces use the interface keyword and type aliases use the type keyword, providing different syntax for...

7. What is a tuple type?

   Tuple types represent arrays with a fixed number of elements where each element has a specific type. Tuples are more specific than regular arrays which can contain any number of elements of the same type. Tuples provide...

8. Explain "any" type and when should you use it?

   The any type represents any possible value and essentially disables type checking for that variable. Using any is equivalent to opting out of TypeScript's type safety for specific variables. The compiler allows any...