In this blog we will see some of the type script interview Questions in type script.
1. What is undefined in TypeScript?
A variable is given the value of undefined when it is declared but not initialised. On its own, it is not particularly beneficial. If a variable has been declared but not given a value, it is undefined. A variable is given the value null, which stands for nothing.
2.Explain the purpose of the never type in TypeScript.
The never type, as its name implies, represents values that never happen. A function that consistently throws exceptions or never returns a value, for instance, can designate its return type as never.
3.Explain how enums work in TypeScript?
Named constants can be made using enums. It is a straightforward method for giving numerical constant values more amiable names. The word “enum,” its name, and its members make up the definition of an enum.
4.What is the typeof operator? How is it used in TypeScript?
Similar to JavaScript, the typeof operator in TypeScript returns the type of the operand as a string.
5.What are the rest parameters and arguments in TypeScript?
A function can take as many array parameters as it wants by using the remainder parameter. The function can accept one or more parameters, which is indicated by the notation ‘…’.
6. What is parameter destructuring?
A function can unpack the object passed as an input into one or more local variables by using the parameter destructing technique.
7. Explain the TypeScript class syntax.
Classes are completely supported by TypeScript. With the addition of type support for member declarations, TypeScript’s class declaration syntax resembles JavaScript’s.
8. Explain the arrow function syntax in TypeScript.
Arrow functions provide a short and convenient syntax to declare functions. They are also called lambdas in other programming languages.
9. Provide the syntax for optional parameters in TypeScript.
A function can mark one or more of its parameters as optional by suffixing its name with ‘?’. In the example below, the parameter greeting is marked optional.
10. What is the purpose of the tsconfig.json file?
A tsconfig.json file in a directory marks that directory as the root of a TypeScript project. It provides the compiler options to compile the project.
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