What is TypeScript?

TypeScript is a statically typed superset of JavaScript that compiles to plain JavaScript.

What does 'static typing' mean in TypeScript?

Static typing means that the type of a variable is known at compile time, allowing for early error detection and better tooling support.

How do you declare a variable with a specific type in TypeScript?

You can declare a variable with a specific type using the syntax: let variableName: type = value; Example: let age: number = 25;

What is an interface in TypeScript?

An interface is a way to define a contract for an object's shape. It specifies the properties and methods an object should have.

How do you define an interface in TypeScript?

You can define an interface using the `interface` keyword: interface Person { name: string; age: number; }

What is a union type in TypeScript?

A union type is a type that can be one of several types. It is written as a vertical bar (|) separated list of types. Example: let result: number | string;

How do you define an enum in TypeScript?

You can define an enum using the `enum` keyword: enum Color { Red, Green, Blue }

What is the purpose of the `any` type in TypeScript?

The `any` type is used when you want to opt-out of type checking for a variable. It can hold any type of value and is often used when working with dynamic content or migrating from JavaScript.

What is a generic in TypeScript?

Generics allow you to create reusable components that can work with a variety of types rather than a single one. They provide a way to make components type-safe for different types.

How do you define a function with a generic type in TypeScript?

You can define a function with a generic type using angle brackets: function identity<T>(arg: T): T { return arg; }