Which statement is true about TypeScript?

• A. It is a JavaScript alternative
• B. It introduces dynamic typing
• C. It adds static typing to JavaScript
• D. It is only used for server-side programming

Answer: (C)

TypeScript is designed to enhance JavaScript by adding static typing. This means that you can specify the types of variables, function parameters, and return values at compile time, which helps catch errors early in development. Static typing allows developers to write more predictable and maintainable code, as it provides better tooling support, such as autocompletion and type-checking in integrated development environments (IDEs).

This type system is optional, but it significantly improves the experience of working with large codebases or when collaborating in teams. As TypeScript code is eventually transcompiled into plain JavaScript, the resulting JavaScript code can run in any environment that supports JavaScript.

The other options either misrepresent TypeScript’s features or limitations. For example, suggesting it is an alternative to JavaScript overlooks that TypeScript is built on top of JavaScript and intended to be a superset rather than a separate language. The claim that it introduces dynamic typing contradicts its primary purpose of enforcing static typing. Lastly, stating that it is only for server-side programming ignores its applicability in client-side applications as well, as TypeScript can be used for both frontend and backend development.