This is a free programming book written by the team at CodeAhoy. It’s goal is to introduce TypeScript to Java developers, highlighting differences, similarities and lots of examples.

TypeScript is an open-source programming language that was developed at Microsoft and released to public in 2012. It is a superset of JavaScript, and adds optional static typing to the language and other features. All TypeScript programs transpiles to JavaScript. TypeScript’s type system offers many benefits, including code completion, earlier detection of errors, and clearer communication between parts of your program.

Why use TypeScript

TypeScript was designed to improve the development of large-scale applications and to make it easier to write and maintain code over time. It was created to add features that are not present in JavaScript, such as classes, interfaces, and modules, which can help developers write more organized and reusable code. In other words, it increases the efficiency of developers working on large applications and help detect errors more easily.

TypeScript is often used in the development of web applications, particularly with frameworks like Angular and React. It’s commonly used for building complex applications usually on server-side but client-side as well:

1. TypeScript’s static typing can help catch errors earlier in the development process, which can be particularly useful when building large-scale server-side applications that need to be reliable and maintainable.
2. TypeScript’s support for classes, interfaces, and other object-oriented programming concepts can make it easier to structure and organize code, which can be particularly useful for server-side applications that need to handle a lot of data and business logic.
3. TypeScript is often used in conjunction with popular server-side JavaScript frameworks like Express, Nest, and Fastify, which can make it easier to build and deploy server-side applications.

There are several alternatives to TypeScript, including Flow, CoffeeScript and Dart. However, TypeScript is widely adopted and has a large and active community, making it a popular choice for many developers.

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