Step 0 – TypeScript Introduction

TypeScript is a statically-typed superset of JavaScript that provides developers with optional type annotations, better tooling, and improved error checking. It was developed and is maintained by Microsoft, and has gained a lot of popularity in recent years.

Benefits of TypeScript

  1. Static Typing: TypeScript allows you to specify types for variables, function parameters, and return values, which helps catch errors at compile-time rather than run-time.
  2. Better Tooling: Because TypeScript provides type information, editors and IDEs can provide better code completion, error highlighting, and refactoring support.
  3. Improved Error Checking: TypeScript can detect errors such as null/undefined values, type mismatches, and incorrect method calls before your code runs, making it easier to catch and fix errors.
  4. Backwards Compatibility: TypeScript is designed to be a superset of JavaScript, so any valid JavaScript code is also valid TypeScript code.

TypeScript vs JavaScript

TypeScript is often compared to JavaScript, but there are some key differences:

  • TypeScript has optional static typing, while JavaScript does not.
  • TypeScript has a stricter syntax and more advanced language features than JavaScript.
  • TypeScript code must be compiled to JavaScript before it can run in the browser or on a server.

Using TypeScript

To start using TypeScript, you need to install it using NPM or another package manager. Once installed, you can use the tsc command-line tool to compile TypeScript code to JavaScript. You can also configure your editor or IDE to provide better support for TypeScript.


In this diagram, you can see that TypeScript is a superset of JavaScript, which means that any valid JavaScript code is also valid TypeScript code. TypeScript provides additional features such as type annotations, classes, interfaces, and more, which can help catch errors at compile-time and make your code easier to maintain.


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