TypeScript extends JavaScript by adding types to the language. TypeScript speeds up your development experience by catching errors and providing fixes before you even run your code.

TypeScript is JavaScript with added syntax for types. Our "Try it Yourself" editor makes it easy to learn TypeScript. You can edit TypeScript code and view the result in your browser. …

Downloadable syntax reference pages for different parts of everyday TypeScript code. Learn more about Classes, Interfaces, Types and Control Flow Analysis

The syntax (a: string) => void means “a function with one parameter, named a, of type string, that doesn’t have a return value”. Just like with function declarations, if a parameter type isn’t …

TypeScript has a specific syntax for typing function parameters and return values. Read more about functions here. The type of the value returned by the function can be explicitly defined. If …

Mar 4, 2025 · Here’s a complete TypeScript cheat sheet that covers everything from installation to advanced topics, and examples. 1. Installation. To use TypeScript, you need to install it …

Jan 17, 2017 · At its core, optional chaining lets us write code where TypeScript can immediately stop running some expressions if we run into a null or undefined. The star of the show in …

Explore the basic syntax of TypeScript, including variable declarations, data types, and function definitions to enhance your coding skills.

You’ll see that there are two syntaxes for building types: Interfaces and Types. You should prefer interface. Use type when you need specific features. With TypeScript, you can create complex …

Typescript needs to know that the function into which you pass an object is functioning like a type guard. If it just returns type true or false, how can Typescript know that it's indeed a type guard …