Matthew Tyson updated the article with newer syntax and code examples in May 2024. This article covers a sample of JavaScript statements you are most likely to see and use in your JavaScript programs.

When you annotate JavaScript code to create TypeScript, most of the type information you apply will be familiar, since they’ll come from JavaScript types. But how and where you apply those types ...

As with almost every programming language, JavaScript treats various types of values differently. A string like “Hello world” is very different from a number like 42. But what types are available, and ...