keyof (TypeScript)

The `keyof` operator produces a union of the property names (keys) of a type. For an object type, `keyof T` is a literal union of all its key strings.

Welcome to LearnCodingFast — free, interactive programming lessons covering Python, JavaScript, Java, C++, C#, SQL, HTML/CSS, React, AI and more. Every course is hands-on with examples you can run in your browser.