Generic functions and inference

A type parameter links an input type to an output type. Most of the skill is letting inference do the work rather than annotating call sites.

What this lesson covers

• Relate argument and return types with a type parameter
• Let inference fill in type arguments at the call site
• Recognise when a generic adds nothing over a union

This lesson sits in Generics, part of TypeScript for Application Developers. It assumes what came before it and leads directly into the next lesson in the module.