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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.

Lesson 2.112m 52sIntermediate18.7k students

Chapters

12:52
  1. 0:00Introduction
  2. 0:49When To Use Generics
  3. 2:04Generic Function Basics
  4. 6:40Generic Type Basics
  5. 9:24Advanced Generic Features

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.

In this lesson you will

  • 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

Resources

Previous lessonLiteral types and const assertions1.3 · 5m 38sNext lessonConstraints and default type parameters2.2 · 4m 13s