(Incomplete) The introduction to TypeScript Generics you've been missing

Note: this is an unfinished draft

by @swyx, with direct attribution and acknowledgement of @andrestaltz's introduction to Reactive Programming

⚠️Note: this is a work in progress - I am not even a TypeScript expert, I am merely Learning In Public and jotting down non obvious, useful notes.

First thing to do is read the official Generics guide from the TS Handbook. I am not here to compete with the docs.

Based on this, I assume you know:

• where to place angle brackets
  • especially in classes and interfaces
• etc from the intro

Structure

• Why you can't avoid Generics
• Concepts
  • Assignable (Compatibility)
• Constructor Generics
  • Promise<>
• Interface Modification Inbuilt Generics
  • Partial
  • Readonly
  • Pick
  • Omit
• Union Type Inbuilt Generics
  • Exclude (parallel to Omit)
  • Extract
  • NonNullable
• Union Type AND Interface Modification Inbuilt Generics
  • Record
• Extractor Inbuilt Generics
  • ReturnType
  • InstanceType
  • ThisType (ignore)
  • Required
• Know the Keywords
  • readonly
  • extends and implements
  • keyof
  • Mapped Types -> partial
• Resources You Might Miss
  • TS Release notes https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-1.html
  • Basarat on Generics https://basarat.gitbooks.io/typescript/docs/types/generics.html
  • 2ality https://2ality.com/2018/04/type-notation-typescript.html
  • sharifsbeat https://dev.to/busypeoples/notes-on-typescript-pick-exclude-and-higher-order-components-40cp
  • https://dev.to/busypeoples/-notes-on-typescript-react-and-generics-35c9
  • testing types generics https://www.youtube.com/watch?v=nygcFEwOG8w&feature=share