TypeScript: the typed superset of JS

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This is an ongoing work. See this repo, until new advice, as a collection of notes. Thanks!

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Notes

As I did years ago with React (tutorial that I should resume someday; please, forgive my laziness), I decided to put (and publish) some notes related to the new kid on the block, the JS Superset TypeScript.

Later, we will use typescript locally (feel free to install it as a global package: npm install -g typescript). But, for the moment, we consume repl.it

Index

• Intro

• Structural Typing

• Type Inference and Type Annotation

  • Type Annotation
  • Type Inference
    • Const Assertion

• Types:

  • String
  • Number
  • Boolean
  • Union Types (OR)
    • Discriminated Unions
  • Intersection Types (AND)
  • Null
  • Undefined
  • Void
  • Never
  • Any
  • Unknown
  • Object
    • Optional modifier (?)
    • Non-null assertion operator (!)
  • Array
  • Tuple
  • Enum
  • Set

• Type Alias and Interfaces:

  • Alias
    • Implements
    • Utility types
      • Readonly
      • Required
      • Record
      • Partial
  • Interfaces
    • Extends
    • Implements

• Classes:

  • Classes ... here

Functions:

• Functions

Type Assertions, Type Casting and Type Declaration

• Type Assertions
• Type Casting
• Type Declaration

Type Guards:

• Type Guards

Intersection types:

• Intersection Types

Generics:

• Generics