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Typed Object ↔ Type to ref any non-Primitive; as Record or Dictionary

Index Signature​

TS Syntax to express Dictionary with arbitrary key map to value

Generic Object Types

TS annotate the following object

let point = {x: 10, y: 20}

let point: {x: number; y: number } = {x: 10, y: 20}

let point: {x: number; y: number} = {x: 10, y: 20}

object type values must be separated by semicolon

TS annotate destructured object properties

const profile = {
  name: "bob",
  age: 20,
  coords: {
    lat: 0,
    lng: 15,
  },
  setAge(age: number): void {
    this.age = age;
  },
};

destructure and TS annotate age from profile object above: const { age }: { age: number } = profile;
destructure and TS annotate lat & lng from profile object above: const { coords: { lat, lng } }: { coords: { lat: number; lng: number } } = profile;

interface​

Type to define Object shape & behavior blueprint

Object Literal Type​

Type Annotation for Object Literal, use for inline anon Object pass as arg

Property Modifier​

TS Syntax to specify property's Type, if optional? & if writable?

Typed Classes

object structure can be Record || Dictionary

References​