typescript types union code example

Example 1: union value typescript

let myVar : string | number;        //Variable with union type declaration
 
myVar = 100;            //OK
myVar = 'Lokesh';       //OK
 
myVar = true;           //Error - boolean not allowed

Example 2: typescript union types

type Cow = {
  name: string;
  moo: () => void;
};

type Dog = {
  name: string;
  bark: () => void;
};

type Cat = {
  name: string;
  meow: () => void;
};

// union type
type Animals = Cow | Dog | Cat;