TYPESCRIPT

how to declare variable in typescript

const variableSample: number = 0;
let variableSample: number = 0;

how to define types in typescript

type Person = {
  name: string;
  age: number;
};

const person: Person {
	named: 'Rex'
  	age: 23
}
 
function greet(person: Person) {
  return "Hello " + person.name;
}

typescript variable types

let name: string; // stores text
let age: number; // stores numbers
let isMale: boolean; // stores a true or false values
let typeAny: any; // stores any type of value
let typeNull: null = null; // can only store a null value
let typeUndefined: undefined = undefined; // can only store undefined value

// these are the basic types of variables in TypeScript
// and of course you can change let to const

typescript variable

var name: string = 'Bulbul'; 
const age: number = 34;
let email: string = 'bulbul.cse@outlook.com';

how to define types in typescript

interface Person {
  name: string;
  age: number;
}

const person:Person {
	name: "Rex",
    age: 20
}
 
function greet(person: Person) {
  return "Hello " + person.name;
}