We declaring some variable with core data type.

let num:number = 10;
let str:string = "hello";
let  isTrue:boolean = true;

We creating an object

type objType = {name:string,age:number,email:string};

const person:{name:string,age:number,email:string} = {
    name:"krishna",
    age:28,
    email:'krishna@gmail.com'
}

const user:objType = {
    name:"ganesh",
    age:25,
    email:'ganesh@gmail.com'
}

console.log(person.name)

We making own specific data type that is number data type.

let data:5 = 5;

We are printing array with different data type.

let arr:number[] = [32,6,23,879];
let arr2:string[] = ["java","php","node","python"];
let arr3:any[] = ["hello",123,true];
let arr4:[string,number,boolean] = ["hello",123,true];
let arr5 = ["hello",123,true];

arr2[2] = "angular";
arr2.push("Django");
console.log(arr);

We are printing data of number data type.

const num:number = 10;

console.log(num);