For Loops in JavaScript

 for (let i = 0; i < 10; i++) {

    console.log(i);

}

//Program to add first n natural numbers

let sum = 0

let n = prompt("Enter the value of n");

n = Number.parseInt(n);

for (let i = 0; i <= n; i++) {

    sum = sum + i;

}

console.log("Sum of first " + n + " natual numbers is " + sum);

let obj = {

    harry: 90,

    shubh: 45,

    shivika: 56,

    ritika: 57,

    shiv: 23

}

//For in loop

for (let a in obj) {

    console.log("Marks of " + a + " are " + obj[a]);

}

//For of loop

for (let b of "Harry") {

    console.log(b);

}