for loop, for in loop, for of loop in javascript

 here in this blog we are going to work with the 

1. for loop
2. for in loop 
3. for of  loop

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so here are the following codes as follows

//for loop in javascript

for (let i=0;i<5;i++){console.log(i)}

// program to add first natural numbers

let sum=0

let n = prompt("enter the value of n")

n= Number.parseInt(n)

for(let i=0;i<n;i++)//here we are using let so the value is only valid inside the curly brackets only but when we work with var instead of let than it becomes global and outside also i value can be obtained

{sum += (i+1)}

console.log("the sum of "+ n + " natural numbers is" + sum )

//for in loop in javascript

// let obj = {

//   sabih:99,

//   anwar:98,

//   shayaan:100,

//   ghufrana:23,

//   rizwana:66

// }

// for(let a in obj){console.log("marks of "+ a+" are "+obj[a])}

// // for of loop in javascript it mainly works in arrays

// for(let b of "shayaan"){console.log(b)}