input a callback function and print index or value. ye array ki value ko iterate karega or index and value ko print karega.
const users = [
{firstName: "harshit", age: 23},
{firstName: "mohit", age: 21},
{firstName: "nitish", age: 22},
{firstName: "garima", age: 20},
]
// users.forEach(function(user){
// console.log(user.firstName);
// });
users.forEach((user, index)=>{
console.log(user.firstName, index);
})
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