map() – My Blog

input callback function and return value / return new array. Ye new array dega or old array wesa hi rahega, agar hume kis array me se kisi index ya array of object ki key ki value ko get karna hai to iska use karenge.

// const numbers = [3,4,6,1,8];
// const squareNumber = numbers.map((number, index)=>{
//     return index;
// });
// console.log(squareNumber);

const users = [
    {firstName: "harshit", age: 23},
    {firstName: "mohit", age: 21},
    {firstName: "nitish", age: 22},
    {firstName: "garima", age: 20},
]

const userNames = users.map((user)=>{
    return user.firstName;
});

console.log(userNames);