The map() method creates a new array populated with the results of calling a provided function on every element in the calling array.

const array1 = [1, 4, 9, 16];

// pass a function to map
const map1 = array1.map(x => x * 2);

console.log(map1);
// expected output: Array [2, 8, 18, 32]

Now, how we can create our own map function from scratch

function map(array, cb) {
    let result = [];
    for(let i = 0; i < array.length; i++) {
        result.push(cb(array[i], array, i))
    }
    return result;
}

console.log(map([1, 2, 3], (element) => element + 1)) // [ 2, 3, 4 ]

If you like this post, I can implement more array or object methods.

See you!!