Why the Other One with (arr[k]) is 1, 2, 3 but the Other One with Just (k) is 0, 1, 2?

Question

• First One

var arr = [1, 2, 3];
for (let k = 0; k < arr.length; k++) {
document.write(arr[k]);
}

• Second One

var arr = [1, 2, 3];
for (let k = 0; k < arr.length; k++) {
document.write(k);

- Good day, pals. Just asking why the output of First One is 1, 2, 3 is
not the same at the Second One?

Answer 1

Jonathan Pizarra, thank you, man.

Answer 2

In the first one, you are accessing and printing the values of arr using k which are:
k = 0 >> arr[0] >> 1.
k = 1 >> arr[1] >> 2.
k = 2 >> arr[2] >> 3.
so the output is 1, 2, 3.

On the second one, you are only printing the values of k which are:
k = 0.
k = 1.
k =2 .
therefore 0, 1, 2.