Nested for loops in JS

Question

I can't figure out nested for loops. My head is spinning when I see two for loops one after the other. Can someone explain please? Am I missing a lesson or another explanation here? Thank you:

var arr = [[1,2], [3,4], [5,6]];:
for (var i=0; i < arr.length; i++) {
for (var j=0; j < arr[i].length; j++) {
console.log(arr[i][j]);
}
}

Answer 1

It will start from the outer or top loop, looping 3 times as there are 3 arrays. It well enter each array or namely there indexes - for example arr[0][1] would be equal to 2 in this case - and output each index to the console.

Answer 2

thank you Mark!

Answer 3

so i = 3 and j = 2 (length of each array)?