Having problems understanding nested for loops please help. Why is this code producing 12

Question

var b =0;
for( var i = 0; i<=2 ; i++) {
for(var j =0; j<=3; j++) {
b++;
}
}

Answer 1

For every iteration of the outer loop, the inner loop runs 4 times from 0 to 3. So the outer loop runs 3 times from 0 to 2. So 4*3=12.