JS question

Question

Hello guys, can someone explain this code, please? Thanks a lot.

var b = 0;
for(var i = 0; i <= 2; i++) {
for (var j = 0; j <=3; j++) {
b++;
}
}
alert(b);
Output is 12.

Answer 1

The inner loop runs 4 times, the outer loop 3 times.

So the inner loop will be executed 3 times.

This means, b is increased 3*4 times.

Answer 2

Loop in loop => first 4 steps in the inner loop increment b => 4, then 3 times in the outer loop repeating the inner loop => 3 * 4 => 12.