Hi guys! I'm learning JS and I didn't understand the if part of this code. Could someone help me, please?

Question

var a = [2, 1, 2, 0, 4]
var b = []
for(i = 0; i <= a.length; i++) {
if (i == a[i]) {
b.push(++i);
}
}
console.log(b.length);

Answer 1

Print i and a[i] to console to see their values

Answer 2

If value of array at index i is equal to the index i, then add ++i to b list.
At indexes 1,2,4 the values are 1,2,4 so adding 2,3,5 to b list.
Hope it helps...