Why does result equal 1?

Question

var a=[9,5,3];
for (i=1;i<3;i++){
a[0]%=a[i]
}
document.write(a[0]);

Answer 1

9 %=5 //a[0]%=a[1]
now a[0] is equal to 4.then,

4%=3 //a[0]%=a[2]

now a[0] is equal to 1.

well hope you understand

Answer 2

I got it. thanks