Anyone can explain pls?

Question

I didn't understand.

https://code.sololearn.com/Wp6DBT9r01rZ/?ref=app

Answer 1

var a = 22;
var a = a % 5;
var a = a * 6;
var a = a + 7;
alert(a);
Really, you shouldn't declare var a every line. But still, it works.
1: a is 22
2: a is 22 % 5 = 2
3: a is 2 * 6 = 12
4: a is 12 + 7 or 19.
I hope this is correct?

Answer 2

thanks @j.g.