js problem

Question

why it result 11
Explain this code!

var num= 1;
for(; num <6 ;num+=2){
num =num* num
}
console.log(num)
//how result is 11

Answer 1

Before loop:
num = 1

** Begin loop

Iteration 1 (num = 1)
Is num < 6 // yes
num = 1 * 1 // 1
num = 1 + 2 // 3

Iteration 2 (num = 3)
Is num < 6 // yes
num = 3 * 3 // 9
num = 9 + 2 // 11

Iteration 3 (num = 11)
Is num < 6 // no

** Loop ends

num value is now 11, log it in JS console.

Hth, cmiiw