Help me understand this JS question?

Question

Any JS ninjas willing to volunteer some effort ... What's the story???

var x=1;
for(;x<6;x+=2){
x=x*x;
}

alert(x);

Answer 1

are you already familiar with for loops?

in this particular example you skip the first "parameter" of an for-loop which is the initialization of a (for e.g) iterator variable and use the already existing variable named x instead

per iteration you increase x by 2 and multiply it with itself

*debugger*

x is 1

is x smaller than 6? yes => x=x*x (1*1 = 1)
x += 2

x is 3

is x smaller than 6? yes => x=x*x (3*3 = 9)
x += 2

x is now 11

is x smaller than 6? no!
alert (x)

11

Answer 2

Rad!! Thank you for your help :)

Answer 3

I understand it (3*3=9) but the next one I don't understand × +=2 please explain it