Infinite Loop in Google Chrome

Question

I think the Javascript code below works like this:

i = 0 first time around.
i = 3 second time.
i = 6 third time.
i = 9 end of loop. 

So the loop should run 3 times, but in Google Chrome it becomes an infinite loop. Is there something I'm missing? (complete beginner)

for (var i = 0; i < 9; i + 3) {
    console.log('hey');
}

Another detail: I've been using visual studio code live server.

I've experimented with different variations and get the same problem.

One variation:

for (var i = 0; i < 10; i + 2) {
    console.log('hey');
}

Answer 1

i + 3 doesn't change i. You probably meant i += 3.