Why is this happening

Question

I just started to learn js and now i'm trying to experiment. When I try to run the code
(https://code.sololearn.com/WfFfgdoMAvx7/?ref=app) I see only empty space. First I thought it's happening because there's something wrong with my code. But after that every code I try to run in this app turns out a white screen so it starts to look like an app bug or something.

Answer 1

for (i=10; i>=4; i-=2) {
console.log(i);
}
have a look at the bottom right where is says "JavaScript Console"

Answer 2

but why did you write "-="? it starts to work after i replaced "i-2" with "i-=2"

Answer 3

for third argument of for statement .

i++ and i-- is post-increment, only used for difference of 1.

Other difference more than 1, you need to use assignment statement, such as i=i+3 or i=i-6