I explained advantages, disadvantages and hidden problems every ways. It wasn't right ansher for them. They wanted see an another way write ()=> openUser(id). which will be openUser.bind(this, id). But it exactly same solution. All difference a way how you can write it. But not only technical part of interiview disapoined me. After interview a was a little angry a waste my time. I explained all what i think about this type interview and which problem i meet. But all what she repliet me: - we hope on good result of interview. - but now i doesn't sure, what i want work in luxsoft. - you should think a positive way. Anyway, they asked me about second interview. I choosed time (i don't why. Maybe i had a hope on better second part). They take a pause for check free person. And after it they disappeared. Disappointment. It amazing how bad process they have.