I was referred for a different UI role by a friend, and I got a call for this role after a month. The recruiter directly called me to my cell instead of dropping a mail. She introduced herself as a recruiter from ____ company located in San Jose, and I couldn't understand it in spite of asking her to repeat.

I remember searching on the Internet for companies in San Jose that started with "Af..." until I got a mail asking for my availability to interview with F5 Networks. The screening process was decent. It was a 1-hour phone interview using Coderpad where there were lot of verbal questions, like the differences between promises and observables.

There were couple of questions where the interviewer typed a few JavaScript snippets and asked what the output would be. They covered the scope and setTimeout concepts. I was asked to demonstrate how event bubbling and stopPropagation works.

After a couple of days, I got a mail from the same recruiter saying I had cleared the screening round and was invited to attend an on-site interview at their San Jose office next week, to which I promptly responded with my availability for the next week. I was told that someone would contact me soon who would book my flight tickets and send flight information.

I did not hear back for four days (Friday to Monday), which included the weekend, so I didn't bother to check with them. Wednesday was supposed to be my onsite interview. When I pinged the recruiter on Tuesday morning asking for my flight details for the next day, I got a reply saying they would have to cancel my onsite because they had found a suitable candidate.

Differences between promises and observables

Demonstrate event bubbling and stop propagation using HTML and JavaScript.

What is the output of:

javascript var x = 1; typeof typeof x;