JavaScript iteration techniques, good technical interview material (newmediacampaigns.com)

I read "JavaScript iteration techniques" and think "that sounds interesting" - then I read "good technical interview material" and feel sad.

If someone doesn't find the subject interesting in its own right, why would they want a job where they do related tasks all day?

If the only reason you clicked that link is to prep for a job interview, please take some time and find your passion in life.

I thought we decided against using brainteaser, gimmicks, and parlor tricks in code interviews.