If you wrote in Scala or Haskell before you tried TypeScript, you may have found yourself wondering: Where are the Options at?
For those not familiar, here is an excellent introduction to Scala’s
Option type. At a high level,
Option is an abstraction over
null that gives useful semantics around running functions over possibly-null values. It implements a monad, a functor, and some other structures, but that’s not important for this post.
So, based on my experiences on both sides of the interview table, here goes. These are a sampling of questions I’ve asked and been asked when hiring frontend engineers. Keep in mind that some places (like Google) focus more on designing efficient algorithms, so if you want to work there you should practice past CodeJam problems in addition to the stuff below. If you have a question that belongs in one of these lists (or I’ve made a mistake somewhere), shoot me an email.
Flashback to your job interview for your first software engineering job: let’s write a Fibonacci function. We define the base cases of
1, then recurse to generate the rest: