Comment by catlifeonmars

S-expressions are great. They are trivial to implement parsers for. For a while I used S expression parsing and evaluation as a technical coding screen interview question because it is feasible to implement a functional (pun intended) programming language using S-expressions in the space of an interview.

While not the point of the interview, the best part for me was seeing a candidate’s face light up when they realized they implemented a working programming language.