Comment by matthewaveryusa

Here's a really good use of eval:

https://jsfiddle.net/matthewaveryusa/e6EKV/6/

I could have done this without an eval if I decided to write an interpreter. Instead I whitelisted a subset of javascript and evaled it -- I believe the code is simpler with the eval than if I were to write a parser + interpreter.

I challenge anyone to escape my whitelisting :)