[ink]

I believe you can do this in Python

[ducharmdev]

Yup, you can. Also in Clojure, like this:

(< 1 2 3 4 5 6) => true

[codeflo]

How do you do the (IMO common) 0 <= index < length?

[unlogic]

This you can't do, unfortunately. Would have to do something stupid like `(< -1 index length)`.