This really depends upon which functional language you're referring to. Each one has a different set of features. JavaScript is in some sense an impure functio

This really depends upon which functional language you're referring to. Each one has a different set of features. JavaScript is in some sense an impure functional language, however hastily designed in various places. In the context of CL, the canonical example would be "macros". But CL has a bag of other features that makes it appealing.