joubertnel/ember.js — comment on commit fc297108317ae4fb26dabd97e90cf409b724d2a6
File: packages/ember-states/lib/view_state.js line 8
By kselden:

Why define this as _appendView? it doesn't need to be a member, it could just be function defined in the outer function scope.

Making private functions inaccessible inside a closure vs using an underscore allows minifiers to munge the name.