Tcl is a very dynamic language.  The proc command can be used to create wonderful treats that allow new programming styles.  This page serves as a collection of those treats.


   * [Implicit upvar]
   * [ObjectProc]  implements a type checking table-oriented proc
   * [Pass by reference] similar to Implicit upvar
   * [Guarded proc]
  

A somewhat related tool would be [Arrays as cached functions]