[Richard Suchenwirth] - Design patterns have been made famous by the book "Design Patterns. Elements of Reusable Object-Oriented Software"
by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides (The Gang of Four). A short list of the 23 patterns in that book is at http://wiki.cs.uiuc.edu/PatternStories/DesignPatterns

Most patterns assume OO approaches, inheritance, etc., and thus are more suited for [Incr Tcl design patterns]. But some can be done in pure Tcl, or are used in the Tcl implementation. Let's brainstorm...

   * '''Chain of responsibility''': We can have that effect with
 rename existingName _otherName
 proc existingName {...} {
    # do the special stuff, eventually:
    _otherName
 }
See [Overloading widgets], [Guarded proc] for concrete examples.

   * '''Command''': Not sure (especially on the "undo" aspect), but isn't the following already a simple implementation?
 set cmd [list keyword arg arg...]
 # some time later:
 eval $cmd

   * '''Flyweight''': Re-use of small objects from a pool, so distinct objects are only created once, and referred to later. Used since 8.4 in the C implementation of ''split $string ""''

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