As of tcl8.5, Tcl has native support for [lambda], provided by means of [apply] per [TIP] 194 [http://www.tcl.tk/cgi-bin/tct/tip/194].

The [apply] command is documented here http://www.tcl.tk/man/tcl8.5/TclCmd/apply.htm

This enables the following constructions:

   proc lambda {arglist body {ns {}}} {
     list ::apply [list $arglist $body $ns]
   }

   proc curry {lam args} {
     lappend lam {expand}$args
   }

An example of its use:

   set q [lambda {x} {incr x}]
   {expand}$q 1
   % 2

The significant thing here is that (in the above example) $q will contain an anonymous proc which will byte compile itself.  So subsequent invocations of {expand}$q will '''not''' incur a recompilation.

This is ubercool - guilt-free [lambda].