It is pretty true. There are not many rules in Tcl. One of them is that the first word is a procedure, and the following words are arguments. Procedures are de

It is pretty true. There are not many rules in Tcl. One of them is that the first word is a procedure, and the following words are arguments. Procedures are defined using "proc", which is also a procedure: proc sum {x y} { return [expr $x + $y] } Here proc is taking 3 args: name, args, and body (curly braces wind up enclosing one arg). But you can also redefine proc, using proc. Here is a neat function which uses this to keep other procs from being given new definitions: rename proc _proc _proc proc {name args body} { if {[info commands $name]!=""} { puts stderr "warning: [info script] redefines $name" } _proc $name $args $body } The above is taken from here: https://wiki.tcl-lang.org/page/Guarded+proc https://wiki.tcl-lang.org/page/Guarded+proc List of overloaded procs here: https://wiki.tcl-lang.org/page/Overloading+Proc https://wiki.tcl-lang.org/page/Overloading+Proc