A procedure is a [routine] that has a name  that can be used as the first
[word] in a [command].  [proc] creates a new procedure, and so do the [C]
functions `Tcl_CreateObjCommand()` and friends. `[info commands]` provides a
list of available procedures, and `[info procs]` provides a list of available
procedures that were created by `[proc].`



** Description **

A  '''procedure''' has name in a certain [namespace], and can only be found
when that namespace is in the [namespace%|%resolution path].  When a procedure
is called, a new [level] is created to hold the variables local to that call,
and that namespace [namespace current%|%current namespace] becomes the
[namespace current%|%current namespace].  Arguments to the procedure are
available as variables at in the new level.



See [global] or [variable] or [upvar] on how to "import" variables from upper scopes.

A procedure is like a function in that it always returns a value.  When the
purpose of a procedure is only to produce a side effect, its value is usually
the empty string.  If there is no explicit `[return]`, then the value of the
last command is the value of the procedure.



** Page Authors **

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