lprepend - insert elements in front of a list

    :   '''lprepend''' ''listVar e ?e ..?''

This is not a command included in Tcl. It is useful for implementing [stacks and queues].
[lunshift] implements the same functionality, but only for one element. 

See also: [lpop], [lshift] and [Chart of existing list functionality].

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** Implementation **

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proc lprepend {listVar args} {
    upvar 1 $listVar l

    lappend l; # bring l to live.
    set l [K* [concat $args $l] [set l {}]]
}
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[LV] you reference a function called K* - where is that implemented? 

[aricb] I believe that's the "[K%|%generalized K combinator%|%]":

 proc K* {arg args} {set arg}

[LEG]: Yes, it is the generalized Kombinator and sorry: here comes the "pure Tcl" implementation of lprepend:
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proc lprepend {listVar args} {
    upvar 1 $listVar l

    lappend l; # bring l to live.
    set l [concat $args $l[set l {}]]
}
======

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!!!!!!
%| [Category Command] |%
!!!!!!