Purpose: Comparison of available extensions with respect to the provided list functionality.
Caveat: This chart has (in 2008) been left unattended for several years, so some information may be out of date, and newer packages may be missing.
Entries are prefixed with a shorthand for the extension containing the command. Similar or equal functionality is grouped together wherever possible.
Lars H, 2008-09-10: The (EL) command names listed below doesn't match those of the ExtraL documentation [L1 ], e.g. oneof below is called inlist in the docs, lunion below is called list_union in the docs, … Does anyone know how that may come?
Determine if the element is a list element of list. If the
element is contained in the list, 1 is returned, otherwise,
0 is returned. (EL) lunion list list ...
returns the union of the lists
(TclX) union lista listb
Procedure to return the logical union of the two specified lists.
Any duplicate elements are removed.(EL) lcommon list list ...
returns the common elements of the lists.
(TclX) intersect lista listb
Procedure to return the logical intersection of two lists.
The returned list will be sorted. (EL) leor list1 list2
returns the elements that are not shared between both lists
(TclX) intersect3 lista listb
Procedure to intersects two lists, returning a list containing
three lists: The first list returned is everything in lista that
wasn't in listb. The second list contains the intersection of
the two lists, and the third list contains all the elements
that were in listb but weren't in lista. The returned lists
will be sorted. (TclX) lempty list
Determine if the specified list is empty. If empty, 1 is
returned, otherwise, 0 is returned. This command is an
alternative to comparing a list to an empty string, however
it checks for a string of all whitespaces, which is an empty
list. (JT) Juf::Sequence::assign LIST ?NAME ...?
Sets value of the variables specified by the NAME arguments to
that of the existing elements of LIST. Returns remaining list
elements. If the number of variables exceeds the list length,
the remaining variables will be removed. By Brent Welch. Assigns a set of variables from a list of values.
If there are more values than variables, they are ignored. If
there are fewer values than variables, the variables get the empty
string. Assign successive elements of a list to specified variables.
If there are more variable names than fields, the remaining
variables are set to the empty string. If there are more
elements than variables, a list of the unassigned elements
is returned.
For example,
lassign {dave 100 200 {Dave Foo}} name uid gid longName
Assigns name to ``dave'', uid to ``100'', gid to ``200'', and
longName to ``Dave Foo''. Search the elements of list, returning a list of all elements
matching pattern. If none match, an empty list is returned.
The mode argument indicates how the elements of the list are
to be matched against pattern and it must have one of the
following values:
-exact The list element must contain exactly the same string
as pattern.
-glob Pattern is a glob-style pattern which is matched against
each list element using the same rules as the string
match command.
-regexp Pattern is treated as a regular expression and matched
against each list element using the same rules as the
regexp command.
If mode is omitted then it defaults to -glob. Returns a new list with all elements of LIST matching PATTERN
as with string match. == glob '''!''' All words not contained in list pattern are removed from list.
In set-notation: result = intersect (list, pattern). This is
not completely true, duplicate entries in 'list' remain in the
result, given that they appear at all. All words contained in the list pattern are removed from list.
In set-notation: result = list - pattern. Returns the set
difference of list and pattern. '''Negative match'''.(EL) llremove ?-sorted? list1 list2 ?var?
returns a list with all items in list1 that are not in list2. with
the -sorted option the command will usually be a lot faster, but
both given lists must be sorted with lsort; The optional $var give
the name of a variable in which the removed items will be stored. (EL) lremdup ?-sorted? list ?var?
returns a list in which all duplactes are removed. with the
-sorted option the command will usually be a lot faster,
but $list must be sorted with lsort; The optional $var gives
the name of a variable in which the removed items will be stored. (TclX) lrmdups list
Procedure to remove duplicate elements from a list. The returned
list will be sorted. (PB) ::pool::list::uniq list
Removes duplicate entries from list. Returns the modified list.
(EL) laddnew listName ?item? ...
adds the items to the list if not already there
(JT) Juf::Sequence::append ?OPTION ...? NAME ?VALUE ...?
Works like the Tcl builtin lappend, but considers these options:
-nonempty Append only non-empty values.
-- Marks the end of the options. The argument
following this one will be treated as NAME
even if it starts with a -. (TclX) lvarcat var string ?string...?
This command treats each string argument as a list and concatenates
them to the end of the contents of var, forming a a single list.
The list is stored back into var and also returned as the result.
if var does not exist, it is created. (PB) ::pool::list::pop listVar
Removes the last element of the list contained in variable listVar.
Returns the last element of the list, or {} in case of an empty list. (JT) Juf::Sequence::pop NAME ?COUNT?
Removes COUNT element from the end of the list stored in the
variable NAME and returns the last element removed. COUNT
defaults to 1. (EL) lpop listName ?pos?
returns the last element from a list, thereby removing it from
the list. If pos is given it will return the pos element of the
list. (JT) Juf::Sequence::shift NAME ?COUNT?
Removes COUNT element from the list stored in the variable NAME
and returns the last element removed. COUNT defaults to 1.(EL) lshift listName
returns the first element from a list, thereby removing it from
the list. (PB) ::pool::list::shift listVar
The list stored in the variable listVar is shifted down by one.
Returns the first element of the list stored in listVar, or {}
for an empty list. The latter is not a sure signal, as the list
may contain empty elements. (PB) ::pool::list::remove listVar position
Removes the item at position from the list stored in variable
listVar. (PB) ::pool::list::exchange listVar position newItem
Removes the item at position from the list stored in variable
listVar and inserts newItem in its place. Returns the changed list. (TclX) lvarpop var ?indexExpr? ?string?
The lvarpop command pops (deletes) the element indexed by the
expression indexExpr from the list contained in the variable var.
If index is omitted, then 0 is assumed. If string, is specified,
then the deleted element is replaced by string. The replaced or
deleted element is returned. Thus ``lvarpop argv 0'' returns the
first element of argv, setting argv to contain the remainder of the
string.
If the expression indexExpr starts with the string end, then end
is replaced with the index of the last element in the list. If the
expression starts with len, then len is replaced with the length
of the list. (PB) ::pool::list::push listvar args
The same as 'lappend', provided for symmetry only.
(EL) lpush listName ?item? ?position?
opposite of lpop.
(EL) lunshift listName ?item?
opposite of lshift: prepends ?item? to the list.
The list stored in the variable listVar is shifted up by one.
newElement is inserted afterward into the now open head position. (TclX) lvarpush var string ?indexExpr?
The lvarpush command pushes (inserts) string as an element in the
list contained in the variable var. The element is inserted before
position indexExpr in the list. If index is omitted, then 0 is
assumed. If var does not exists, it is created.
If the expression indexExpr starts with the string end, then end
is replaced with the index of the last element in the list. If
the expression starts with len, then len is replaced with the
length of the list. Note the a value of end means insert the
string before the last element. (PB) ::pool::list::head list
Returns the first element of list.
(PB) ::pool::list::last list
Returns the last element of list.
(PB) ::pool::list::prev list
Returns everything before the last element of list.
(PB) ::pool::list::tail list
Returns everything behind the first element of list.
(EL) remove listName ?item? ...
removes the items from the list
(PB) ::pool::list::delete listVar value
By Brent Welch. Deletes an item from the list stored in
listVar, by value. Returns 1 if the item was present, else 0. (EL) lsub list ?-exclude? index_list
create a sublist from a set of indices. When -exclude is specified,
the elements of which the indexes are not in the list will be given.
eg.:
% lsub {Ape Ball Field {Antwerp city} Egg} {0 3}
Ape {Antwerp city}
% lsub {Ape Ball Field {Antwerp city} Egg} -exclude {0 3}
Ball Field Egg(PB) ::pool::list::select list indices
Idea from a thread in c.l.t.
General permutation / selection of list elements. Takes the elements
of list whose indices were given to the command and returns a new list
containing them, in the specified order. (EL) lcor
gives the positions of the elements in list in the reference list.
If an element is not found in the reference list, it returns -1.
Elements are matched only once. eg.:
% lcor {a b c d e f} {d b}
3 1
% lcor {a b c d e f} {b d d}
1 3 -1(EL) lmerge ?list1? ?list2? ??spacing??
merges two lists into one eg.:
% lmerge {a b c} {1 2 3}
a 1 b 2 c 3
% lmerge {a b c d} {1 2} 2
a b 1 c d 2(EL) lunmerge ?list? ?spacing? ?var?
unmerges items from a list to the result; the remaining items are
stored in the given variable ?var? eg.:
% lunmerge {a 1 b 2 c 3}
a b c
% lunmerge {a b 1 c d 2} 2 var
a b c d
% set var
1 2(EL) lset listName ?item? ?indexlist?
sets all elements of the list at the given indices to value ?item?
(EL) larrayset array varlist valuelist
sets the values of valuelist to the respective elements in varlist
for the given array.(EL) lregsub ?switches? exp list subSpec
does a regsub for each element in the list, and returns the resulting
list. eg.:
% lregsub {c$} {afdsg asdc sfgh {dfgh shgfc} dfhg} {!}
afdsg asd! sfgh {dfgh shgf!} dfhg
% lregsub {^([^.]+)\.([^.]+)$} {start.sh help.ps h.sh} {\2 \1}
{sh start} {ps help} {sh h}(PB) ::pool::list::reverse list
Returns the reversed list.
(PB) ::pool::list::projection list column
Treats list as list of lists and extracts the column'th element of
each list item. If list is seen as matrix, then the procedure
returns the data of the specified column. (PB) ::pool::list::apply cmd list
Applies cmd to all entries of list and concatenates the
individual results into a single list. The cmd must accept exactly
one argument, which will be the current element.(PB) ::pool::list::lengthOfLongestEntry (list)
Determines the length of the longest entry contained in the list.
(AT) lall item_list list expr
List universal quantifier: evaluates expr for all items or item sequences,
and returns 1 if the expresson is true over the whole list, and 0 otherwise(AT) lexit item_list list expr
List existential quantifier: evaluates expr for all items or item sequences,
and returns 1 if the expresson is true for any item in the list, and 0 otherwise(AQ) j:longest_match
find the longest common initial string in a list
-- AK