Extension:ArrayFunctions

MediaWiki extensions manual

ArrayFunctions Release status: stable
Implementation	Parser function
Description	Provides a set of pure parser functions that operate on arrays
Author(s)	Marijn van Wezel (Wikibase Solutions)
Latest version	2.0.1 (2026-06-18)
Compatibility policy	Master maintains backward compatibility.
MediaWiki	>=1.40.0
PHP	>=7.4
Database changes	No
Composer	wikibase-solutions/array-functions
Parameters $wgArrayFunctionsMaxPipelineLength $wgArrayFunctionsEnableErrorTracking $wgArrayFunctionsMaxRangeSize $wgArrayFunctionsForeachIterationLimit
Hooks used ParserFirstCallInit ParserGetVariableValueSwitch GetMagicVariableIDs ScribuntoExternalLibraries CargoSetFormatClasses
Licence	GNU General Public License 2.0 or later
Download	Download extension Git [?]: Browse repository (Phabricator · GitHub) Gerrit code review Git commit log Download source tarball
Translate the ArrayFunctions extension if it is available at translatewiki.net
Issues	Open tasks · Report a bug

Documentation for other releases: 1.0 · 1.1 · 1.2 · 1.3 · 1.4 · 1.5 · 1.6 · 1.7 · 1.8 · 1.9 · 1.10 · 1.11 · 1.12 · 1.13 · 1.14 · 1.15 · 1.16 · 1.17 · 2.0.

The ArrayFunctions extension creates a set of pure, Parsoid -compatible (see here) parser functions that perform operations on arrays.

Installation

• Download and move the extracted ArrayFunctions folder to your extensions/ directory.
  Developers and code contributors should install the extension from Git instead, using:

  cd extensions/
  git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/ArrayFunctions
  

• Add the following code at the bottom of your LocalSettings.php file:

  wfLoadExtension( 'ArrayFunctions' );
  // Increase $wgMaxArticleSize to allow for larger arrays (default: 2048)
  $wgMaxArticleSize = 8192;
  

• Configure performance limits as necessary.
• Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

TL;DR

ArrayFunctions defines a collection of parser functions that allow you to work with immutable lists and objects, collectively "arrays". Instead of storing these arrays in memory, they are outputted by the parser function directly, and can be passed around to templates or to other parser functions. While it is possible to create and work with arrays entirely through wikitext, the recommended approach is to use Scribunto (Lua), Semantic MediaWiki or Cargo to create an array that contains all the necessary data, and use ArrayFunctions only for formatting the array. The #af_list and #af_object parser functions should primarily be used for simple, one-off arrays.

ArrayFunctions defines many (over 30) parser functions, but the most useful ones are:

• #af_get – to retrieve a value, or perform some operation succincly;
• #af_pipeline – to create a pipeline of operations to prevent deep nesting;
• #af_foreach – to iterate over an array;
• #af_show – to output a value stored in an array;
• #af_print – to print an array for debug purposes;
• #af_map – to modify all elements of an array;
• #af_template – to invoke a template with data stored in an array;
• #af_list – to create a list;
• #af_object — to create an object;
• #af_zip – to zip two or more arrays together.

Compatibility

ArrayFunctions has a commitment to not breaking backwards-compatibility. This means that user-facing code (e.g. parser functions, Lua fuctions and magic words) will keep working indefinitely, and changes will always be implemented in a backwards-compatible manner.

ArrayFunctions also tries to keep compatibility with older versions of MediaWiki for as long as possible, but due to the nature of extensions, this may not be possible indefinitely. In case an update of MediaWiki breaks a feature that ArrayFunctions relies on, it will be patched in a backwards compatible manner if this is possible. Otherwise, a new MAJOR version of ArrayFunctions will be released.

Compatibility Matrix

ArrayFunctions	MediaWiki	PHP	Scribunto1	Semantic MediaWiki1	Cargo1
2.0.0+	MediaWiki version: ≥ 1.40	PHP version ≥ 7.4.3	Scribunto version ≥ 1.40	Semantic MediaWiki version ≥ 5.0	Cargo version ≥ 3.8
1.15.0+	MediaWiki version: ≥ 1.35	PHP version ≥ 7.4.0	Scribunto version ≥ 1.35	Semantic MediaWiki version ≥ 4.0	Cargo version ≥ 3.0
1.14+	MediaWiki version: ≥ 1.35	PHP version ≥ 7.4.0	Scribunto version ≥ 1.35	Semantic MediaWiki version ≥ 4.0	N/A
1.0-1.13	MediaWiki versions: 1.35 – 1.43	PHP version ≥ 7.4.0	Scribunto version ≥ 1.35	N/A	N/A

¹ Soft dependency; version constraint only applicable when the software is installed.

Performance limits

ArrayFunctions version

≥ 1.16

MediaWiki already limits the total size of arrays through $wgMaxArticleSize .

ArrayFunctions provides a number of configuration parameters to limit the computation time of certain functions and prevent users from performing a denial-of-service attack on your wiki. For backwards-compatibility reasons, these limits are off by default. The available configuration parameters are:

Name	Default	Recommended	Description
$wgArrayFunctionsForeachIterationLimit	-1	~1024	This configuration parameter limits the maximum number of #af_foreach iterations a page is allowed to perform. Setting it to anything below zero will impose no restrictions on the number of iterations.
$wgArrayFunctionsMaxRangeSize	-1	~4096	This configuration parameter limits the maximum size of an array constructed with the #af_range parser function. Setting it to anything below zero will impose no restrictions on the size of arrays constructed with #af_range.
$wgArrayFunctionsMaxPipelineLength	-1	~$wgMaxTemplateDepth / 4	This configuration parameter limits the maximum length of a pipeline (#af_pipeline). Setting it to anything below zero will impose no restrictions on the number of steps in a pipeline.

These limits are reported in the parser limit report, which can be used to tweak the settings or debug a page.

FAQ

How can I define an array to be used throughout a page?

It is not possible to directly define an array to be used throughout a page, because this would require sequential processing of extension tags, which is not supported by Parsoid (see Extension API#No support for sequential, in-order processing of extension tags). Instead, you can pass arrays around as template parameters:

{{My template|{{#af_list:a|b|c}}}}

This way, the array is available in Template:My template as {{{1}}}.

How to iterate over an array?

It is possible to iteratively access elements of an array using #af_foreach:

{{#af_foreach:{{#af_list:red|green|blue}}||color|<nowiki/>
* {{{color}}} is my favourite.
}}

The expected output from the snipped above is:

• red is my favourite.
• green is my favourite.
• blue is my favourite.

Why are values not recognized as arrays?

This may happen because your arrays are too large. MediaWiki internally keeps a counter on the total size of template arguments, which can be increased by increasing $wgMaxArticleSize.

How is this different from extensions such as Arrays or Variables?

The main difference between ArrayFunctions and those extensions is that ArrayFunctions parser functions are pure. This means that instead of modifying or declaring a variable, the parser function directly outputs its result.

For example with #af_map, the given array is not modified; instead, a copy is created, modified and then outputted. No parser function in ArrayFunctions modifies global state: all computation happens solely with the invocation of the parser function. This makes working with ArrayFunctions very different from working with other extensions such as Arrays or Variables. Instead of imperatively modifying an array stored in a variable, function composition must be used to perform more complex operations. For example:

Arrays

{{#arraydefine: fruits | orange, banana, strawberry, apple }}
{{#arraysort: fruits | asc }}
{{#arrayprint: fruits }}

ArrayFunctions

{{#af_pipeline: {{#af_list: orange | banana | strawberry | apple }}
| {{#af_sort: {{{prev}}} }}
| {{#af_print: {{{prev}}} }}
}}

Why is whitespace trimmed from array values?

Whitespace is inherently implicit in wikitext. In order to be consistent with this behaviour, whitespace is recursively trimmed from array values.

Functions

• Parameters prefixed with a single asterisk (*) denote that a variable number of positional arguments can be passed.
• Parameters prefixed with a double asterisk (**) denote that a variable number of named arguments can be passed.
• All keyword argument names are case-sensitive.
• All string arguments support the following escape sequences:

\s for spaces

\n for newlines

\\ for backslashes

The extension defines the following parser functions, Lua functions, Semantic MediaWiki result formats, Cargo display formats and magic words:

Construct an array or value

Name	Description
#af_bool	Cast a string to a boolean.
#af_float	Cast a string to a float.
#af_int	Cast a string to an integer.
#af_list	Create a new list from values.
#af_object	Create a new object from values.
#af_range	Create a finite range of integers.
#af_split	Split a string based on a delimiter.
AF_EMPTY	The empty array.
mw.af.export	Create a new array from Lua.
arrayfunctions	Format a Semantic MediaWiki query result as an ArrayFunctions array.
arrayfunctions	Display a Cargo query result as an ArrayFunctions array.

Extract information from an array

Name	Description
#af_count	Count the number of values in an array.
#af_exists	Check whether a key or index exists in an array.
#af_get	Retrieve an element from an array by index.
#af_isarray	Check if a value is an array.
#af_print	Print an array for debug purposes.
#af_search	Searches an array for a value.
#af_show	Show a value in a human-readable format.
mw.af.import	Create a new table from an ArrayFunctions array.

Create an array from an existing array

Name	Description
#af_difference	Compute the difference between arrays.
#af_filter	Filter element from an array.
#af_flatten	Flatten an array.
#af_group	Compute an array that when indexed yields all elements of a key from all subarrays.
#af_intersect	Compute the intersection of arrays.
#af_keysort	Sort a list of objects based on the values of a key.
#af_ksort	Sort an array by key.
#af_merge	Compute the union of arrays.
#af_push	Add a value to the end of a list.
#af_put	Set a value at an index.
#af_reverse	Reverse an array.
#af_set	Set a value at an index (deprecated in 1.13.0).
#af_slice	Extract a slice from an array.
#af_sort	Sort a list.
#af_unique	Remove duplicates from an array.
#af_unset	Remove a value from an array by index.
#af_zip	Zip two or more arrays together.

Iterate over an array

Name	Description
#af_foreach	Iterate over an array.
#af_join	Recursively join the items of an array together with a separator.
#af_map	Apply a callback to each element of a list.
#af_reduce	Iteratively reduce the array to a single value using a callback.

Miscellaneous functions

Name	Description
#af_if	Select one of two alternatives based on a predicate.
#af_pipeline	Create a pipeline of functions.
#af_stringmap	Apply a callback to each value in a delimited string.
#af_template	Invoke a template with the values in an array.
#af_trim	Trim characters at the start and end of a string.

af_bool

ArrayFunctions version

≥ 1.0

This parser function casts a string to a boolean. This is useful for creating an array containing a boolean. The values that are considered as true are "1", "true", "on", and "yes". The values that are considered as false are "0", "false", "off", and "no". If any other value is given, an error will be returned.

Description

{{#af_bool: value }}

Parameters

Name	Type	Description
value	string or boolean	The value to cast to a boolean.

Return values

Returns the casted boolean.

Examples

Create an opaque representation of a boolean	{{#af_bool: yes }}, {{#af_bool: no }}, {{#af_bool: true }}	boolean__^__1, boolean__^__0, boolean__^__1
Create an array containing a boolean	{{#af_print: {{#af_list: {{#af_bool: yes}} }} }}	0: true

af_count

ArrayFunctions version

≥ 1.0

This parser functions counts the number of values in an array. By default, this parser function only counts the number of top-level elements. However, if the keyword argument recursive is given a true value, it will also count the number of items in any sub-arrays. Note that in case of recursive=true, both the element containing an array, as well as all values inside the array are counted.

Description

{{#af_count: array | recursive=recursive }}

Parameters

Name	Type	Default	Description
array	array		The array to count.
recursive	boolean	false	Whether to count items recursively.

Return values

The number of items in the array.

Examples

Count the number of items in a one-dimensional list	{{#af_print: {{#af_count: {{#af_list: a | b | c }} }} }}	3
Count the number of items in a multi-dimensional list	{{#af_print: {{#af_count: {{#af_list: {{#af_list: a | b }} | {{#af_list: c | d }} }} }} }}	2
Recursively count the number of items in a multi-dimensional list	{{#af_print: {{#af_count: {{#af_list: {{#af_list: a | b }} | {{#af_list: c | d }} }} | recursive=true }} }}	6

af_difference

ArrayFunctions version

≥ 1.5

The difference between three arrays

This parser function computes the difference between arrays. This function preserves keys.

Description

{{#af_difference: array | *arrays }}

Parameters

Name	Type	Description
array	array	The first array.
*arrays	array	The other arrays.

Return values

Returns an array containing all values from array that are not present in any of the arrays in arrays. The keys in array are preserved.

Examples

Compute the difference of three arrays

{{#af_print: {{#af_difference: {{#af_list: a | b | c }} | {{#af_list: a }} | {{#af_list: b}} }} }}

2: c

af_exists

ArrayFunctions version

≥ 1.0

This parser function checks whether the given key or index exists in the given array. Multiple keys can be given to check nested arrays.

Description

{{#af_exists: array | *keys }}

Parameters

Name	Type	Description
array	array	The array to check.
keys	string or int	The key to check. Multiple keys can be given to check if a nested key exists.

Return values

Returns true if array contains the key, false otherwise.

Examples

Check if a key exists	{{#af_print: {{#af_exists: {{#af_object: hello=world }} | hello }} }}	true
Check if an index exists	{{#af_print: {{#af_exists: {{#af_list: a | b | c }} | 2 }} }}	true
Check if a nested key exists	{{#af_print: {{#af_exists: {{#af_list: a | {{#af_list: b | c }} }} | 0 | 3 }} }}	false

af_filter

ArrayFunctions version

≥ 2.0

This parser function filters elements from an array based on a condition. The condition is evaluated for each element in the array, and if the condition returns a "falsy" value, the element will be removed. Otherwise, the element will be kept. The values that are considered "falsy" are:

• The empty string;
• The boolean false;
• The strings "no", "off", "false" and "0".

If no condition is given, all empty elements are removed. Indices are not reset after calling this function.

Description

{{#af_filter: array | value_name | condition }}

Parameters

Name	Type	Default	Description
array	array		The array to filter.
value_name	string	null	The name to give to the value in the condition.
condition	string	null	The condition to filter on.

Return values

Returns the array with all values for which the condition returned a falsy value removed.

Examples

Remove all empty values	{{#af_print: {{#af_filter: {{#af_list: a | | c }} }} }}	0: a 2: c
Remove the element "b"	{{#af_print: {{#af_filter: {{#af_list: a | b | c }} | v | {{#ifeq: {{{v}}} | b | yes }} }} }}	0: a 2: c

af_flatten

ArrayFunctions version

≥ 1.11

This parser function creates a new array with all sub-array elements concatenated into it recursively up to the specified depth, or until it is completely flattened if no depth is specified.

Description

{{#af_flatten: array | depth }}

Parameters

Name	Type	Default	Description
array	array		The array to flatten.
depth	integer	null	The depth to flatten to, or nothing to flatten until the array is completely flat.

Return values

Returns an array with all sub-array elements concatenated into it recursively up to the specified depth, or a completely flattened array if no depth is specified.

Examples

Flatten an array one level deep

{{#af_print: {{#af_flatten: {{#af_list: {{#af_list: a | b | c }} | {{#af_list: d | e | f }} }} }} }}

0: a 1: b 2: c 3: d 4: e 5: f

af_float

ArrayFunctions version

≥ 1.0

This parser function casts a string to a float. This is useful for creating an array containing a float.

Description

{{#af_float: value }}

Parameters

Name	Type	Description
value	string or float	The value to cast to a float.

Return values

Returns the casted float.

Examples

Create an opaque representation of a float	{{#af_float: 1.298 }}, {{#af_float: 0 }}	float__^__1.298, float__^__0
Create an array containing a float	{{#af_print: {{#af_list: {{#af_float: 1.298 }} }} }}	0: 1.298

af_foreach

ArrayFunctions version

≥ 1.0

This parser function provides a way to iterate over arrays. For each of the elements in the given input array, it will evaluate its body, replacing any occurences of the key_name and value_name variables. These variables can be accessed in the same manner as template parameters, by surrounding them with triple braces (e.g. {{{value_name}}}).

The behaviour of this parser function might be influenced by the $wgArrayFunctionsForeachIterationLimit configuration parameter.

Description

{{#af_foreach: array | key_name | value_name | body | delimiter=delimiter }}

Parameters

Name	Type	Default	Description
array	array		The array over which to iterate.
key_name	string	null	The name to use for the key.
value_name	string	null	The name to use for the value.
body	string		The body to return for each iteration.
delimiter	string	""	The delimiter to put between results (available since version 1.9.0).

Return values

Returns the resulting wikitext.

Examples

Iterate over a list	{{#af_foreach: {{#af_list: John | Steve | Harry }} | | name | Hello, {{{name}}}!<br/> }}	Hello, John! Hello, Steve! Hello, Harry!
Iterate over an object	{{#af_foreach: {{#af_object: Hello=John | Hi=Steve | Welcome=Harry }} | greeting | name | {{{greeting}}}, {{{name}}}!<br/> }}	Hello, John! Hi, Steve! Welcome, Harry!
Iterate over a list and add a delimiter	{{#af_foreach: {{#af_list: John | Steve | Harry }} | | name | Hello, {{{name}}}! | delimiter=<br/> }}	Hello, John! Hello, Steve! Hello, Harry!

af_get

ArrayFunctions version

≥ 1.0

This parser function retrieves the element with the given index from the given array, or performs some operation if the index is overloaded. If the index does not exist and it is not an overloaded index, the empty string is returned.

An overloaded index allows the user to succinctly perform certain simple operations on arrays during indexing. Using an overloaded index is identical to first performing an #af_get with all indices before the overloaded index, then performing the function specified by the overloaded index, and then performing another #af_get with the remaining indices. For example, {{#af_get: {{{1}}} | a | * | b }} is equivalent to {{#af_get: {{#af_group: {{#af_get: {{{1}}} | a }} }} | b }}.

If the array contains a key that clashes with the symbol for an overloaded index, the value under the key will be retrieved instead. This was done for backwards compatibility reasons.

Description

{{#af_get: array | *indices }}

Parameters

Name	Type	Description
array	array	The array in which to index.
*indices	string	The index. Multiple indices can be given to index nested arrays.

Overloaded indices (available since version 1.11.0)

Syntax	Equivalent function	Description
*	#af_group	Group subarrays together by key.
<-	#af_reverse	Reverse the array.
><	#af_flatten	Flatten the array once.
>><<	#af_flatten	Flatten the array until it is completely flat.
#	#af_unique	Remove duplicates from the array.
n..m	#af_slice	Retrieve a slice of the array (either n or m can be omitted to index from the start up to the end of the array respectively).
! (available since version 1.16.0)	#af_show	Show the value in a human-readable way using format table, simple.
// (available since version 2.0.0)	#af_filter	Remove all empty elements from the array.

Return values

Returns the indexed value, or the empty string if the index does not exist.

Examples

Get a top-level element	{{#af_get: {{#af_list: a | b | c }} | 1 }}	b
Get a subarray	{{#af_print: {{#af_get: {{#af_list: a | {{#af_list: b | c }} }} | 1 }} }}	0: b 1: c
Get a nested element	{{#af_get: {{#af_list: a | {{#af_object: hello=world }} }} | 1 | hello }}	world
Reverse the array	{{#af_print: {{#af_get: {{#af_list: a | b | c }} | <- }} }}	0: c 1: b 2: a
Retrieve the last element of the array	{{#af_print: {{#af_get: {{#af_list: a | b | c }} | <- | 0 }} }}	c

af_group

ArrayFunctions version

≥ 1.11

This parser function computes an array where subarrays are recursively grouped together by key.

Description

{{#af_group: array }}

Parameters

Name	Type	Description
array	array	The array for which to group subarrays together.

Return values

Returns an array where subarrays are recursively grouped together by key.

Examples

Group subarrays by key

{{#af_print: {{#af_group: {{#af_list: {{#af_object: a=1 | b=2 }} | {{#af_object: a=3 | b=4 }} | {{#af_object: a=5 | b=5 }} }} }} }}

a 0: 1 1: 3 2: 5 b 0: 2 1: 4 2: 5

af_if

ArrayFunctions version

≥ 1.0

This parser function selects one of two alternatives based on the given predicate.

Description

{{#af_if: predicate | consequent | alternative }}

Parameters

Name	Type	Default	Description
predicate	boolean		The predicate.
consequent	string		The value to return if the predicate holds (i.e. is true).
alternative	string	""	The value to return if the predicate does not hold (i.e. is false).

Return values

Returns the consequent if the predicate holds, or the alternative if it is given and the predicate does not hold.

Examples

Check if a value is an array

{{#af_if: {{#af_isarray: not an array }} | A beautiful array! | Not an array! }}

Not an array!

af_int

ArrayFunctions version

≥ 1.0

This parser function casts a string to an integer. This is useful for creating an array containing an integer.

Description

{{#af_int: value }}

Parameters

Name	Type	Description
value	string or int	The value to cast to an integer.

Return values

Returns the casted integer.

Examples

Create an opaque representation of an integer	{{#af_int: 42 }}, {{#af_int: -12 }}	integer__^__42, integer__^__-12
Create an array containing an integer	{{#af_print: {{#af_list: {{#af_int: -129}} }} }}	0: -129

af_intersect

ArrayFunctions version

≥ 1.2

The intersection of three arrays

This parser function computes the intersection of arrays. This function preserves keys.

Description

{{#af_intersect: array | *arrays }}

Parameters

Name	Type	Description
array	array	The first array.
*arrays	array	The other arrays.

Return values

Returns the intersection of the given arrays.

Examples

Compute the intersection of two identical arrays	{{#af_print: {{#af_intersect: {{#af_list: a | b | c }} | {{#af_list: a | b | c }} }} }}	0: a 1: b 2: c
Compute the intersection of two partially overlapping arrays	{{#af_print: {{#af_intersect: {{#af_list: a | b | c }} | {{#af_list: c | d | e }} }} }}	2: c

af_isarray

ArrayFunctions version

≥ 1.0

This parser function checks if the given value is an array.

Description

{{#af_isarray: value }}

Parameters

Name	Type	Description
value	mixed	The value to check.

Return values

Returns true if value is an array, false otherwise.

Examples

Check if an array is an array	{{#af_print: {{#af_isarray: {{#af_list: a | b | c }} }} }}	true
Check if a string is an array	{{#af_print: {{#af_isarray: Hello, World! }} }}	false

af_join

ArrayFunctions version

≥ 1.0

This parser function recursively joins the items of an array together with a given separator.

Description

{{#af_join: array | glue }}

Parameters

Name	Type	Default	Description
array	array		The array to join.
glue	string	""	The string used to join each item.

Return values

Returns the joined array.

Examples

Join a one-dimensional array	{{#af_join: {{#af_list: a | b | c }} }}	abc
Join a one-dimensional array using a separator	{{#af_join: {{#af_list: a | b | c }} | \s-\s }}	a - b - c
Join a multi-dimensional array using a separator	{{#af_join: {{#af_list: a | b | {{#af_list: c | d }} }} | \s-\s }}	a - b - c - d

af_keysort

ArrayFunctions version

≥ 1.0

This parser function sorts a list of objects based on the values of the specified key. To sort an array by key, use #af_ksort.

Description

{{#af_keysort: array | key | descending=descending | caseinsensitive=caseinsensitive }}

Parameters

Name	Type	Default	Description
array	array		The array to sort.
key	string		The key of the values on which the sort should be based.
descending	boolean	false	Whether to sort in a descending order.
caseinsensitive	boolean	false	Whether to ignore case when sorting (available since version 1.7.0).

Return values

Returns the sorted array.

Examples

Sort based on age	{{#af_print: {{#af_keysort: {{#af_list: {{#af_object: name=John | age=56 }} | {{#af_object: name=Harry | age=12 }} | {{#af_object: name=Bob | age=24 }} }} | age }} }}	0 name: Harry age: 12 1 name: Bob age: 24 2 name: John age: 56
Sort based on age, in descending order	{{#af_print: {{#af_keysort: {{#af_list: {{#af_object: name=John | age=56 }} | {{#af_object: name=Harry | age=12 }} | {{#af_object: name=Bob | age=24 }} }} | age | descending=true }} }}	0 name: John age: 56 1 name: Bob age: 24 2 name: Harry age: 12

af_ksort

ArrayFunctions version

≥ 1.7

This parser function sorts an array by key.

Description

{{#af_ksort: array | descending=descending | caseinsensitive=caseinsensitive }}

Parameters

Name	Type	Default	Description
array	array		The array to sort.
descending	boolean	false	Whether to sort in a descending order.
caseinsensitive	boolean	false	Whether to ignore case when sorting (available since version 1.7.0).

Return values

Returns the sorted array.

Examples

Sort by key

{{#af_print: {{#af_ksort: {{#af_object: c=banana | a=orange | b=apple }} }} }}

a: orange b: apple c: banana

af_list

ArrayFunctions version

≥ 1.0

This parser function creates a new list from the given parameters.

Description

{{#af_list: *values }}

Parameters

*values : mixed

The values for the list.

Return values

Returns the resulting list.

Examples

Create a simple one-dimensional list	{{#af_print: {{#af_list: a | b | c }} }}	0: a 1: b 2: c
Create a multi-dimensional list	{{#af_print: {{#af_list: {{#af_list: a | b }} | {{#af_list: c | d }} }} }}	0 0: a 1: b 1 0: c 1: d
Create a list of objects	{{#af_print: {{#af_list: {{#af_object: name=Harry | age=22 }} | {{#af_object: name=Bobby | age=29 }} }} }}	0 name: Harry age: 22 1 name: Bobby age: 29

af_map

ArrayFunctions version

≥ 1.0

This parser function applies a callback to each element of a list.

Description

{{#af_map: array | value_name | callback }}

Parameters

array : array

The array to run through the callback.

value_name : string

The name to give to the value in the callback.

callback : string

The callback to apply to each element of the array.

Return values

Returns the resulting mapped array.

Examples

Appending a string to each element	{{#af_print: {{#af_map: {{#af_list: a | b | c }} | v | {{{v}}}-appended }} }}	0: a-appended 1: b-appended 2: c-appended
Altering list elements	{{#af_print: {{#af_map: {{#af_list: {{#af_list: a }} | {{#af_list: b }} }} | v | {{#af_push: {{{v}}} | c }} }} }}	0 0: a 1: c 1 0: b 1: c

af_merge

ArrayFunctions version

≥ 1.2

This parser function computes the merges two or more arrays. It merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one. It does not remove duplicates.

If the input arrays have the same string key, then the later value for that key will overwrite the previous one. If the arrays contain numeric keys, later values will be appended instead and the later keys will be renumbered.

Description

{{#af_merge: array | *arrays }}

Parameters

array : array

The first array.

*arrays : array

The other arrays.

Return values

Returns the union of the given arrays.

Examples

Appending a string to each element

{{#af_print: {{#af_merge: {{#af_list: a | b | c }} | {{#af_list: d | e | f }} }} }}

0: a 1: b 2: c 3: d 4: e 5: f

af_object

ArrayFunctions version

≥ 1.0

This parser function creates a new object from the given parameters.

Description

{{#af_object: **values }}

Parameters

**values : mixed

The values for the object.

Return values

Returns the resulting object.

Examples

Create a simple one-dimensional object	{{#af_print: {{#af_object: a=b | b=c | c=d }} }}	a: b b: c c: d
Create a multi-dimensional object	{{#af_print: {{#af_object: head={{#af_object: title=MediaWiki | meta={{#af_list: {{#af_object: charset=UTF-8 }} }} }} }} }}	head title: MediaWiki meta 0 charset: UTF-8

af_pipeline

ArrayFunctions version

≥ 1.14

This parser function creates a pipeline of operations. The parser function takes the result from expanding the previous argument, and passes that as the specified parameter (or prev by default) to the next argument of the parser function. This is very useful to improve the readability of the template code, as it allows you to remove deeply nested parser function calls. For example, the following two snippets are semantically equivalent:

Before	After
{{#af_print: {{#af_unique: {{#af_reverse: {{#af_list: a | a | b | c}} }} }} }}	{{#af_pipeline: {{#af_list: a | a | b | c }} | {{#af_reverse: {{{prev}}} }} | {{#af_unique: {{{prev}}} }} | {{#af_print: {{{prev}}} }} }}

The behaviour of this parser function might be influenced by the $wgArrayFunctionsMaxPipelineLength configuration parameter.

Description

{{#af_pipeline: initial | *steps | parameter=parameter }}

Parameters

Name	Type	Default	Description
initial	mixed		The initial value of the pipeline.
*steps	mixed		The subsequent steps of the pipeline.
parameter	string	"prev"	The name to use for the previous value.

Return values

Returns the value returned by the final step of the pipeline.

Examples

Create a pipeline

{{#af_pipeline: {{#af_list: a | a | b | c }} | {{#af_reverse: {{{prev}}} }} | {{#af_unique: {{{prev}}} }} | {{#af_print: {{{prev}}} }} }}

0: c 1: b 2: a

af_print

ArrayFunctions version

≥ 1.0

This parser function prints the given value for debug purposes. Unlike #af_show, it does not parse the value. This function should only be used for debug purposes, consider using #af_show to display a value to the reader.

Description

{{#af_print: *values | end=end }}

Parameters

Name	Type	Default	Description
*values	mixed		The values to print.
end	string	""	The string to append to the end of each printed value.

Return values

Returns the value in human-readable form.

Examples

Print a boolean	{{#af_print: {{#af_bool: yes }} }}	true
Print a list	{{#af_print: {{#af_list: a | b | c }} }}	0: a 1: b 2: c

af_push

ArrayFunctions version

≥ 1.0

This parser function adds the given value to the end of the list.

Description

{{#af_push: array | value }}

Parameters

array : array

The array to append the value to.

value : mixed

The value to add.

Return values

Returns the array with the value appended.

Examples

Push a value

{{#af_print: {{#af_push: {{#af_list: a | b }} | c }} }}

0: a 1: b 2: c

af_put

ArrayFunctions version

≥ 1.13

This parser function sets the given value for the given index. It is identical to #af_set, except for the parameter order. This parser function should be preferred over #af_set.

Description

{{#af_put: array | value | *indices }}

Parameters

array : array

To array in which to set the index.

value : mixed

The value to set the index to.

*indices : string

The index to set. Multiple indices can be given to index nested arrays.

Return values

Returns the array with the given index set to the given value.

Examples

Replace an existing value	{{#af_print: {{#af_put: {{#af_list: a | b | c }} | d | 2 }} }}	0: a 1: b 2: d
Create a new index	{{#af_print: {{#af_set: {{#af_object: foo=bar }} | far | boo }} }}	foo: bar boo: far
Create a new subarray	{{#af_print: {{#af_set: {{#af_object: foo=bar }} | far | boo | far }} }}	foo: bar boo far: far

af_range

ArrayFunctions version

≥ 1.12

This parser function creates a finite range of integers. The ith element of a range is determined by the function r(i) = start + step * i. For a positive step, the bounds of the range are i >= 0 and r(i) < stop. For a negative step, the bounds are i >= 0 and r(i) > stop.

The behaviour of this parser function might be influenced by the $wgArrayFunctionsMaxRangeSize configuration parameter.

Description

{{#af_range: start | stop | step }}

Parameters

Name	Type	Default	Description
start	integer		The start of the range.
stop	integer	null	The end of the range (non-inclusive). If this value is omitted, the start will become the stop, and start will default to zero.
step	integer	1	The step size between range values.

Return values

A finite range of integers.

Examples

Create a range from 0 to 4	{{#af_print: {{#af_range: 0 | 5 }} }}	0: 0 1: 1 2: 2 3: 3 4: 4
Alternative syntax for a range from 0 to 4	{{#af_print: {{#af_range: 5 }} }}	0: 0 1: 1 2: 2 3: 3 4: 4
Create a range from 0 to -4	{{#af_print: {{#af_range: 0 | -5 | -1 }} }}	0: 0 1: -1 2: -2 3: -3 4: -4
Create a range of all odd numbers between 0 to 10	{{#af_print: {{#af_range: 1 | 10 | 2 }} }}	0: 0 1: 3 2: 5 3: 7 4: 9

af_reduce

ArrayFunctions version

≥ 1.2

This parser function iteratively reduces the array to a single value using a callback. It iteratively applies callable to the elements of the given array, so as to reduce the array to a single value. The callable is passed the value of the current iteration, as well as the result of the previous iteration.

Description

{{#af_reduce: array | carry_name | value_name | callable | initial }}

Parameters

Name	Type	Default	Description
array	array		The array to reduce.
carry_name	string		The name to use for the carry.
value_name	string		The name to use for the value.
callable	string		The callback to use for each iteration.
initial	string	""	The initial carry to use.

Return values

Returns the resulting value.

Examples

Using reduction to concatenate values	{{#af_reduce: {{#af_list: a | b | c }} | c | i | {{{c}}}{{{i}}} }}	abc
Using reduction to reverse and then concatenate values	{{#af_reduce: {{#af_list: a | b | c }} | c | i | {{{i}}}{{{c}}} }}	cba
Using reduction to build an equation	{{#af_reduce: {{#af_list: 2 | 3 | 5 | 7 | 11 }} | c | i | {{{c}}} + {{{i}}} | 0 }}	0 + 2 + 3 + 5 + 7 + 11

af_reverse

ArrayFunctions version

≥ 1.11

This parser function reverses the given array. It does not preserve numeric keys.

Description

{{#af_reverse: array }}

Parameters

array : array

The array to reverse.

Return values

Returns the original array reversed.

Examples

Reverse a list

{{#af_print: {{#af_reverse: {{#af_list: a | b | c}} }} }}

0: c 1: b 2: a

af_search

ArrayFunctions version

≥ 1.3

This parser function searches the given array for the given value, and returns the first corresponding key if the value is found.

Description

{{#af_search: array | value }}

Parameters

array : array

The array to search in.

value : mixed

The value to search for.

Return values

Returns the first corresponding key if the value is found, nothing otherwise.

Examples

Search for a value in an array

{{#af_print: {{#af_search: {{#af_list: a | b | c }} | b }} }}

1

af_set

ArrayFunctions version

≥ 1.0

(deprecated in 1.13.0)

This parser function sets the given value for the given index. It has been deprecated in ArrayFunctions 1.13.0, and should no longer be used. It will remain available indefinitely for backwards compatibility. As an alternative, you should use #af_put instead.

Description

{{#af_set: value | array | *indices }}

Parameters

value : mixed

The value to set the index to.

array : array

To array in which to set the index.

*indices : string

The index to set. Multiple indices can be given to index nested arrays.

Return values

Returns the array with the given index set to the given value.

Examples

Replace an existing value	{{#af_print: {{#af_set: d | {{#af_list: a | b | c }} | 2 }} }}	0: a 1: b 2: d
Create a new index	{{#af_print: {{#af_set: far | {{#af_object: foo=bar }} | boo }} }}	foo: bar boo: far
Create a new subarray	{{#af_print: {{#af_set: far | {{#af_object: foo=bar }} | boo | far }} }}	foo: bar boo far: far

af_show

ArrayFunctions version

≥ 1.4

This parser function prints the given value in a human-readable format. The formatting of the value is based on format.

Description

{{#af_show: value | format=format }}

Parameters

Name	Type	Default	Description
value	mixed		The value to show.
format	string	"simple"	(introduced in 1.16.0) A comma-separated list of formats. The value will be shown using the first format supporting the type of the value.

Formats (available since version 1.16.0)

Name	Supported types	Description
simple	string, integer, float, boolean	Format the value as its string representation. This is the default format.
table	array	Format the value as a table.

Return values

Returns the value in human-readable form, formatted using format.

Examples

Show a value	{{#af_show: Hello World! }}	Hello World!
Show an integer	{{#af_show: {{#af_int: 42 }} | format=simple }}	42

af_slice

ArrayFunctions version

≥ 1.0

This parser function extracts a slice from the given array. Keys will be reset and reordered.

Description

{{#af_slice: array | offset | length }}

Parameters

Name	Type	Required?	Description
array	array	Required	The array to take a slice from.
offset	integer	Required	The offset at which the slice starts. If non-negative, the slice will start at this given offset. If negative, the sequence will start that far from the end of the array.
length	integer	Optional	The length of the slice. If the length is given and positive, then the slice will have that many elements in it. If the length is given and negative, then the slice will stop that many elements from the end of the array. If it is omitted, then the slice will have everything from offset up until the end of the array.

Return values

The slice.

Examples

Get the first two elements	{{#af_print: {{#af_slice: {{#af_list: a | b | c }} | 0 | 2 }} }}	0: a 1: b
Get the last element	{{#af_print: {{#af_slice: {{#af_list: a | b | c }} | -1 }} }}	0: c

af_sort

ArrayFunctions version

≥ 1.0

This parser function sorts the given list. It does not preserve numeric keys.

Description

{{#af_sort: array | descending=descending | caseinsensitive=caseinsensitive }}

Parameters

Name	Type	Default	Description
array	array		The array to sort.
descending	boolean	false	Whether to sort the list in descending order.
caseinsensitive	boolean	false	Whether to ignore case when sorting.

Return values

Returns the sorted list.

Examples

Sort a list in ascending order	{{#af_print: {{#af_sort: {{#af_list: b | c | a }} }} }}	0: a 1: b 2: c
Sort a list in descending order	{{#af_print: {{#af_sort: {{#af_list: b | c | a }} | descending=true }} }}	0: c 1: b 2: a

af_split

ArrayFunctions version

≥ 1.1

This parser function splits the given string based on a delimiter.

Description

{{#af_split: string | delimiter }}

Parameters

Name	Type	Default	Description
string	string		The string to split.
delimiter	string	","	The delimiter to use.

Return values

Returns the resulting list.

Examples

Split a string based on commas	{{#af_print: {{#af_split: a, b, c }} }}	0: a 1: b 2: c
Split a sentence into words	{{#af_print: {{#af_split: Lorem ipsum dolor et | \s }} }}	0: Lorem 1: ipsum 2: dolor 3: et

af_stringmap

ArrayFunctions version

≥ 1.6

This parser function applies a callback to each item of a delimited string, and returns the result as a delimited string, optionally with a different delimiter. This function is similar to Page Forms' #arraymap parser function.

Description

{{#af_stringmap: value | delimiter | value_name | callback | new_delimiter | conjunction }}

Parameters

Name	Type	Default	Description
value	string		The delimited string.
delimiter	string		The delimiter to split value on. If the empty string is given, "," is used.
value_name	string		The name to give to the value in the callback.
callback	string		The callback to apply to each element of the array.
new_delimiter	string	", "	The new delimiter to insert in between the mapped items.
conjunction	string	null	The delimiter to place between the last two items. This allows you to create a more natural summation, such as "Alice, Bob and Eve". If no value is given, the value of new_delimiter is used.

Return values

Returns the resulting delimited string.

Examples

Turn each item into a link	{{#af_stringmap: William Shakespeare, Stephen King, Mark Twain | , | x | [[{{{x}}}]] }}	William Shakespeare, Stephen King, Mark Twain
Turn a comma-separated list into a human-readable list	{{#af_stringmap: William Shakespeare, Stephen King, Mark Twain | , | x | {{{x}}} | ,\s | and }}	William Shakespeare, Stephen King and Mark Twain

af_template

ArrayFunctions version

≥ 1.0

This parser function will invoke the given template and pass the values in the given array as arguments. In case the given array is an object, the values will be passed as named arguments. Otherwise, they will be passed as numeric arguments.

Description

{{#af_template: name | data }}

Parameters

name : string

The name of the template to invoke. If no namespace is given, it is assumed the page is in the template namespace, otherwise the given namespace is used. The page must exist, must be includable and must be readable by the user, otherwise an error is given.

data : array

The data to pass to the parameters. Values with numeric indices are passed as positional arguments and values with string indices are passed as named arguments.

Return values

The expanded template.

Examples

Invoking a template with a list	{{#af_template: Echo | {{#af_list: a | b }} }}	{{Echo|a|b}}
Invoking a template with an object	{{#af_template: Echo | {{#af_object: foo=bar | boo=far }} }}	{{Echo|foo=bar|boo=far}}

af_trim

ArrayFunctions version

≥ 1.8

This parser function will trim the given characters from the beginning and the end of the given string. The order of the characters does not matter. It will stop once it hits a character that is not in characters.

Description

{{#af_trim: string | characters }}

Parameters

string : string

The string that will be trimmed.

characters : string

The characters to trim.

Return values

The trimmed string.

Examples

Trimming a string	{{#af_trim: !a! | ! }}	a
Trimming every string in a list	{{#af_print: {{#af_map: {{#af_list: !a! | !b! | !c! }} | v | {{#af_trim: {{{v}}} | ! }} }} }}	0: a 1: b 2: c

af_unique

ArrayFunctions version

≥ 1.0

This parser function removes duplicate values from the given array. This function does not reset keys.

Description

{{#af_unique: array }}

Parameters

array : array

The array from which to remove duplicates.

Return values

Returns the array with duplicates removed.

Examples

Remove duplicates from an array

{{#af_print: {{#af_unique: {{#af_list: a | a | b | c | b }} }} }}

0: a 2: b 3: c

af_unset

ArrayFunctions version

≥ 1.0

This parser function removes the value associated with the given index from the array and returns the result. Numeric keys are not reset after calling this function.

Description

{{#af_unset: array | *indices }}

Parameters

array : array

The array from which to remove the given key.

*indices : string

The index to remove. Multiple indices can be given to index nested arrays.

Return values

Returns the array with the given index removed.

Examples

Remove a top-level index	{{#af_print: {{#af_unset: {{#af_list: a | b | c }} | 2 }} }}	0: a 1: b
Remove a top-level index, keys not reset	{{#af_print: {{#af_unset: {{#af_list: a | b | c }} | 1 }} }}	0: a 2: c
Remove a nested index	{{#af_print: {{#af_unset: {{#af_object: foo={{#af_object: bar=quz | far=buz }} }} | foo | bar }} }}	foo far: buz

af_zip

ArrayFunctions version

≥ 1.16

This parser functions takes one or more arrays and zips these together by key, creating an array where each key maps to an array containing all values under that key in each of the input arrays. The final array will only contain keys that were present in all of the input arrays. This means that if an input array contains a key not present in one of the other input arrays, the key will be dropped, and it will not be part of the final zipped array.

Description

{{#af_zip: array | *arrays }}

Parameters

array : array

The first array.

*arrays : array

The other arrays.

Return values

Returns the arrays zipped together.

Examples

Zip two lists of equal length	{{#af_print: {{#af_zip: {{#af_list: a | b | c }} | {{#af_list: d | e | f }} }} }}	0 0: a 1: d 1 0: b 1: e 2 0: c 1: f
Zip two lists of different lengths	{{#af_print: {{#af_zip: {{#af_list: a | b }} | {{#af_list: d | e | f }} }} }}	0 0: a 1: d 1 0: b 1: e
Zip two objects with the same keys	{{#af_print: {{#af_zip: {{#af_object: a=a | b=b }} | {{#af_object: a=c | b=d }} }} }}	a 0: a 1: c b 0: b 1: d
Zip two objects with different keys	{{#af_print: {{#af_zip: {{#af_object: a=a | b=b }} | {{#af_object: a=c | different=d }} }} }}	a 0: a 1: c

Scribunto

It is recommended to use LuaSandbox , because the order of arrays is not preserved when using LuaStandalone (see T349590).

This extension is particularly useful in combination with Lua, as it can be used to create the array containing data required for the presentation of the page. This array can be exported to work with ArrayFunctions:

local p = {};

function p.world()
	return mw.af.export({
		["Hello"] = "World"
	});
end

return p;

This module may then be invoked like so:

{{#af_print: {{#invoke: Hello | world }} }}

Hello: World

mw.af.export

ArrayFunctions version

≥ 1.0

This Lua function exports a Lua table as an ArrayFunctions array.

Description

mw.af.export( table )

Parameters

table : array

The array to export.

Return values

Returns the table as an ArrayFunctions array.

mw.af.import

ArrayFunctions version

≥ 1.6

This Lua function imports an ArrayFunctions array as a Lua table.

Description

mw.af.import( array )

Parameters

array : array

The array to import.

Return values

Returns the array as a Lua table.

Semantic MediaWiki

This extension integrates with Semantic MediaWiki by adding the arrayfunctions result format. The arrayfunctions result format is used to format query results as an ArrayFunctions array. The result is almost identical to the result of Semantic Scribunto's mw.smw.ask Lua function, except numeric indices start at zero.

arrayfunctions

ArrayFunctions version

≥ 1.14

This result format formats query results as an ArrayFunctions array.

Description

{{#ask: query | format=arrayfunctions }}

Return values

Returns the query result as an ArrayFunctions array.

Examples

Simple query

{{#af_print: {{#ask: [[Category:City]] [[Located in::Germany]] |?Population |?Area#km²=Size |mainlabel=City |sort=Population |order=descending |headers=plain |format=arrayfunctions }} }}

0 City: Berlin Population: 3520061 Size: 891.85 km² 1 City: Munich Population: 1353186 Size: 310.43 km² 2 City: Cologne Population: 1080394 Size: 405.02 km² 3 City: Frankfurt Population: 679664 Size: 248.31 km² 4 City: Stuttgart Population: 606588 Size: 207.35 km² 5 City: Würzburg Population: 126635 Size: 87.63 km²

Cargo

This extension integrates with Cargo by adding the arrayfunctions display format. The arrayfunctions result format is used to format query results as an ArrayFunctions array.

arrayfunctions

ArrayFunctions version

≥ 1.15

This display format formats query results as an ArrayFunctions array.

Description

The no html parameter is required for ArrayFunctions to interpret the result correctly.

{{#cargo_query: parameters | no html | format=arrayfunctions }}

Return values

Returns the query result as an ArrayFunctions array.

Examples

Simple query

{{#af_print: {{#cargo_query: tables=Books |no html |fields=_pageName,Authors,Genres |format=arrayfunctions }} }}

0 _pageName: The Masque of the Red Death Authors: Edgar Allan Poe Genres 0: Horror 1: Fiction 1 _pageName: Rita Hayworth and Shawshank Redemption Authors: Stephen King Genres 0: Realism 1: Crime 2 _pageName: Animal Farm Authors: George Orwell Genres: Political satire

Magic words

The extension defines a number of magic words (variables).

AF_EMPTY

ArrayFunctions version

≥ 1.0

This magic word returns the empty array. This is useful, because it is not possible to create an empty array with #af_list or #af_object.

Description

{{AF_EMPTY}}

Return values

Returns the empty array.

Presentations

• 
  Presentation at SMWCon 2022 talking about ArrayFunctions
• 
  Presentation at EMWCon 2023 talking about ArrayFunctions
• 
  Workshop given at SMWCon 2023 about making your wiki Parsoid-compatible
• 
  Presentation at SMWCon 2023 talking about Parsoid and ArrayFunctions
• 
  Presentation at the MUD Workshop Spring 2025 about ArrayFunctions

See also

• Extension:Arrays – similar extension that works by first defining and then manipulating arrays. Incompatible with Parsoid.
• Extension:Scribunto – allows you to embed Lua scripts into wikipages.

Changelog

All notable changes to ArrayFunctions will be documented here.

The format is based on Keep a Changelog, and this extension adheres to Semantic Versioning.

v2.0.1 - 2026 June 18

Changed

• Make #af_stringmap able to create array with "0" as a value. Previously, "0" would be removed from the array.

v2.0.0 - 2026 January 28

Added

• Add the #af_filter parser function.
• Add the // overloaded index to remove empty values.

Changed

• BREAKING: Remove support for MediaWiki 1.39 and earlier. The oldest supported version is now MediaWiki 1.40.
• BREAKING: In #af_pipeline, when the first argument is empty, {{{prev}}} now renders literally as {{{prev}}}. Use {{{prev|}}} to preserve the 1.x.x behavior.
• Ignore the first argument when it is empty for #af_difference, #af_intersect, #af_merge, #af_object, #af_pipeline, and #af_zip.
• Localisation updates courtesy of translatewiki.net.

v1.17.0 - 2025 August 26

This version is not tagged properly on Special:Version, where it still shows as 1.16.2.

Added

• Add the $wgArrayFunctionsMaxPipelineLength configuration variable to limit the total number of steps in a pipeline.
• Add the Pages using the ArrayFunctions extension (af-tracking-category) tracking category.

Changed

• Localisation updates courtesy of translatewiki.net.

Fixed

• Ranges that exceed $wgArrayFunctionsMaxRangeSize are now taken into account when reporting the size of the largest constructed range in the parser limit report. Previously, only ranges that did not exceed the limit would be taken into account.
• Fix TypeError that occurred when an error was propagated from a nested parser function call.

v1.16.2 - 2025 June 28

Fixed

• Fix exception caused by storing a Message object in the parser's extension data (T397946).
• Ensure errors are rendered in the page's target language instead of the user's language (T397951).

v1.16.1 - 2025 June 19

Changed

• Localisation updates courtesy of translatewiki.net.

Fixed

• Fix BadMethodCallException that was caused by relying on $wgLang in the ParserLimitReportPrepare hook.

v1.16.0 - 2025 June 10

Added

• Add the $wgArrayFunctionsForeachIterationLimit configuration variable to limit the total number of iterations that can be performed by #af_foreach.
• Add the $wgArrayFunctionsMaxRangeSize configuration variable to limit the maximum number of elements that an array constructed using #af_range can contain.
• Add the #af_zip parser function.
• Add the ! overloaded index to show a value.
• Add the table and simple formats for `#af_show`.
• Add the Pages with ArrayFunctions errors (af-error-category) tracking category.
• Add error tracking and propagation.

Changed

• Allow #af_show to take a format.
• The #af_sort and #af_ksort parser functions now compare items normally instead of as strings.
• Localisation updates courtesy of translatewiki.net.

Fixed

• Fix exception when passing the empty string to a keyword argument.

v1.15.0 - 2025 May 13

Added

• Add the arrayfunctions Cargo display format.

Changed

• Localisation updates courtesy of translatewiki.net.

v1.14.2 - 2025 April 15

Fixed

• Remove properties without a value from the result when using the arrayfunctions result format with Semantic MediaWiki.

v1.14.1 - 2025 April 15

Added

• Add compatibility with Semantic MediaWiki 5.0.0.

Changed

• Localisation updates courtesy of translatewiki.net.

Fixed

• Restore compatibility with deprecated MediaWiki 1.35.

v1.14.0 - 2025 April 1

Added

• Add the arrayfunctions Semantic MediaWiki result format.
• Add the #af_pipeline parser function.

Changed

• Drop compatibility with MediaWiki 1.35.
• Localisation updates courtesy of translatewiki.net.

Fixed

• Fix exception when using #af_template on MediaWiki 1.44.

v1.13.0 - 2025 March 4

Changed

• Replace the #af_set parser function with #af_put. The #af_set parser function remains available for backwards compatibility.
• Localisation updates courtesy of translatewiki.net.

Fixed

• The magic variable IDs array is now no longer treated as associative, which would previously break CodeMirror syntax highlighting. (by alex4401)

v1.12.0 - 2025 February 4

Added

• Add the #af_range parser function.

Changed

• Rename the #af_wildcard parser function to #af_group, and add an alias for #af_wildcard.
• The #af_difference parser function now compares items normally instead of as strings.
• The #af_exists parser function now accepts multiple keys to check if a nested key exists.
• The #af_intersect parser function now compares items normally instead of as strings.
• Localisation updates courtesy of translatewiki.net.

v1.11.0 - 2024 December 10

Added

• Add following parser functions: #af_flatten #af_wildcard #af_reverse .
• Overload #af_get with special indices to perform certain operations on the array instead of retrieving a key.

Changed

• The #af_unique parser function now compares items normally instead of as strings.

v1.10.0 - 2024 November 26

Added

• Add ZLIB compression using gzdeflate and gzinflate.

Changed

• Localisation updates courtesy of translatewiki.net.

v1.9.0 - 2024 May 2

Added

• Add delimiter option to the #af_foreach parser function.

Changed

• All string parameters now support escape sequences.

v1.8.0 - 2024 April 4

Changed

• Whitespace is now trimmed from the beginning and the end of array values to be consistent with the behaviour of other parameters in MediaWiki.
• Localisation updates courtesy of translatewiki.net.

v1.7.0 - 2023 October 24

Added

• Add the #af_ksort parser function.
• Add caseinsensitive option to the #af_keysort parser function.
• Add caseinsensitive option to the #af_sort parser function.

Changed

• Localisation updates courtesy of translatewiki.net.

v1.6.0 - 2023 September 12

Added

• Add the #af_stringmap parser function.
• Add the mw.af.import Lua function to import ArrayFunctions arrays into Lua.

Changed

• Localisation updates courtesy of translatewiki.net.

v1.5.0 - 2023 September 7

Added

• Add the #af_difference parser function.

Changed

• Localisation updates courtesy of translatewiki.net.

v1.4.4 - 2023 June 30

Changed

• Localisation updates courtesy of translatewiki.net.

Fixed

• Fix #af_template parser function to no longer check a user their read permissions explicitly, as regular template transclusion also does not do this. Previously, an error would be outputted.

v1.4.3 - 2023 May 26

Changed

• Exporting a NULL value (e.g. through the mw.af.export Lua function) will now result in the empty string. Previously, the NULL would be returned unaltered.

v1.4.2 - 2023 May 26

Changed

• The #af_template parser function now shows non-existent templates as a broken link. Previously, an error would be outputted.
• Localisation updates courtesy of translatewiki.net.

v1.4.1 - 2023 May 5

Changed

• The #af_split parser function now allows the empty string as its first parameter. Previously, an error would be outputted.
• Localisation updates courtesy of translatewiki.net.

v1.4.0 - 2023 April 26

Added

• Add the #af_show parser function.

v1.3.0 - 2023 March 27

Added

• Add the #af_search parser function.

v1.2.0 - 2023 March 3

Added

• Add the following parser functions: #af_intersect #af_merge #af_reduce.

v1.1.0 - 2023 February 3

Added

• Add the #af_split parser function.

v1.0.1 - 2023 January 9

Changed

• The mw.af.export Lua function now supports parameters of all types. Previously, it only supported arrays.

Fixed

• Fix issue where an exception was thrown when a parameter with an incorrect type was passed to mw.af.export.

v1.0.0 - 2023 January 7

Added

• Add the parser functions: #af_bool #af_count #af_exists #af_float #af_foreach #af_get #af_if #af_int #af_isarray #af_join #af_keysort #af_list #af_map #af_object #af_print #af_push #af_set #af_slice #af_sort #af_template #af_unique #af_unset