Extension:ArrayFunctions
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 | 1.8.0 (2024-04-04) |
Compatibility policy | Master maintains backward compatibility. |
MediaWiki | >=1.35.6 |
PHP | >=7.4 |
Database changes | No |
Composer | wikibase-solutions/array-functions |
License | GNU General Public License 2.0 or later |
Download | |
Quarterly downloads | 14 (Ranked 124th) |
Translate the ArrayFunctions extension if it is available at translatewiki.net | |
Issues | Open tasks · Report a bug |
Documentation for past releases: 1.0 · 1.1 · 1.2 · 1.3 · 1.4 · 1.5 · 1.6 · 1.7
The ArrayFunctions extension creates an additional set of pure, Parsoid-compatible (see here) parser functions that perform operations on arrays. These parser functions are pure, meaning they do not modify any previously defined arrays and only return a result based on their input arguments.
Installation edit
- Download and move the extracted
ArrayFunctions
folder to yourextensions/
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' );
- Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.
FAQ edit
How can I define an array to be used throughout a page? edit
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 Parsoid/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? edit
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.
How to use foreach with a delimiter? edit
Using #af_foreach with a delimiter is not supported. Instead, you can use the #af_map function in conjunction with the #af_join function:
{{#af_join:{{#af_map:{{#af_list:red|green|blue}}|color|* {{{color}}} is my favourite.}}|\n}}
Why are values not recognized as arrays? edit
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? edit
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 simply outputs its result. For example, when calling #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 should be used to perform complex operations. For example:
{{#arraydefine: fruits | orange, banana, strawberry, apple }} {{#arraysort: fruits | asc }} {{#arrayprint: fruits }}
- ArrayFunctions
{{#af_print: {{#af_sort: {{#af_list: orange | banana | strawberry | apple }} }} }}
Functions edit
This section uses Python's notation for variadic parameters. A parameter prefixed with a single asterisk (*) denotes that a variable number of positional arguments can be passed, and a parameter prefixed with a double asterisk (**) denotes that a variable number of named arguments can be passed.
All keyword argument names are case-sensitive.
Available functions edit
The extension defines the following parser functions, Lua functions 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_split
|
Split a string based on a delimiter. |
AF_EMPTY
|
The empty array. |
mw.af.export
|
Create a new array from Lua. |
- 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_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_set
|
Set a value at an index. |
#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. |
- 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_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 edit
ArrayFunctions version | ≥ 1.0 |
This parser function casts a string to a boolean. This is useful for creating an array containing a boolean.
Description edit
{{#af_bool: value }}
Parameters edit
- value : string or boolean
- The value to cast to a boolean.
Return values edit
Returns the casted boolean.
Examples edit
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}} }} }} |
|
af_count edit
ArrayFunctions version | ≥ 1.0 |
This parser functions counts the number of values in an array.
Description edit
{{#af_count: array | recursive=recursive }}
Parameters edit
- array : array
- The array to count.
- recursive : boolean, default=false
- Whether to count items recursively. Note that elements containing a list are also counted (see examples below).
Return values edit
The number of items in the array.
Examples edit
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 edit
ArrayFunctions version | ≥ 1.5 |
This parser function computes the difference between arrays. This function preserves keys.
Description edit
{{#af_difference: array | *arrays }}
Parameters edit
- array : array
- The first array.
- *arrays : array
- The other arrays.
Return values edit
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 edit
Compute the difference of three arrays | {{#af_print: {{#af_difference: {{#af_list: a | b | c }} | {{#af_list: a }} | {{#af_list: b}} }} }} |
|
af_exists edit
ArrayFunctions version | ≥ 1.0 |
This parser function checks whether the given key or index exists in the given array.
Description edit
{{#af_exists: array | key }}
Parameters edit
- array : array
- The array to check.
- key : string or int
- The key to check.
Return values edit
Returns true if array
contains key
, false otherwise.
Examples edit
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_get: {{#af_list: a | {{#af_list: b | c }} }} | 1 }} | 2 }} }} |
false |
af_float edit
ArrayFunctions version | ≥ 1.0 |
This parser function casts a string to a float. This is useful for creating an array containing a float.
Description edit
{{#af_float: value }}
Parameters edit
- value : string or float
- The value to cast to a float.
Return values edit
Returns the casted float.
Examples edit
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 }} }} }} |
|
af_foreach edit
ArrayFunctions version | ≥ 1.0 |
This parser function provides a way to iterate over arrays.
Description edit
{{#af_foreach: array | key_name | value_name | body }}
Parameters edit
- array : array
- The array over which to iterate.
- key_name : string, default=null
- The name to use for the key.
- value_name : string, default=null
- The name to use for the value.
- body : string
- The body to return for each iteration.
Return values edit
Returns the resulting wikitext.
Examples edit
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! |
af_get edit
ArrayFunctions version | ≥ 1.0 |
This parser function retrieves the element with the given index from the given array. If the index does not exist, the empty string is returned.
Description edit
{{#af_get: array | *indices }}
Parameters edit
- array : array
- The array in which to index.
- *indices : string
- The index. Multiple indices can be given to index nested arrays.
Return values edit
Returns the indexed value, or the empty string if the index does not exist.
Examples edit
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 }} }} |
|
Get a nested element | {{#af_get: {{#af_list: a | {{#af_object: hello=world }} }} | 1 | hello }} |
world |
af_if edit
ArrayFunctions version | ≥ 1.0 |
This parser function selects one of two alternatives based on the given predicate.
Description edit
{{#af_if: predicate | consequent | alternative }}
Parameters edit
- predicate : boolean
- The predicate.
- consequent : string
- The value to return if the predicate holds (i.e. is true).
- alternative : string, default=""
- The value to return if the predicate does not hold (i.e. is false).
Return values edit
Returns the consequent if the predicate holds, or the alternative if it is given and the predicate does not hold.
Examples edit
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 edit
ArrayFunctions version | ≥ 1.0 |
This parser function casts a string to an integer. This is useful for creating an array containing an integer.
Description edit
{{#af_int: value }}
Parameters edit
- value : string or int
- The value to cast to an integer.
Return values edit
Returns the casted integer.
Examples edit
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}} }} }} |
|
af_intersect edit
ArrayFunctions version | ≥ 1.2 |
This parser function computes the intersection of arrays. This function preserves keys.
Description edit
{{#af_intersect: array | *arrays }}
Parameters edit
- array : array
- The first array.
- *arrays : array
- The other arrays.
Return values edit
Returns the intersection of the given arrays.
Examples edit
Compute the intersection of two identical arrays | {{#af_print: {{#af_intersect: {{#af_list: a | b | c }} | {{#af_list: a | b | c }} }} }} |
|
Compute the intersection of two partially overlapping arrays | {{#af_print: {{#af_intersect: {{#af_list: a | b | c }} | {{#af_list: c | d | e }} }} }} |
|
af_isarray edit
ArrayFunctions version | ≥ 1.0 |
This parser function checks if the given value is an array.
Description edit
{{#af_isarray: value }}
Parameters edit
- value : mixed
- The value to check.
Return values edit
Returns true if value
is an array, false otherwise.
Examples edit
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 edit
ArrayFunctions version | ≥ 1.0 |
This parser function recursively joins the items of an array together with a given separator.
Description edit
{{#af_join: array | glue }}
Parameters edit
- array : array
- The array to join.
- glue : string, default=""
- The string used to join each item. This parameter recognises the following escape sequences:
\s
for spaces\n
for newlines\\
for backslashes
Return values edit
Returns the joined array.
Examples edit
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 edit
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 edit
{{#af_keysort: array | key | descending=descending | caseinsensitive=caseinsensitive }}
Parameters edit
- array : array
- The array to sort.
- key : string
- The key of the values on which the sort should be based.
- descending : boolean, default=false
- Whether to sort in a descending order.
- caseinsensitive : boolean, default=false
- Whether to ignore case when sorting.
Return values edit
Returns the sorted array.
Examples edit
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 }} }} |
|
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 }} }} |
|
af_ksort edit
ArrayFunctions version | ≥ 1.7 |
This parser function sorts an array by key.
Description edit
{{#af_ksort: array | descending=descending | caseinsensitive=caseinsensitive }}
Parameters edit
- array : array
- The array to sort.
- descending : boolean, default=false
- Whether to sort in a descending order.
- caseinsensitive : boolean, default=false
- Whether to ignore case when sorting.
Return values edit
Returns the sorted array.
Examples edit
Sort by key | {{#af_print: {{#af_ksort: {{#af_object: c=banana | a=orange | b=apple }} |
|
af_list edit
ArrayFunctions version | ≥ 1.0 |
This parser function creates a new list from the given parameters.
Description edit
{{#af_list: *values }}
Parameters edit
- *values : mixed
- The values for the list.
Return values edit
Returns the resulting list.
Examples edit
Create a simple one-dimensional list | {{#af_print: {{#af_list: a | b | c }} }} |
|
Create a multi-dimensional list | {{#af_print: {{#af_list: {{#af_list: a | b }} | {{#af_list: c | d }} }} }} |
|
Create a list of objects | {{#af_print: {{#af_list: {{#af_object: name=Harry | age=22 }} | {{#af_object: name=Bobby | age=29 }} }} }} |
|
af_map edit
ArrayFunctions version | ≥ 1.0 |
This parser function applies a callback to each element of a list.
Description edit
{{#af_map: array | value_name | callback }}
Parameters edit
- 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 edit
Returns the resulting mapped array.
Examples edit
Appending a string to each element | {{#af_print: {{#af_map: {{#af_list: a | b | c }} | v | {{{v}}}-appended }} }} |
|
Altering list elements | {{#af_print: {{#af_map: {{#af_list: {{#af_list: a }} | {{#af_list: b }} }} | v | {{#af_push: {{{v}}} | c }} }} }} |
|
af_merge edit
ArrayFunctions version | ≥ 1.2 |
This parser function computes the union of 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.
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 edit
{{#af_merge: array | *arrays }}
Parameters edit
- array : array
- The first array.
- *arrays : array
- The other arrays.
Return values edit
Returns the union of the given arrays.
Examples edit
Appending a string to each element | {{#af_print: {{#af_merge: {{#af_list: a | b | c }} | {{#af_list: d | e | f }} }} }} |
|
af_object edit
ArrayFunctions version | ≥ 1.0 |
This parser function creates a new object from the given parameters.
Description edit
{{#af_object: **values }}
Parameters edit
- **values : mixed
- The values for the object.
Return values edit
Returns the resulting object.
Examples edit
Create a simple one-dimensional object | {{#af_print: {{#af_object: 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 }} }} }} }} }} |
|
af_print edit
ArrayFunctions version | ≥ 1.0 |
This parser function prints the given value for debug purposes. Unlike #af_show, it does not parse the value, but does support printing lists and objects. This function should only be used for debug purposes. Consider using #af_show to display a value to the reader.
Description edit
{{#af_print: *values | end=end }}
Parameters edit
- *values : mixed
- The values to print.
- end : string, default=""
- The string to append to the end of each printed value. This parameter recognises the following escape sequences:
\s
for spaces\n
for newlines\\
for backslashes
Return values edit
Returns the value in human-readable form.
Examples edit
Print a boolean | {{#af_print: {{#af_bool: yes }} }} |
true |
Print a list | {{#af_print: {{#af_list: a | b | c }} }} |
|
af_push edit
ArrayFunctions version | ≥ 1.0 |
This parser function adds the given value to the end of the list.
Description edit
{{#af_push: array | value }}
Parameters edit
- array : array
- The array to append the value to.
- value : mixed
- The value to add.
Return values edit
Returns the array with the value appended.
Examples edit
Push a value | {{#af_print: {{#af_push: {{#af_list: a | b }} | c }} }} |
|
af_reduce edit
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 edit
{{#af_reduce: array | carry_name | value_name | callable | initial }}
Parameters edit
- 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, default=""
- The initial carry to use.
Return values edit
Returns the resulting value.
Examples edit
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_search edit
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 edit
{{#af_search: array | value }}
Parameters edit
- array : array
- The array to search in.
- value : mixed
- The value to search for.
Return values edit
Returns the first corresponding key if the value is found, nothing otherwise.
Examples edit
Search for a value in an array | {{#af_print: {{#af_search: {{#af_list: a | b | c }} | b }} }} |
1 |
af_set edit
ArrayFunctions version | ≥ 1.0 |
This parser function sets the given value for the given index.
Description edit
{{#af_set: value | array | *indices }}
Parameters edit
- 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 edit
Returns the array with the given index set to the given value.
Examples edit
Replace an existing value | {{#af_print: {{#af_set: d | {{#af_list: a | b | c }} | 2 }} }} |
|
Create a new index | {{#af_print: {{#af_set: far | {{#af_object: foo=bar }} | boo }} }} |
|
Create a new subarray | {{#af_print: {{#af_set: far | {{#af_object: foo=bar }} | boo | far }} }} |
|
af_show edit
ArrayFunctions version | ≥ 1.4 |
This parser function prints the given value in a human-readable format. Unlike #af_print, this parser function parses the value. It does not support showing lists or objects.
Description edit
{{#af_show: value }}
Parameters edit
- value : mixed
- The value to show.
Return values edit
Returns the value in human-readable form.
Examples edit
Show a value | {{#af_show: Hello World! }} |
Hello World! |
af_slice edit
ArrayFunctions version | ≥ 1.0 |
This parser function extracts a slice from the given array. Keys will be reset and reordered.
Description edit
{{#af_slice: array | offset | length }}
Parameters edit
- array : array
- The array to take a slice from.
- offset : integer
- 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 edit
The slice.
Examples edit
Get the first two elements | {{#af_print: {{#af_slice: {{#af_list: a | b | c }} | 0 | 2 }} }} |
|
Get the last element | {{#af_print: {{#af_slice: {{#af_list: a | b | c }} | -1 }} }} |
|
af_sort edit
ArrayFunctions version | ≥ 1.0 |
This parser function sorts the given list.
Description edit
{{#af_sort: array | descending=descending | caseinsensitive=caseinsensitive }}
Parameters edit
- array : array
- The array to sort.
- descending : boolean, default=false
- Whether to sort the list in descending order.
- caseinsensitive : boolean, default=false
- Whether to ignore case when sorting.
Return values edit
Returns the sorted list.
Examples edit
Sort a list in ascending order | {{#af_print: {{#af_sort: {{#af_list: b | c | a }} }} }} |
|
Sort a list in descending order | {{#af_print: {{#af_sort: {{#af_list: b | c | a }} | descending=true }} }} |
|
af_split edit
ArrayFunctions version | ≥ 1.1 |
This parser function splits the given string based on a delimiter.
Description edit
{{#af_split: string | delimiter }}
Parameters edit
- string : string
- The string to split.
- delimiter : string, default=","
- The delimiter to use. This parameter recognises the following escape sequences:
\s
for spaces\n
for newlines\\
for backslashes
Return values edit
Returns the resulting list.
Examples edit
Split a string based on commas | {{#af_print: {{#af_split: a, b, c }} }} |
|
Split a sentence into words | {{#af_print: {{#af_split: Lorem ipsum dolor et | \s }} }} |
|
af_stringmap edit
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 edit
{{#af_stringmap: value | delimiter | value_name | callback | new_delimiter | conjunction }}
Parameters edit
- value : string
- The delimited string.
- delimiter : string
- The delimiter to split
value
on. If the empty string is given, "," is used. This parameter recognises the following escape sequences:\s
for spaces\n
for newlines\\
for backslashes
- 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, default=", "
- The new delimiter to insert in between the mapped items. This parameter recognises the following escape sequences:
\s
for spaces\n
for newlines\\
for backslashes
- conjunction : string, default=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. This parameter recognises the following escape sequences:\s
for spaces\n
for newlines\\
for backslashes
Return values edit
Returns the resulting delimited string.
Examples edit
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 edit
ArrayFunctions version | ≥ 1.0 |
This parser function will invoke the given template and pass the values in the given array as arguments.
Description edit
{{#af_template: name | data }}
Parameters edit
- 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 edit
The expanded template.
Examples edit
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 edit
ArrayFunctions version | ≥ 1.8 |
This parser function will trim the given character from the beginning and the end of the given string.
Description edit
{{#af_trim: string | characters }}
Parameters edit
- string : string
- The string that will be trimmed.
- characters : string
- The characters to trim.
Return values edit
The trimmed string.
Examples edit
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}}} | ! }} }} }} |
|
af_unique edit
ArrayFunctions version | ≥ 1.0 |
This parser function removes duplicate values from the given array. This function does not reset keys.
Description edit
{{#af_unique: array }}
Parameters edit
- array : array
- The array from which to remove duplicates.
Return values edit
Returns the array with duplicates removed.
Examples edit
Remove duplicates from an array | {{#af_print: {{#af_unique: {{#af_list: a | a | b | c | b }} }} }} |
|
af_unset edit
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 edit
{{#af_unset: array | *indices }}
Parameters edit
- 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 edit
Returns the array with the given index removed.
Examples edit
Remove a top-level index | {{#af_print: {{#af_unset: {{#af_list: a | b | c }} | 2 }} }} |
|
Remove a top-level index, keys not reset | {{#af_print: {{#af_unset: {{#af_list: a | b | c }} | 1 }} }} |
|
Remove a nested index | {{#af_print: {{#af_unset: {{#af_object: foo={{#af_object: bar=quz | far=buz }} }} | foo | bar }} }} |
|
Scribunto edit
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 }} }} |
|
mw.af.export edit
ArrayFunctions version | ≥ 1.0 |
This Lua function exports a Lua table as an ArrayFunctions array.
Description edit
mw.af.export( table )
Parameters edit
- table : array
- The array to export.
Return values edit
Returns the table as an ArrayFunctions array.
mw.af.import edit
ArrayFunctions version | ≥ 1.6 |
This Lua function imports an ArrayFunctions array as a Lua table.
Description edit
mw.af.import( array )
Parameters edit
- array : array
- The array to import.
Return values edit
Returns the array as a Lua table.
Magic words edit
The extension defines a number of magic words (variables).
AF_EMPTY edit
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 edit
{{AF_EMPTY}}
Return values edit
Returns the empty array.
See also edit
- Extension:Arrays - similar extension that works by first defining and then manipulating arrays. Incompatible with Parsoid.
- Extension:PhpTags Functions/Functions/Array - includes over fifty functions for working with arrays using the PHP syntax.
- Extension:Scribunto - allows you to embed Lua scripts into wikipages.
This extension is included in the following wiki farms/hosts and/or packages: This is not an authoritative list. Some wiki farms/hosts and/or packages may contain this extension even if they are not listed here. Always check with your wiki farms/hosts or bundle to confirm. |