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* Improve Filter Syntax documentaion / navigation * update links and missing diagrams * rename legacy prefix to shortcut prefix * Update editions/tw5.com/tiddlers/filters/Filter Operators.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/And Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Cascade Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/And Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * add most changes a suggested by yaisog * fix copy / paste from-version * replace operand with parameter in the docs * fix typo * fix typos and improve railroad diagrams consistency * move "new from version" info for filter run prefixes below the table * fix typo transclusion and substitution * Move Filters tiddler to the top level in the TOC * wip-breadcrumbs * breadcrumbs & breadcrumbsList macro final * remove files that do not belong to this PR * restore release banner * add simple / story mode to breadcrumbs * .breadcrumbs macro update comments * new breadcrumbs CSS, woks with small screens * make CSS configurable using hidden-settings * improve CSS fro small screens * remove the initial: recursiveParentTag macro * improve location info for breadcrumbs nav. add "alt-text" for Edge ::after element * breadcrumbs add mode=field * bc add initial docs * breadcrumbsField will also respect the story ordering * add configurable global filterMode setting * improve arrow CSS for browser zooming * add bc links use bc-caption if caption field is non-empty * breadcrumbs improve comments * breadcrumbs aria-lable uses caption if there is one * breadcrumbs improve documentation * breadcrumbs improve docs for sort param * fix showArrows docs * remove .bc-link aria-label .. it's not needed if caption is resolved properly * use subfilter instead of enlist to evaluate the "excluded" variable. Be consistent with toc-macros * remove breadcrumbs macros - they have their own PR now * resolve conflict * add back doc-macros tiddler * integrate :then filter run prefix * remove .breadcrumbs macros and their config tiddlers * fix typos as requested --------- Co-authored-by: yaisog <m@rcuswinter.de>
47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
created: 20211124151912931
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from-version: 5.1.23
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modified: 20230710073305239
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rp-input: the filter output of all previous runs so far
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rp-output: the accumulated single item
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rp-purpose: replaces all filter output so far with a single item by repeatedly applying a filter run to each input title
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tags: [[Named Filter Run Prefix]]
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title: Reduce Filter Run Prefix
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type: text/vnd.tiddlywiki
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<$railroad text="""
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\start none
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\end none
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( ":reduce" | - )
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[[run|"Filter Run"]]
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"""/>
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Each input title from previous runs is passed to this run in turn. The result of each previous call to this run is made available in the next call via the variable named <<.var accumulator>>. The result of the last call to this run is returned as the output. A typical use is to add up the values in a given field of each input title.
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Replaces all filter output so far with a single item by repeatedly applying a formula, as described above, to each input title.
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The following variables are available within the filter run:
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* <<.var accumulator>> - the result of the previous filter run
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* <<.var currentTiddler>> - the input title
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* <<.var ..currentTiddler>> - the value of the variable `currentTiddler` outside the filter run. <<.from-version "5.2.0">>
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* <<.var index>> - the numeric index of the current list item (with zero being the first item in the list)
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* <<.var revIndex>> - the reverse numeric index of the current list item (with zero being the last item in the list)
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* <<.var length>> - the total length of the input list
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<<.tip "Compare named filter run prefix `:reduce` with [[reduce Operator]] which is used to flatten a list of items down to a single item by repeatedly applying a subfilter.">>
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```
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[tag[shopping]] :reduce[get[quantity]add<accumulator>]
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```
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is equivalent to:
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```
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\define num-items() [get[quantity]add<accumulator>]
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[tag[shopping]reduce<num-items>]
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```
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[[Reduce Filter Run Prefix (Examples)]] |