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Jeremy Ruston 2025-03-09 17:01:31 +00:00
parent 7397f4fa3a
commit 2a1542c4e5
2 changed files with 18 additions and 3 deletions
editions/tw5.com/tiddlers/filters/syntax
Let Filter Run Prefix.tidvarlist Operator.tid

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editions/tw5.com/tiddlers/filters/syntax/Let Filter Run Prefix.tid

@ -3,7 +3,7 @@ from-version: 5.3.7
modified: 20250307212252946
rp-input: all titles from previous filter runs
rp-output: an empty title list is always returned from the "let" filter run prefix
rp-purpose: assign the result of a filter run to a variable
rp-purpose: assign the results of a filter run to a variable
tags: [[Named Filter Run Prefix]]
title: Let Filter Run Prefix
type: text/vnd.tiddlywiki
@ -18,6 +18,7 @@ type: text/vnd.tiddlywiki
[[run|"Filter Run"]]
"""/>
The `:let` filter run prefix assigns the first result of a filter run to a variable that is made available to the remaining [[filter runs|Filter Run]] in the [[filter expression|Filter Expression]]. If the filter run does not return any results then the variable is set to an empty string.
The `:let` filter run prefix assigns the result list of a filter run to a variable which is made available to the remaining [[filter runs|Filter Run]] in the [[filter expression|Filter Expression]]. Only the first item in the result list is returned when the variable is accessed in the usual way (or an empty string if the result list is empty). The special [varlist Operator] is used to access all the items in the result list.
Within the filter run the [[all Operator]] with an empty parameter retrieves all the titles from the previous filter runs, instead of the usual behaviour of retieving all the titles that were passed to the filter expression.
Within the filter run the [[all Operator]] with an empty parameter retrieves all the titles from the previous filter runs, instead of the usual behaviour of retieving all the titles that were passed to the filter expression.

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editions/tw5.com/tiddlers/filters/syntax/varlist Operator.tid Normal file

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caption: varlist
created: 20250307212252946
modified: 20250307212252946
op-input: ignored
op-output: the list items stored in the variable
op-parameter: the name of a variable
op-purpose: retrieve the value of a variable as a list
tags: [[Filter Operators]] [[Selection Constructors]]
title: varlist Operator
type: text/vnd.tiddlywiki
The parameter specifies the name of a variable that has been assigned a list of items by a [[let filter run prefix|Let Filter Run Prefix]]. The operator retrieves all the list items.
<<.operator-examples "varlist">>