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28 lines
1.3 KiB
Plaintext
28 lines
1.3 KiB
Plaintext
caption: subfilter
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created: 20181031175129475
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modified: 20181031175129475
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op-input: a [[selection of titles|Title Selection]] passed as input to the subfilter
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op-neg-input: a [[selection of titles|Title Selection]] passed as input to the subfilter
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op-neg-output: those input titles that are <<.em not>> returned from the subfilter <<.place S>>
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op-output: the [[selection of titles|Title Selection]] returned from the subfilter <<.place S>>
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op-parameter: a [[filter expression|Filter Expression]]
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op-parameter-name: S
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op-purpose: select titles from the operand interpreted as a [[filter expression|Filter Expression]]
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tags: [[Filter Operators]] [[Field Operators]] [[Selection Constructors]] [[Negatable Operators]]
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title: subfilter Operator
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type: text/vnd.tiddlywiki
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<<.from-version "5.1.18">> Note that the subfilter operator was introduced in version 5.1.18 and is not available in earlier versions.
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<<.tip " Literal filter operands cannot contain square brackets but you can work around the issue by using a variable:">>
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```
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<$set name="myFilter" value="[tag[one]]">
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<$list filter="[all[tiddlers]subfilter<myFilter>]">
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...
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```
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<<.tip "Compare with the similar [[filter|filter Operator]] operator which runs a subfilter against each title, returning those titles that return a non-empty list (and discards the results of the subfilter)">>
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<<.operator-examples "subfilter">>
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