TiddlyWiki5/editions/tw5.com/tiddlers/filters/previous.tid

created: 20140410103123179
modified: 20150124171748000
tags: [[Filter Operators]] [[Field Operators]] [[Order Operators]]
title: previous Operator
type: text/vnd.tiddlywiki
caption: previous
purpose: find which titles in a <<.field list>> field precede the input ones

<$macrocall $name=".operator-def"
input="a [[selection of titles|Title Selection]]"
parameter="a tiddler title"
paramName="t"
output="a selection containing each title that immediately precedes each of the input titles in the <<.field list>> field of <<.place t>>"
/>

Each input title is processed in turn, and its predecessor is located in the <<.field list>> field and appended to the output. If a title is not listed in the field, or is the first item there, then it contributes nothing to the output.

<<.operator-examples "previous">>
Update tiddler filter docs 2014-04-10 18:56:51 +00:00			`created: 20140410103123179`
Overhaul the filter operator documentation: part 2 2015-01-24 21:18:44 +00:00			`modified: 20150124171748000`
			`tags: [[Filter Operators]] [[Field Operators]] [[Order Operators]]`
			`title: previous Operator`
Update tiddler filter docs 2014-04-10 18:56:51 +00:00			`type: text/vnd.tiddlywiki`
Overhaul the filter operator documentation: part 2 2015-01-24 21:18:44 +00:00			`caption: previous`
			`purpose: find which titles in a <<.field list>> field precede the input ones`
Update tiddler filter docs 2014-04-10 18:56:51 +00:00
Overhaul the filter operator documentation: part 2 2015-01-24 21:18:44 +00:00			`<$macrocall $name=".operator-def"`
			`input="a [[selection of titles\|Title Selection]]"`
			`parameter="a tiddler title"`
			`paramName="t"`
			`output="a selection containing each title that immediately precedes each of the input titles in the <<.field list>> field of <<.place t>>"`
			`/>`
Update tiddler filter docs 2014-04-10 18:56:51 +00:00
Overhaul the filter operator documentation: part 2 2015-01-24 21:18:44 +00:00			`Each input title is processed in turn, and its predecessor is located in the <<.field list>> field and appended to the output. If a title is not listed in the field, or is the first item there, then it contributes nothing to the output.`
Update tiddler filter docs 2014-04-10 18:56:51 +00:00
Overhaul the filter operator documentation: part 2 2015-01-24 21:18:44 +00:00			`<<.operator-examples "previous">>`