2014-04-10 18:56:51 +00:00
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created: 20140410103123179
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2015-01-19 19:37:26 +00:00
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modified: 20150119192449000
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2015-01-18 18:39:00 +00:00
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tags: [[Filter Operators]] [[Common Operators]] [[Field Operators]]
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title: has Operator
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type: text/vnd.tiddlywiki
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caption: has
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purpose: filter the input tiddlers by field existence
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<$macrocall $name=".operator-def"
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syntax="has[f]"
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input="a [[selection|Title Selections]] of tiddler titles"
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parameter="the name of a field"
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paramName="f"
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output="the [[subselection|Title Selections]] of the input tiddlers that have a value in field <<.place f>>"
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/>
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<<.op has>> filters out both of the following:
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* tiddlers that don't contain field <<.place f>>
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* tiddlers in which field <<.place f>> exists but has an empty value
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;Negation
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: `!has` outputs the subset of the input tiddlers in which field <<.place f>> does <<.em not>> exist or does not have the value <<.place p>>.
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<<.operator-examples "has">>
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