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has Operator

6th March 2023 at 2:32pm
purposefilter the input by field existence
inputa selection of titles
suffixS=Introduced in v5.1.14 optionally, the keyword field or Introduced in v5.1.22 optionally, the keyword index
parameterF=the name of a field or, optionally an index
outputwithout suffix
» those input tiddlers in which field F has a non-empty value
suffix field
» those input tiddlers in which field F exists
suffix index
» those input data tiddlers in which index F exists
! outputwithout suffix
» those input tiddlers in which field F does not exist or has an empty value
suffix field
» those input tiddlers in which field F does not exist
suffix index
» those input data tiddlers in which index F does not exist

Learn more about how to use Filters