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each Operator

 9th December 2019 at 8:59am
purposeselect one of each group of input titles by field
inputa selection of titles
suffixoptionally, list-item or value
parameterF=the name of a field, defaulting to title
outputa selection containing the first input title encountered for each distinct value of field F

Learn more about how to use Filters

Each input title is processed in turn. The value of field F in the corresponding tiddler is examined.

each
As long as the value of the field is unique (i.e. has not been encountered before), the title is appended to the output.
each:list-item
The value is treated as a title list. Each title in the list considered in turn. If it has not been encountered before, it is appended to the output.
each:value
As long as the title is unique it is appended to the output whether or not the corresponding tiddler exists.

Note that if a tiddler does not contain field F, it is treated as if the value of the field were empty. Thus, a filter expression such as [each[motovun]] will return one tiddler that doesn't have a motovun field, as well as one tiddler with each distinct value of that field, if any. To obtain just the tiddlers that have a non-blank value for the motovun field one can use [each[motovun]has[motovun]].

Examples