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17 lines
1.6 KiB
Plaintext
17 lines
1.6 KiB
Plaintext
created: 20150123220223000
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modified: 20240709170746678
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tags: Filters
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title: Dominant Append
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type: text/vnd.tiddlywiki
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[[Filters]] manipulate [[sets of titles|Title Selection]] in which no title may appear more than once. Furthermore, they often need to append one such set to another.
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This is done in such a way that, if a title would be duplicated, the earlier copy of that title is discarded. The titles being appended are dominant.
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For example, if a selection contains `Andrew Becky Clara Daniel` and `Andrew Barney Clara Daisy` is then appended to it, the result is `Becky Daniel Andrew Barney Clara Daisy`.
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This behaviour can cause unexpected results when working with [[Mathematics Operators]]. For example, `1 2 3 +[sum[]]` evaluates to `6`, as expected. But `1 1 1 +[sum[]]` evaluates to `1`. Removing the `+[sum[]]` from each filter reveals the problem: `1 2 3` evaluates to the list `1`, `2`, `3`, while `1 1 1` evaluates to the single item `1` due to de-duplication.
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In such situations, the `=` prefix can be used to disable the de-duplication. For example, `=1 =1 =1 +[sum[]]` evaluates to `3` as expected. Alternatively, the [[split Operator]] can be used: `[[1,1,1]split[,]sum[]]`.
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<<.tip """To build a list of unique values that retains only the <<.em earliest>> copy of each value (the opposite behavior from <<.link "Dominant Append" "Dominant Append">>), first use the <<.link `:all` "All Filter Run Prefix">> filter run prefix (or its short form `=`) to retain all duplicate values while building your list. Then finish your filter run with the <<.olink unique>> operator to remove later duplicates.""">> |