mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-26 19:47:20 +00:00
Clarify opposite handling of de-duplication order for unique Operator vs Dominant Append (#8357)
This commit is contained in:
parent
ad5661ef1c
commit
753b289ba9
@ -1,5 +1,5 @@
|
||||
created: 20150123220223000
|
||||
modified: 20190610165255223
|
||||
modified: 20240709151004998
|
||||
tags: Filters
|
||||
title: Dominant Append
|
||||
type: text/vnd.tiddlywiki
|
||||
@ -13,3 +13,5 @@ For example, if a selection contains `Andrew Becky Clara Daniel` and `Andrew Bar
|
||||
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.
|
||||
|
||||
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[]]`.
|
||||
|
||||
<<.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.""">>
|
@ -1,4 +1,6 @@
|
||||
caption: unique
|
||||
created: 20240709151018238
|
||||
modified: 20240709151336906
|
||||
op-input: a list of items
|
||||
op-output: a list of unique items
|
||||
op-parameter: ignored
|
||||
@ -7,4 +9,6 @@ tags: [[Filter Operators]] [[Order Operators]] [[Listops Operators]]
|
||||
title: unique Operator
|
||||
type: text/vnd.tiddlywiki
|
||||
|
||||
<<.note """Unlike the default <<.link "Dominant Append" "Dominant Append">> handling of duplication, the effect of <<.op unique>> is to retain only the <<.em earliest>> instance among duplicated values.""">>
|
||||
|
||||
<<.operator-examples "unique">>
|
||||
|
Loading…
Reference in New Issue
Block a user