1
0
mirror of https://github.com/Jermolene/TiddlyWiki5 synced 2024-11-24 10:37:20 +00:00
TiddlyWiki5/editions/tw5.com/tiddlers/concepts/SelectionConstructors.tid
2015-01-29 13:41:11 +00:00

14 lines
922 B
Plaintext

created: 20150117204109000
modified: 20150129133830000
tags: Concepts
title: Selection Constructors
type: text/vnd.tiddlywiki
The output of a [[filter|Filters]] step depends on its [[operator|Filter Operators]]:
* Most operators derive their output from their input. For example, many of them output a subset of their input, and thus truly live up to the name of <<.word filters>>, narrowing down the overall output of the containing [[run|Filter Run]]. These operators are called <<.def "selection modifiers">>.
* A few operators ignore their input and generate an independent output instead. These are called <<.def "selection constructors">>: they construct an entirely new [[selection|Title Selection]].
A good example of a constructor is <<.olink title>>. The output of `[title[A]title[B]]` is just <<.tid B>>. But the <<.olink field>> operator is a modifier, so `[title[A]field:title[B]` outputs nothing at all.