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changecount macro change the wording ... just a bit (#7147)

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Mario Pietsch 2022-12-24 16:59:48 +01:00 committed by GitHub
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editions/tw5.com/tiddlers/variables/Variables.tid
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created: 20141002133113496
modified: 20150221215644000
modified: 20221221175615776
tags: Concepts Reference
title: Variables
type: text/vnd.tiddlywiki
A <<.def variable>> is a snippet of text that can be accessed by name within a particular branch of the [[widget tree|Widgets]]. The snippet is known as the variable's <<.def value>>.
A new variable is defined using a <<.wlink SetWidget>> widget, and is then available to any of the children of that widget, including transcluded content. A <<.wid set>> widget can reuse an existing name, thus binding a different snippet to that name for the duration of the widget's children.
A new variable is defined using a <<.wlink SetWidget>> or <<.wlink LetWidget>> widget, and is then available to any of the children of that widget, including transcluded content. A <<.wid set>> widget can reuse an existing name, thus binding a different snippet to that name for the duration of the widget's children.
The <<.wlink ListWidget>> widget also sets a particular variable (<<.var currentTiddler>> by default) to each listed title in turn.
The <<.wlink ListWidget>> widget by default sets a particular variable <<.var currentTiddler>> to each listed title in turn.
For an overview of how to use variables, see [[Variables in WikiText]].
Despite the term <<.word variable>>, each snippet is a constant string. The apparent variability is actually the result of the presence of multiple variables with the same name in different parts of the widget tree.
Despite the term <<.word variable>>, ''each snippet is a constant string''. The apparent variability is actually the result of the presence of multiple variables with the same name in different parts of the widget tree.
[[Macros]] are a special form of variable whose value can contain placeholders that get filled in with parameters whenever the macro is used.