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TiddlyWiki5/editions/tw5.com/tiddlers/pragmas/Pragma_ _parameters.tid
Mohammad Rahmani 9b78e871aa
Update ParametersWidget and add Examples (#7464)
* Update ParametersWidget and add Examples

This PR updates the  ParametersWidget.tid and adds several examples

* Update Procedure and Parameters Pragma

This PR improve documentation for using parameters inside procedures

* Update Pragma_ _procedure.tid

A caution when use parameters inside procedures

* Resolved conversation

All comments by Jeremy were implemented.
2023-05-22 10:46:45 +01:00

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created: 20220917113154900
modified: 20230518143557045
tags: Pragmas
title: Pragma: \parameters
type: text/vnd.tiddlywiki
<<.from-version "5.3.0">> The ''\parameters'' [[pragma|Pragmas]] is used within [[procedure|Procedure Definitions]] and [[widget|Custom Widgets]] definitions to declare the parameters that are expected, and their default values. It is a shortcut syntax for the ParametersWidget.
```
\parameters (<name>[:<default-value>],<name>[:<default-value>]...)
```
For example:
```
\parameters (firstname:"Joe",lastname:"Blogs")
```
To illustrate the use of ''\parameters'' pragma, see [[Core Icons]] which are parameterised. The first parameter `size` specified the size at which the icon should be rendered. For example see the text of [[$:/core/images/print-button]] tiddler. The first line defines the size parameter as `\parameters (size:"22pt")`
<<wikitext-example-without-html """{{$:/core/images/print-button|16px}}
<$transclude $tiddler="$:/core/images/print-button" size="32px"/>
""">>
In the above example, the first line shows a simple transclusion of [[$:/core/images/print-button]] icon with `size` parameter passed by position and is set to 16px. The second line is a transclusion of image with `size` parameter passed by name and is set to 32px.