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27 lines
1.3 KiB
Plaintext
27 lines
1.3 KiB
Plaintext
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created: 20221009162634214
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modified: 20230419103154329
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tags: Pragmas
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title: Pragma: \function
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type: text/vnd.tiddlywiki
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<<.from-version "5.3.0">> The ''\function'' [[pragma|Pragmas]] is used to [[define custom functions|Functions]]. It is a shortcut syntax for the SetVariableWidget.
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The usual form allows custom functions to span multiple lines:
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```
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\function <function-name>(<param-name>[:<param-default-value>],<param-name>[:<param-default-value>]...)
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<multiple-line-definition-text>
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\end [<function-name>]
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```
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Note that the `\end` marker can optionally specify the name of the function to which it relates, enabling function definitions to be nested inside procedures, macros or widget definitions.
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There is also a single line form for shorter functions:
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```
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\function <function-name>(<param-name>[:<param-default-value>],<param-name>[:<param-default-value>]...) <single-line-definition-text>
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```
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The first line of the definition specifies the function name and any parameters. Each parameter has a name and, optionally, a default value that is used if no value is supplied on a particular call to the function. The lines that follow contain the text of the function (i.e. the snippet represented by the function name), until `\end` appears on a line by itself:
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See [[Functions]] for more details.
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