18 lines
1.1 KiB
Plaintext
18 lines
1.1 KiB
Plaintext
created: 20190330100101453
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modified: 20190330100101453
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tags: [[Filter Operators]] [[Special Operators]]
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title: getvariable Operator
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caption: getvariable
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op-purpose: select all values of variables named in the input titles
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op-input: a selection of variable names
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op-parameter: ignored
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op-output: the values of each of the variables named in the input titles (or blank if the variable is not defined)
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<<.from-version "5.1.20">> The usual way to retrieve a variable value within a filter is with the angle brackets notation. For example, `[<currentTiddler>]` will retrieve the value of the variable called `currentTiddler`.
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The `getvariable` filter operator provides an alternative way to retrieve a variable. For example, `[[currentTiddler]getvariable[]]` is another way to retrieve the value of the variable `currentTiddler`.
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The advantage of `getvariable` is that it makes it possible to work with variables whose name is computed, and not known in advance. For example, `[<myvariable>getvariable[]]` gets the value of the variable whose name is given in the variable `myvariable`.
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<<.operator-examples "getvariable">>
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