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Overview
Sometimes we might want to write our own expressions that can be used time and again. To do this we can write a macro.
To make an expression reusable in different contexts, you need to replace any references to named items, such as attributes with arguments, such as $args[1], $args[2]. To use the macro in an expression, specify:
macro_name(argument_name)
For example, we want to reuse an expression:
if( out.AppleHarvestDate < 1, 1, 0)
Create a macro called isGreaterThanOne that contains the expression:
if($args[1] > 1, 1, 0)
To use the macro, replacing $ars[1] with the pipe and attribute name _out.AppleHarvestDate:
isGreaterThanOne(_out.AppleHarvestDate)
See also: Expressions, Scripts and Macros
Properties
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Basic Settings
| Field | Description |
|---|---|
| Name | The name of the macro. This name is also how the macro will be invoked (called) from elsewhere in PhixFlow |
| Minimum Parameters | The minumum number of parameters that must be passed to the macro when it is invoked. |
| Maximum Parameters | The maximum number of parameters that may be passed to the macro when it is invoked. |
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