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 use an argument, $args[1], to replace references to named items, such as attributes with arguments, such as $args[1], $args[2]. To .
To use the macro in an expression, specify:
...
isGreaterThanOne(_out.AppleHarvestDate)
See also: Expressions , and 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. |
...
This sample macro is called padCost. It takes 1 parameter - a numeric value. It checks to see if the numeric value is missing a 0 before a decimal point. If so, it adds the 0 and returns the string. It can be called anywhere in phixflow PhixFlow that an expression can be entered (, for example) , with :
padCost(".977")
| Code Block |
|---|
do(
$val = $args[1],
if( startsWith($val, "."),
// if the cost is positive, add a zero onto the beginning
"0" + $val,
// ELSE
if( startsWith($val, "-."),
//if the cost is negative, replace the -. with a -0.
"-0." + substring($val,3),
//ELSE
$val
)
)
) |
...