A Macro allows PhixFlow to define and retain functions (macros) can be called repeatedly.

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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.
Expression
Expression	The script that evaluates to a value based on the input parameters.
Description
Description	Optional: a description of the macro.

Example

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 that an expression can be entered (for example) with :

padCost(".977")

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
    )
  )
)