How to handle a nil variable value with a String Measure

[Cariboudjan]

If you have a variable that may or may not exist, and you want to ensure that if the variable does not exist, that "#VariableName#" still references a value (eg. "0"), use the below String Measure.

Code: Select all

[ChangeNilTo0]
Measure=String
String=#VariableName#
IfMatch=0
IfMatchAction=THINGS THAT HAPPEN IF VALUE IS 0
Substitute="[\x0023]VariableName[\x0023]":"0"

The Substitute= in the above example uses [\x0023] Unicode, meaning "#". Using Unicode instead of "#" will prevent the substitute from interpreting #VariableName# as a variable (In which case, if the variable does exist, the value would always equal 0).

[balala]

Yes, but what if the value of the #VariableName# is exactly 0? For instance, in case you have it defined as VariableName=0 in the [Variables] section, or you set it to 0 through a !Setvariable bang,

[Cariboudjan]

Yes, but what if the value of the #VariableName# is exactly 0? For instance, in case you have it defined as VariableName=0 in the [Variables] section, or you set it to 0 through a !Setvariable bang,

This is to return 0 in the event that the variable does not exist. 0, even if defined, is an acceptable value in this example. This is merely a failsafe in case the variable does not exist.