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How to handle a nil variable value with a String Measure

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Cariboudjan
Posts: 247
Joined: May 12th, 2019, 8:55 am

How to handle a nil variable value with a String Measure

Post by 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).
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balala
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Re: How to handle a nil variable value with a String Measure

Post by 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,
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Cariboudjan
Posts: 247
Joined: May 12th, 2019, 8:55 am

Re: How to handle a nil variable value with a String Measure

Post by Cariboudjan »

balala wrote: November 16th, 2022, 3:29 pm 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.