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Passing optional parameters to EOL [message #1810931]

Thu, 22 August 2019 09:12

Nicolas Hili

Messages: 40
Registered: March 2017

Member

Hi,

I am trying to pass optional parameters to an EOL file using the "Parameters" configuration tab under "EOL Program" in the "Run Configurations" menu.

I am trying the following simple EOL program (adapted from here):

/**
 * Hello World 
 * Optional parameter: "message" (type: String)
 */

if (message.isDefined()) {
	message.println();
}
else {
	'parameter is not defined'.println();
}

When I do not define the message parameter, I'd like the program to execute the code located inside the else branch. It appears it is impossible since message.isDefined() gets me the following error:

Quote:

Undefined variable, type or model: 'message'

Is there a service to retrieve parameters in a different way so that the "message" variable would exist but would be undefined?

Thanks,

Nicolas

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Re: Passing optional parameters to EOL [message #1810978 is a reply to message #1810931]

Thu, 22 August 2019 22:37

Sina Madani

Messages: 160
Registered: November 2015
Location: York, UK

Senior Member

Hi Nicolas,

This is most likely an unintended behaviour, since your example demonstrates the need to distinguish between a variable existing and being null vs. not even being declared. I have updated Epsilon to work in the special case of this operation.

Thanks,
Sina

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