How to update a constant without deleting existing values in the constant using update constant smart service?

Question

Hi guys, 
 I have a constant with array of Text values Now user enters a text value in the form which should be updated or added to that constant I am using update constant smart service in process model but constant is being overridden by new value deleting all the existing values in the constant How to add the new value to the existing values without deleting them 
 Thank you

Dave Lewis · Accepted Answer

You want to append or concatenate. 
 Constant NAME => "Jane" 
 Save "Steve" as cons!NAME 
 NAME => "Steve" 
 Save cons!NAME & "Harold" as cons!NAME 
 NAME => "SteveHarold" 
 save append(cons!NAME, "Harriet") as cons!NAME 
 NAME => {"SteveHarold";"Harriet"}

How to update a constant without deleting existing values in the constant using update constant smart service?

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