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Level 8

Here's a slight improvement that's a bit more verbose:

myArray=[];

for (var a=1;a<4;a++){

if (xfa.resolveNode("TextField0"+a).rawValue!=null && xfa.resolveNode("TextField0"+a).rawValue!=""){

  myArray.push(xfa.resolveNode("TextField0"+a).rawValue);

  }

}

this.rawValue=myArray.join(", ");

Kyle