Functions

.=function() { 
   var x = new Date();
   x.setDate(1);
   x.setMonth(x.getMonth()-1);
   return ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'][x.getMonth()];
}()

With Arguments

For example, val here is the result of the parseJSON transformation:

.=function() { 
   return  val.type + " " + val.riskType;
}()