Railo 4.2 Reference
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Object Method String.listCompact

remove empty items at the and and at the start of the list
String.listCompact([string delimiters,[boolean multiCharacterDelimiter]]):string

Arguments

The arguments for this function are set. You can not use other arguments except the following ones.
Name Type Required Description
delimiters string  No Characters that separate list elements. The default value is comma.
multiCharacterDelimiter boolean  No specifying whether the delimiters parameter specifies a multi-character delimiter. If this parameter is true, the delimiters parameter must specify a single delimiter consisting of multiple characters. This parameter enables the ListToArray function to convert a list such as the following to an array of color names: red:|orange:|yellow:|green:|blue:|indigo:|violet.