Railo 4.2 Reference
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Object Method String.listIndexExists

Determines if an element at the given position exists or not
String.listIndexExists(number index,[string delimiter,[boolean includeEmptyFields]]):boolean


The arguments for this function are set. You can not use other arguments except the following ones.
Name Type Required Description
index number  Yes index to check for.
delimiter string  No Characters that separate list elements. The default value is comma.
includeEmptyFields boolean  No if set to true, empty values are included as well