Reference FQL API reference String concat() string.concat() Concatenate two Strings. Signature concat(other: String) => String Description Concatenates two provided Strings. This method is equivalent to using the + operator with String operands. The input Strings aren’t modified. Parameters Parameter Type Required Description other String true String to concatenate to the calling String. Return value Type Description String The resulting concatenated String. Examples Concatenate the calling String with the String "SUCCESS": "HTTP/1.1 200 OK".concat(" SUCCESS") "HTTP/1.1 200 OK SUCCESS" casefold() endsWith()