Looks to me like a simple map operation with String.join().
Optional<String[]> given = Optional.ofNullable(new String[]{"a", "b"});var joinedString = given.map(s -> String.join("", s));System.out.println(joinedString.get()); // prints "ab"↧
Answer by Federico klez Culloca for How to turn a optional of an string array into a optional of a string?
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