Functions with parameters do not work correctly: the returned value is sometimes different from the expected one. The example script works correctly only when idx = 1 (instead of the current line 6).
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in publications is governed by House rules. 님은 즐겨찾기로 이 스크립트를 차트에서 쓸 수 있습니다.