<div style='font-family:Arial; font-size:13px;'><div>Hi,</div><div><br></div><div>given this:</div><div><div style="color: rgb(212, 212, 212); background-color: rgb(30, 30, 30); font-family: Consolas, "Courier New", monospace; font-size: 14px; line-height: 19px; white-space: pre;"><div><span style="color: #569cd6;">import</span> <span style="color: #4ec9b0;">Data.Time</span></div><br><div><span style="color: #569cd6;">data</span> <span style="color: #569cd6;">DatabaseItem</span> = DbString <span style="color: #569cd6;">String</span></div><div>                  | DbNumber <span style="color: #569cd6;">Integer</span></div><div>                  | DbDate   <span style="color: #569cd6;">UTCTime</span></div><div>                  <span style="color: #569cd6;">deriving</span>  (<span style="color: #569cd6;">Eq</span>, <span style="color: #569cd6;">Ord</span>, <span style="color: #569cd6;">Show</span>)</div><br><div><span style="color: #dcdcaa;">theDatabase</span> :: [<span style="color: #569cd6;">DatabaseItem</span>]</div><div>theDatabase =</div><div>    [ DbDate (UTCTime</div><div>             (fromGregorian <span style="color: #b5cea8;">1911</span> <span style="color: #b5cea8;">5</span> <span style="color: #b5cea8;">1</span>)</div><div>      (secondsToDiffTime <span style="color: #b5cea8;">34250</span>))</div><div>    , DbNumber <span style="color: #b5cea8;">9001</span></div><div>    , DbString <span style="color: #ce9178;">"Hello, world!"</span></div><div>    , DbDate (UTCTime</div><div>             (fromGregorian <span style="color: #b5cea8;">1921</span> <span style="color: #b5cea8;">5</span> <span style="color: #b5cea8;">1</span>)</div><div>             (secondsToDiffTime <span style="color: #b5cea8;">34123</span>))</div><div>    ]</div></div><div><div style="font-family:Arial; font-size:13px;"><br></div></div></div><div style="font-family:Arial; font-size:13px;"><br></div><div style="font-family:Arial; font-size:13px;">question from textbook is : write a function that filters for DbDate values and returns a list of the UTCTime values inside them.<br></div><div style="font-family:Arial; font-size:13px;"><br></div><div style="font-family:Arial; font-size:13px;"><br></div><div style="font-family:Arial; font-size:13px;">my question could you give me an example of a working function, I don't get how i use the filter function on a data type in a list. Hence i am kinda stuck.</div><div style="font-family:Arial; font-size:13px;"><br></div><div style="font-family:Arial; font-size:13px;">thanks in advance.</div><div style="font-family:Arial; font-size:13px;"><br></div><div style="font-family:Arial; font-size:13px;">best,</div><div style="font-family:Arial; font-size:13px;"><br></div><div style="font-family:Arial; font-size:13px;"><br></div></div>