Get last value "Check In Comment" document library SharePoint REST API

Due to the closure of "the blog TechNet" I transfer all my articles in the blog :)

When you check in a document, you can add a brief comment about the changes you made. This is a great way for others to see a summary of your edits. If you ever need to edit a comment you can check out the document again, immediately check it back in, select Overwrite the current version, and then add the new comment in the Comment box.
This article shows how to use the REST API to load a last value from the "Check In comment" field in the document library.

Pre-requisites
1.SharePoint server 2013, 2016, 2019.
2.Editor for working with Javascript files.

window.onload= function(){
    // getting the GUID of list.
    var listGUID = _spPageContextInfo.pageListId;
    // getting the item id
    var itemId = '1';
    // clearing the value inside the tdCheckInComment
    $("#tdCheckInComment").html('');
    // checking if list guid found or not.
    if(listGUID)
    {
        //removing {} from the variable.
        listGUID = listGUID.replace(/[{}]/g, "");
        // checkin if item id is found or not.
        if(itemId)
        {
            var comment = GetLastCheckInComment(listGUID,itemId);
            if(comment)
            {
                $("#tdCheckInComment").html(comment);
            }
        }
    }
}
function GetLastCheckInComment(listGUID,itemId) {
    var returnValue;
    try {
        jQuery.ajax({
            url: _spPageContextInfo.webAbsoluteUrl + "/_api/web/lists(guid'" + listGUID + "')/items(" + itemId + ")/File/CheckInComment",
            type: "GET",
            async: false,
            headers: { "Accept": "application/json;odata=verbose" },
            success: function (data, textStatus, xhr) {
                returnValue = data.d.CheckInComment;
            },
            error: function (data, textStatus, xhr) {
                console.error('Error while getting the last check in comment.');
            }
        });
    }
    catch (ex) {
    }
    return returnValue;
}
<table>
<tr>
    <th><label id="lblComment">Comment:  </label></th>
    <td id="tdCheckInComment"></td>
</tr>
</table>

Happy Coding!