function getOffset(cursor, defaultOffset) {
    if (typeof cursor === 'undefined' || cursor === null) {
        return defaultOffset;
    }

    let offset = cursorToOffset(cursor);
    if (isNaN(offset)) {
        return defaultOffset;
    }

    return offset;
}
function getOffset(cursor, defaultOffset) {
    if (typeof cursor === 'undefined' || cursor === null) {
        return defaultOffset;
    }

    let offset = cursorToOffset(cursor);
    if (isNaN(offset)) {
        return defaultOffset;
    }

    return offset;
}
function getOffset ( cursor , defaultOffset ) { if ( typeof cursor === 'undefined' || cursor === null ) { return defaultOffset ; } let offset = cursorToOffset ( cursor ) ; if ( isNaN ( offset ) ) { return defaultOffset ; } return offset ; }
Given an optional cursor and a default offset, returns the offset to use; if the cursor contains a valid offset, that will be used, otherwise it will be the default.
Given an optional cursor and a default offset returns the offset to use ; if the cursor contains a valid offset that will be used otherwise it will be the default .