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var dateTableName = "Dates"; // Name of your date table
var dateKeyColName = "Date"; // Name of the date key column in the table
var colOperations = new List<Tuple<string, string, bool>>(){
    Tuple.Create("Quarter & Year", "QuarternYear", true),
    Tuple.Create("Month & Year", "MonthnYear", true),
    Tuple.Create("Month Name", "MonthOfYear", true),
    Tuple.Create("Month Short", "MonthOfYear", true),
    Tuple.Create("Month Initial", "MonthOfYear", true),
    Tuple.Create("Week & Year", "WeeknYear", true),
    Tuple.Create("Day of Week Name", "DayOfWeek", true),

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let
    extractCharactersByCase = (input as nullable text, optional caseType as text) as text =>
        Text.Combine(
            List.Select(
                Text.ToList(input ?? ""),
                (s) =>
                    if Text.Proper(caseType ?? "Upper") = "Upper"
                    then not (Text.Lower(s) = s)
                    else not (Text.Upper(s) = s)
            )

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let
    fxExtractEightDigitSequence = let 
        extractEightDigitSequence = (txt as nullable text, optional Occurrence as number) =>
        let
            input = txt ?? "",
            parts = Text.SplitAny(input, Text.Remove(input, {"0" .. "9"})),
            digits = List.Select(parts, each Text.Length(_) = 8)
        in
            {List.First(digits), List.Last(digits), digits}{(Occurrence ?? 0)},
        extractEightDigitSequenceType = type function (

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let
    fxFindMinMaxDates = (tableNames as list, optional dateColsID as text, optional excludeDateColNames as list) as record =>
    let
        selectedTables = Record.SelectFields(
            #sections[Section1],
            tableNames,
            MissingField.Ignore
        ),
        rawData = Table.RemoveColumns(
            Table.Combine(Record.ToList(selectedTables)),

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let
    /* Samples */
    myList = {0..4},
    myTable = Table.FromValue({0..4}),
    
    /* List | Item Access */
    ListRequiredItemAccess = {0..4}{1},
    ListRequiredItemAccess2 = {0..4}{10},
    ListOptionalItemAccess = {0..4}{10}?,

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let
    /* Samples */
    myRecord = [#"1"=1, Two=2],
    myTable = Table.FromColumns({{0..2}, {3..5}}),
    
    /* Record | Field Selection or Lookup */
    RecRequiredFieldAccess = [#"1"=1, Two=2][Two],
    RecRequiredFieldAccess2 = [#"1"=1, Two=2][Beep],
    RecOptionalFieldAccess = [#"1"=1, Two=2][Beep]?,

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let
    /* The July 2025 update to the documentation now mentions a MissingField type for Table.TransformColumnTypes */
    /* Here's sample data, a table with two columns: Date and Value */
    Source = #table(
        type table [Date = date, Value = number],
        {
            {#date(2024, 3, 12), 0.24368},
            {#date(2024, 5, 30), 0.03556},
            {#date(2023, 12, 14), 0.3834}
        }

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let
    fxTrim = (string as nullable text, optional addPunctuationMarks as text) as text =>
        [
            baseMarks = ".,;:?!'-–—_",
            marks = Text.ToList(baseMarks & (addPunctuationMarks ?? "")),   
            clean = Text.Combine(
                List.Transform(
                    Splitter.SplitTextByCharacterTransition(each true, marks)(string),
                    Text.Trim
                )