Counting number of words in a list found in a phrase

[stchln]

Hello

I am trying to count number of times one of the words in a list is found in a phrase

Unfortunately, the M-code I tried to make do not get the correct result

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8jZU0lHKz0tVKCnPB7KKM/JLc1IU0jLzUhSMFDLzFEBS+UVg2VgdoHIjoCJMpYYgpXA1xiA1GUWpqWiqDJRiYwE=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [ID = _t, Words = _t, Phrase = _t]),
    #"Split Column by Delimiter" = Table.ExpandListColumn(Table.TransformColumns(Source, {{"Words", Splitter.SplitTextByDelimiter(" ", QuoteStyle.Csv), let itemType = (type nullable text) meta [Serialized.Text = true] in type {itemType}}}), "Words"),
    #"Changed Type" = Table.TransformColumnTypes(#"Split Column by Delimiter",{{"ID", type text}, {"Words", type text}, {"Phrase", type text}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Words"}, {{"AllData", each _, type table [ID=text, Words=text, Phrase=text]}}),
    #"Added Custom" = Table.AddColumn(#"Grouped Rows", "WordsList", each [AllData][Words]),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "PhraseAsList", each [AllData][Phrase]),
    #"Added Custom2" = Table.AddColumn(#"Added Custom1", "Counting", each fNwordsInPhrase(#"Added Custom1"[PhraseAsList],#"Added Custom1"[WordsList]))
in
    #"Added Custom2"

where the function fNwordsInPhrase is defined as

= (List1 as list, List2 as list) =>
let
    MyPhrase = List1,
    MyWords = List2,
    MyResult = List.Count(List.Difference(MyPhrase, MyWords))
in
    MyResult

And what I get is Counting is always equal to 3

I cannot find my error in function or in the list of operations before the function is called to transform strings into two lists WordsList and PhraseAsList. Also, there is maybe simpler way for getting same result in DAX

Thanks for your help!

[AllisonKennedy]

@stchln  How much volume of data do you have? One problem here is with the List.Difference function, which will always give you the number of rows in that first list, and another problem is that you haven't turned the phrase into a list. 

This will work, but might not be the most efficient: 

let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8jZU0lHKz0tVKCnPB7KKM/JLc1IU0jLzUhSMFDLzFEBS+UVg2VgdoHIjoCJMpYYgpXA1xiA1GUWpqWiqDJRiYwE=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [ID = _t, Words = _t, Phrase = _t]),
#"Split Column by Delimiter" = Table.ExpandListColumn(Table.TransformColumns(Source, {{"Words", Splitter.SplitTextByDelimiter(" ", QuoteStyle.Csv), let itemType = (type nullable text) meta [Serialized.Text = true] in type {itemType}}}), "Words"),
#"Split Column by Delimiter1" = Table.ExpandListColumn(Table.TransformColumns(#"Split Column by Delimiter", {{"Phrase", Splitter.SplitTextByDelimiter(" ", QuoteStyle.None), let itemType = (type nullable text) meta [Serialized.Text = true] in type {itemType}}}), "Phrase"),
#"Changed Type" = Table.TransformColumnTypes(#"Split Column by Delimiter1",{{"ID", type text}, {"Words", type text}, {"Phrase", type text}}),
#"Added Conditional Column" = Table.AddColumn(#"Changed Type", "Contains", each if [Words] = [Phrase] then 1 else 0),
#"Grouped Rows1" = Table.Group(#"Added Conditional Column", {"ID"}, {{"Count", each List.Sum([Contains]), type number}, {"AllData", each _, type table [ID=text, Words=text, Phrase=text]}})
in
#"Grouped Rows1"

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[stchln]

Thanks a lot Allison, what a speed!