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Custom Comparison Function for Table.Sort()

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  • Custom Comparison Function for Table.Sort()

    Custom Comparison Function for Table.Sort()
    to make Table Sorting case-insensitive


    Rationale:
    When attempting to sort table values alphabetically, the default outcome of the Table.Sort() command on the following table:
    Code:
    tList = {"Dave", "dave", "mary", "Mary", "Adam", "adam"};
    Table.Sort(tList, nil);
    
    Debug.Clear();
    Debug.ShowWindow(true);
    
    for key, value in pairs (tList) do
        Debug.Print(value.."\r\n");
    end
    ...will produce this ‘less-than-ideal’ result:
    Code:
    Adam
    Dave
    Mary
    adam
    dave
    mary
    This outcome is produced by default because the ASCII definition for "lower case" is greater than that of "Upper Case"
    .
    Eg.
    By ASCII definition, the lower case "a" character is decimal 97.
    By ASCII definition, the Upper Case "A" character is decimal 65.
    .
    So, by default Upper Case will always be displayed first.
    .
    To get the Table.Sort() command to override its default output and instead, display output in a ‘more-ideal’ case-insensitive manner such as this:
    Code:
    Adam
    adam
    Dave
    dave
    Mary
    mary
    ...it's first necessary to add a custom comparison function to the Table.Sort() command’s parameters.
    .
    To this end (and to save others some needless head banging), three examples of custom comparison functions are demonstrated in this .Apz example. The 1st example may be considered as the simplest solution. But the 3rd and final example may be considered as being the most thorough and robust solution.
    .
    Enjoy. And may the coding gods be with you.
    - BioHazard
    Attached Files

  • #2
    thanks dude

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