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    • Output the values of multiple fields as text separated by a "separator"

    Question

    Task: Concatenate values from different fields into a single string using a separator, such as a comma. For example, there are several fields: #city, #street, #name, #surname, #nickname.

    Sometimes not all fields are filled, resulting in duplicate commas, like: City, , Vasily, , Vasea.

    Or sometimes it ends up like: , , , , Vasea.

    I thought about using strSplit, but I couldn't figure it out with this function.

    = : str`#books + $if{var: "field" = "books"} + #first_attempt + $if{var: "field" = "first_attempt"} + #second_attempt`

    if: if(condition: #$field != ""; then: ", "; else: "")

        field: $#field

    produces an error. I can't figure out where to fix it. #$field, $#field?

    Logically, I understand what it should be, but the code... why #$field has a hash in front and here $#name - after the dollar sign

    Answer

    The most effective approach is to create a list of the required fields, filter out the empty values, and convert it into a string using listJoin:

    =: listJoin(list: $filtered_list; str: ", ")

filtered_list: listFilter(list: $list; key: "value" != "")
    list: listCreate(item: #city; item: #street; item: #name; item: #surname; item: #nickname)