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Thanks for sharing the complete solutions!

There are functional alternatives to forEach, for and other array operations.

For example, this code:

   let itemsAsList: string[] = [];

    itemsAsSet.forEach((v) => {
        if (v !== undefined && v !== null) itemsAsList.push(v);
    });

    return itemsAsList;

can be written as:

let itemsAsList = itemsAsSet.filter((v) =>
  v !== undefined && v !== null
));

return itemsAsList;