code: function wrapStreams () {
      // Iterate over the param-array (which should consist of Streams)
      for (let stream of arguments) {
          // Set a textContent property
          stream.textContent = "";
  
          // Set the stream encoding
          stream.setEncoding ("utf-8");
  
          // When the stream receives data, add it to the textContent
          stream.on ("data", (data) => { stream.textContent += data; });
      }
  }
docs: Helper functions