Update the Salesforce CRM Contact Object with SSJS. Looping through DE with SSJS.

UpdateCRMObject.ssjs

<script runat="server">
Platform.Load("Core","1.1.1");

var records = DataExtension.Init("DeNameToGetValues");
var data = records.Rows.Retrieve({Property:"run",SimpleOperator:"equals",Value:1}); // DE should have a field called 'run' that is boolean to filter.
var datalength = data.length;

for (var i = 0 ; i < data.length ; i ++) {
    var sf_fieldUpdateString = [];
    sf_fieldUpdateString.push(data[i].SubscriberKey);
    sf_fieldUpdateString.push('DeFieldName_1');
    sf_fieldUpdateString.push(data[i].CrmApiEndPoint_1);
    sf_fieldUpdateString.push('DeFieldName_2');
    sf_fieldUpdateString.push(data[i].CrmApiEndPoint_2);
    sf_fieldUpdateString.push('DEFieldName_3');
    sf_fieldUpdateString.push(1); // send a hardcoded 'true' value

    var updateSFObject = "";
    updateSFObject += "\%\%[ ";
    updateSFObject += "set @salesforceFields = UpdateSingleSalesforceObject('Contact',";
    updateSFObject += "'" +  sf_fieldUpdateString.join("','") + "'";
    updateSFObject += ") ";
    updateSFObject += "output(concat(@salesforceFields)) ";
    updateSFObject += "]\%\%";
    var idToUpdate = data[i].SubscriberKey;
   try {

      results = Platform.Function.TreatAsContent(updateSFObject);
      var processing = records.Rows.Update({flag:'0'}, ['Subscriberkey'], [idToUpdate]);

    } catch (e) {

      if (debug) { Write("<br>updateSF error: " + Stringify(e)); }

    }
     
}
  Write(Stringify(results)); 
</script>

Nice and clear to understand.
Thank you

Please drop a documentation for this code, I want to create some thing similar in my org.