Recursive function in JS

Question

EDIT:

The code i provide includes a asynchron task in each interation, therefor i need the recursive function, my question is how to beautify the code and apply the proper use.

I want to:

• Remove the processTask(); function call and let it call itself instead.

• Choose the best function declaration.

  connection.query(queryString, function (err, rows, fields) {
      if (err) return throwSQLError(err, req, res, connection);
  
      var rowLength = rows.length;
      var taskIteration = 0;
  
      // Iterate over all tasks with a recursive function
      var processTask = function () {
          if (taskIteration < rowLength) {
              // I do asynch stuff and call those two lines below
              // in the callback of the asynch operation.
              taskIteration++;
              processTask();
          }
          else {
              // Send JSON to result
              res.json(inputArray);
  
              // Close MySQL connection
              connection.end();
          }
      };
      processTask();
  });
  

I'm thinking something like this might work:

function processTask(){ // Which function creator to use?
    if (taskIteration < rowLength) {
        // I do asynch stuff and call those two lines below
        // in the callback of the asynch operation.
        taskIteration++;
        processTask();
    }
    else {
        // Send JSON to result
        res.json(inputArray);

        // Close MySQL connection
        connection.end();
    }
}(); // instead of the explicit function call, call the function calls itself

Answer 1

Why not just

connection.query(queryString, function (err, rows, fields) {
    if (err) return throwSQLError(err, req, res, connection);

    rows.forEach(function (row) {
        // do what you need to with each row;
    });

    /* or maybe even
    var result = rows.map(function (row) {
        // do what you need to with row and return it
    });
    and then do something with result
    */
    res.json(inputArray); // Not clear from the question where inputArray has come from 
    connection.end();
}