Translating a while loop to a promise - node.js

Question

I am trying to create a report which is stretching the limits of my understanding of both Node and MySQL.
I have already established that the annual date information I need will need to be called for each year I want to display. I now have a query that can return the correct data that I need, I just need to repeat that within a Node environment.
Coming from a Delphi background the following code would provide me with the data I need
LoadTurnover = function (req, reply) {
const queryDay = "-04-06";
const maxDate = new Date();
let queryYear = 2000;
let qd = new Date(queryYear + queryDay);
let dateArray = [];
while (qd < maxDate) {
// Get the data from the server
let data = getData(sql);
//
let turnoverObj = {};
turnoverObj.date = qd;
turnoverObj.Employees = data[0][0].Employees;
turnoverObj.Leavers = data[1][0].Leavers;
// Add current year data to our result set
dateArray.push(turnoverObj);
// Setup the next year condition
queryYear ++;
qd = new Date(queryYear + queryDay);
}
};
I need to be able send a Promise to the DB server (getData) and populate the turnoverObj and dateArray appropriatly. This needs to repeat until qd is greater than today's date.

Answer 1

You can use .map() function of Bluebird promise:
var Promise = require('bluebird);
let dates = [];
let dateArray = [];
while (qd < maxDate) {
dates.push(qd);
queryYear++;
qd = new Date(queryYear + queryDay);
}
Promise.map(dates, function(singleDate){
return getData(sql).then(function(data){
let turnoverObj = {};
turnoverObj.date = singleDate;
turnoverObj.Employees = data[0][0].Employees;
turnoverObj.Leavers = data[1][0].Leavers;
dateArray.push(turnoverObj);
return;
});
}).then(function(finalResult){
console.log(dateArray);
});
Hope this helps somehow.