SAPUI5 Using promises to wait for code execution - sapui5

Question

I'm in a loop here and for each iteration I'm calling _checkExistingDefaultTimes to check if a record exists.
The problem is, the code in the loop is not executed until I'm outside the for loop.
Is there any way I can use a Promise so that it forces the .then code (pushing oOpeningTimes) before the loop finishes?
var oOpeningTimes = [];
for (var i = 0; i < numberOfDays; i++) {
this._checkExistingDefaultTimes(test.SiteInfo.SiteId,test.EffectiveDateFrom,
test.EffectiveDateTo)
.then(function (bResult) {
oOpeningTimes.push({
temporaryDate: oDate,
startTime1: oModelData[oWeekday].startTime1,
endTime1: oModelData[oWeekday].endTime1,
});
});
oStoreData.OpeningTimes = oOpeningTimes;
oModel.setData(oStoreData);

Answer 1

After the loop, no. The for-loop is a synchronous construct and the promise is async. What you need to do is wait until all of the promises generated in the loop are resolved before running your follow-on code. This is what Promise.all is for. You could do something like the following:
var oOpeningTimes = [];
var oPromises = [];
for (var i = 0; i < numberOfDays; i++) {
oPromises.push(this._checkExistingDefaultTimes(test.SiteInfo.SiteId,test.EffectiveDateFrom,
test.EffectiveDateTo)
.then(function (bResult) {
oOpeningTimes.push({
temporaryDate: oDate,
startTime1: oModelData[oWeekday].startTime1,
endTime1: oModelData[oWeekday].endTime1,
});
}));
Promise.all(oPromises).then(function() {
oStoreData.OpeningTimes = oOpeningTimes;
oModel.setData(oStoreData);
})