You could so somethink like ,
function readyToSubmit(answerPack, answerArr, len) {
for (var i = 0; i < answerArr.length; i++) {
var questionId = answerArr[i].id;
doasynch(questionId);
}
}
function doasynch(questionId) {
userStore.getDoc(id).then(function (doc) {
doc.questionId = questionId;
answerPack.push(doc);
});
}
Read