We have also faced such problem where we want to loop through array of objects and
further get a detailed information about user from user id and add this into all objects
respectively. I can explain with two examples where one works but the other does not:
1- Working example:
// Here info is the array of objects
var newArr = [];
if(info.length > 0){
for(let element of info) {
element = JSON.parse(JSON.stringify(element));
if(element.sender_id != ''){
// this function fetches user information from database which takes some moment
var user = await this.getUserById(element.sender_id);
element.user = user[0];
newArr.push(element);
}
}
}
2- Example does not work:
// Here info is the array of objects
var newArr = [];
if(info.length > 0){
info.forEach(element => {
element = JSON.parse(JSON.stringify(element));
if(element.sender_id != ''){
// this function fetches user information from database which takes some moment
var user = await this.getUserById(element.sender_id);
element.user = user[0];
newArr.push(element);
}
});
}
In second example you will get a blank array because forEach does not support
async await feature of node js. So, we have to use "for of" which helps you
to achieve your requirement as stated above. This same situation will work
if you are working with APIs to get some information from other server.
