Is this Loop executed synchronous?

Question

i have written this Loop to iterate over some data i've got out of my CouchDB database. I am wondering if this Loop is executed synchronous or if i have to handle it with async/await for example.

database.view('test', 'getAllowedTracker', function(err, body) {
  for(let i = 0; i < body.rows.length; i++){
    let array = body.rows[i].value;
    var newArray = array.filter((value) => value!='tracker8');
    database.atomic('test', 'updatetest', body.rows[i].key, {field: "tracker", value: newArray}).then((response) => {
    });
  }
})

It seems to be synchronous but i am not really sure. If the filter function would be executed after the updating (database.atomic...) that would be fatal.

I am not used to work with asynchronous programming so

Thanks for the help.

It's asynchronous, since you're not handling the `then` in any way. — AKX, Dec 14 '19 at 15:16
The loop is running synchronously, the `then` callbacks won't. — Bergi, Dec 14 '19 at 15:24

score 1 · Accepted Answer · answered Dec 14 '19 at 15:19

1

In JavaScript for loop and Array.filter() are synchronous. Your code is good there is nothing to worry about.

JavaScript will run asynchronously in callback and promise. You can Google more about it.

answered Dec 14 '19 at 15:19

Pakpoom Tiwakornkit

2,601
1
20
19

Is this Loop executed synchronous?

1 Answers1