All Questions
Tagged with node.js javascript
12,592
questions
3219
votes
34
answers
2.3m
views
Using async/await with a forEach loop
Are there any issues with using async/await in a forEach loop? I'm trying to loop through an array of files and await on the contents of each file.
import fs from 'fs-promise'
async function ...
- 52.8k
874
votes
24
answers
330k
views
How do I convert an existing callback API to promises?
I want to work with promises but I have a callback API in a format like:
###1. DOM load or other one time event:
window.onload; // set to callback
...
window.onload = function() {
};
###2. Plain ...
- 275k
1222
votes
49
answers
2.1m
views
Error: Can't set headers after they are sent to the client
I'm fairly new to Node.js and I am having some issues.
I am using Node.js 4.10 and Express 2.4.3.
When I try to access http://127.0.0.1:8888/auth/facebook, i'll be redirected to http://127.0.0.1:...
- 14.1k
240
votes
7
answers
38k
views
When is .then(success, fail) considered an antipattern for promises?
I had a look at the bluebird promise FAQ, in which it mentions that .then(success, fail) is an antipattern. I don't quite understand its explanation as for the try and catch.
What's wrong with the ...
- 4,701
194
votes
4
answers
151k
views
Is it an anti-pattern to use async/await inside of a new Promise() constructor?
I'm using the async.eachLimit function to control the maximum number of operations at a time.
const { eachLimit } = require("async");
function myFunction() {
return new Promise(async (resolve, ...
user5487299
172
votes
15
answers
209k
views
setState doesn't update the state immediately [duplicate]
I would like to ask why my state is not changing when I do an onClick event. I've search a while ago that I need to bind the onClick function in constructor but still the state is not updating.
Here's ...
- 10.4k
205
votes
6
answers
145k
views
async function implicitly returns promise?
I read that async functions marked by the async keyword implicitly return a promise:
async function getVal(){
return await doSomethingAync();
}
var ret = getVal();
console.log(ret);
but that is ...
- 97.3k
1765
votes
36
answers
2.9m
views
How do I completely uninstall Node.js, and reinstall from beginning (Mac OS X)
My version of node is always v0.6.1-pre even after I install brew node and NVM install v0.6.19.
My node version is:
node -v
v0.6.1-pre
NVM says this (after I install a version of node for the first ...
- 42k
199
votes
5
answers
70k
views
Is it bad practice to have a constructor function return a Promise?
I'm trying to create a constructor for a blogging platform and it has many async operations going on inside. These range from grabbing the posts from directories, parsing them, sending them through ...
- 5,869
60
votes
2
answers
43k
views
Updating a Nested Array with MongoDB
I am trying to update a value in the nested array but can't get it to work.
My object is like this
{
"_id": {
"$oid": "1"
},
"array1": [
...
- 1,128
1562
votes
13
answers
528k
views
What is the purpose of Node.js module.exports and how do you use it?
What is the purpose of Node.js module.exports and how do you use it?
I can't seem to find any information on this, but it appears to be a rather important part of Node.js as I often see it in source ...
- 24.1k
1833
votes
42
answers
2.8m
views
map function for objects (instead of arrays)
I have an object:
myObject = { 'a': 1, 'b': 2, 'c': 3 }
I am looking for a native method, similar to Array.prototype.map that would be used as follows:
newObject = myObject.map(function (value, ...
- 115k
1510
votes
21
answers
968k
views
How can I get the full object in Node.js's console.log(), rather than '[Object]'?
I have this object:
const myObject = {
"a":"a",
"b":{
"c":"c",
"d":{
"e":"e",
"...
user1372449
2111
votes
18
answers
2.1m
views
Writing to files in Node.js
I've been trying to find a way to write to a file when using Node.js, but with no success. How can I do that?
- 23k
889
votes
32
answers
942k
views
How can I print a circular structure in a JSON-like format?
I have a big object I want to convert to JSON and send. However it has circular structure, so if I try to use JSON.stringify() I'll get:
TypeError: Converting circular structure to JSON
or
...
- 54.4k