无法读取未定义的属性“ 0”

Question

I'm getting a weird undefined error when I'm triying to use pkgcloud and also the property length is undefined :

var pkgcloud = require('pkgcloud');
var Q = require('q');
router.get('/', function(req, res, next) {

var conn = pkgcloud.compute.createClient({
    provider: 'openstack', // required
    username: 'demo', // required
    password: 'azerty', // required
    authUrl: 'http://192.168.0.242:5000' ,
    region_name :'RegionOne'// required
});
console.log(conn);

At this stage I can visualize the different methods of the object conn , but the error is generated within the for loop:

var d = Q.defer();
conn.getImages(function(err, images) {

    for (var i=0; i<images.length; i++) {
        console.log("id: " + images[i].id);
        console.log("name: " + images[i].name);
        console.log("created: " + images[i].created);
        console.log("updated: " + images[i].updated);
        console.log("status: " + images[i].status + "\n");
    }
    if (err) {
        console.log("erreur");
        d.reject(err);
    } else {
        console.log("juste");
        d.resolve();
    }
});
  res.render('index', { title: 'Express' });
});

Answer 1

If you are receiving array of objects please consider using console.table(); - that will save your time. As everyone said do the error check first then if no error print output. I don't know if SO will render table in snippet so please check your browser's console for table output.

 const img = [{ id: 1, name: "cat", created: '21-07-99', updated: '21-07-99', status: "new" }, { id: 2, name: "dog", created: '26-07-00', updated: '26-07-00', status: "new" }, { id: 3, name: "rabbit", created: '16-02-10', updated: '26-04-10', status: "modified" }]; con = (err, image) => { if (err) { console.log("ERROR", err); return; } console.table(image); }; con("404 not found",img); //error 404 will print err con(null, img); //no error so img