## Javascript – How can you better check if an object is empty?

I have the following object:

let obj = {};

When I try to validate obj.length give me one back undefinedSo I used the alternative Object.keys. Object.keys(obj).length.. solved my problem .. but I would like to know if there is an alternative? some native javascript function .. i dont know!

Thank you!

## I want to fill an empty SharePoint online list with a CSV file using JavaScript

I want to fill an empty SharePoint online list with JavaScript.
The JavaScript retrieves data from a CSV file.
Now I want help with JavaScript code, where I can first save the data from the CSV file in an array and then update each file line by line with SPService.
The CSV file contains 7 columns.
In the Excel table above, I have inserted column headings so that the first row is also skipped.

## Empty array of IMotionControllers for Unreal with Oculus Quest

The typical method for setting up a motion controller in Unreal Engine is blueprints. However, I try to identify different types of motion controllers for different VR setups and apply the orientation and position data from there. I have no problems getting Oculus Rift and Vive controllers and trackers with C ++, but with Oculus Quest the array filled with IMotionControllers is empty when debugging via ADB. Why could that be?

The following code only outputs a length of 0 for Oculus Quest.

const FName feature = FName(TEXT("MotionController"));
TArray controllers = IModularFeatures::Get().GetModularFeatureImplementations(feature);
UE_LOG(LogGloveController, Warning, TEXT("Number of Controllers: %d"), controllers.Num());

## User behavior – "Your app is empty man!" / How do I change UI / UX to stop this type of feedback?

I have an application that aims to get people to meet during activities / outs.
There are two ways to suggest an activity to other members:

1. Invite someone right away. All members could then see the proposal and participate.
2. Inviting only certain membersby selecting those of our choice (members are well listed and can be selected in other tabs). Only these members could see and participate. Full confidentiality.

I have a real problem with UX.
To present the problem, here is a basic and simple structure of my current user interface.

Basically two tabs on which the actually proposed outs (current or future) or past are listed. and a list of the main content of the Out.

Main feedback from my users:
""The app sounds empty, there are not many recommended outs!""

The UX user interface clearly does not emphasize that "you, users, are not expected to see everything that is expected of you Only see outs that concern you and that you are invited to! "",

I briefly explain: "It's like emails, when I email Julia, only Julia gets it, not you! So if you only see 3 outs displayed, it doesn't mean another member is doing this can. " I don't see 3000 outs on your side. Everything depends on whether you are invited or not. "

When I explain that, everyone LOVES the app and really starts inviting other members and making suggestions without waiting. You become active and not passive.

How to transform my user interface so that the user understands the idea of ​​data protection / confidentiality of outsand don't assume that "if I don’t see many outs on YOUR side, it means the app is 'desert'."

The first time I started the app, I thought about an interactive tutorial.
I did it a few months ago but found that the majority of people skipped it and thought it was a concept that is already familiar with other apps and is not innovative.
However, the confidentiality function is quite innovative compared to other apps on the market and should really be considered by users.
IMO, it is clearly a UX-In app.

## Javascript – The datable body becomes empty after sorting or searching

After you have created the table body with the .html () function by calling jquery ajax and the search and export do not work, empty the table

var id = \$ ("# userid"). val ();

\$.ajax({
type: "POST",
url: "services/service.php",
data: {cmd:'get_users', id:id },
cache: false,
dataType: 'json',
success: function(res){

//console.log(res);
var html="";
l=res.length;

}
\$('#example tbody').html(html);

}
})

## Why is Angular routerLink (without leading slash) broken when you navigate back to the empty path?

Let's take this basic navigation tree:

Check out my stack flash project.

My routes are

const routes: Routes = (
{
path: "",
component: PageParentComponent,
children: (
{
path: "",
component: PageChildPrimaryComponent
},
{
path: "secondary",
component: PageChildSecondaryComponent
},
{
path: "secondary/deep",
component: PageDeepComponent
}
)
}
);

Why does that happen?

## If \$ a in G \$, is the centralizer of \$ a \$, \$ C (a) \$ not always empty?

I'm pretty sure the centralizer of an item $$a$$ in a group $$G$$ doesn't have to be empty because $$C (a)$$ will always contain the identity element of $$G$$,

Is that true?

Thanks a lot!

Want?

## General topology – positive Borel measurement with an empty support on a measurable standard space

To let $$X$$ be a $$T_0$$ topological space and let $$Sigma_X$$ be the borel $$sigma$$-Algebra. Assume that $$(X, Sigma_X)$$ is a measurable standard room, i. H. measurably isomorphic to Borel $$sigma$$-Algebra $$(Y, Sigma_Y)$$ a completely separable metric space $$Y$$,

Question: Is there a positive measure? $$mu$$ on $$(X, Sigma_X)$$ with empty support, $$mathrm {supp} mu = emptyset$$?

Note that the measurable isomorphism between $$X$$ and $$Y$$ is a priori only measurable for Borel and can possibly map open quantities to quantities without an interior and vice versa.

Thank you very much.