Why am I not able to see the related class in the assistant editor?

I’m trying to display ‘PlayersDetailTableViewCell’ in the assistant editor, but I’m not seeing it as an option – however some of the other files under the same folder show like ‘PlayersDetailViewController’ and ‘Test’.


how to find related sites for commenting?

Dear my all friends,

Actually i want to do blog commenting and forum commenting for any specific topic.
and most of the comment goes into the moderate condition and not approved for long time.

So any one have an idea about that how to find related blog for commenting.

Is there a diagram of related logics?

Proving software is based on logics and there any many logics. AFAIK all of the logics can be shown as a tree diagram of how they are related; for example, a tree of how types of number are releated

enter image description here

Image from: https://byjus.com/maths/real-numbers/

I am looking for a similar diagram for logics.

While I have needed this for many years my current interest is related to

Separation logic is the twenty-first-century variant of Hoare logic that permits verification of pointer-manipulating programs.


javascript – Is there a term or pattern / anti-pattern related to explicitly returning an object within a constructor?

Is this design choice good or bad? Interested in any patterns / anti-patterns involved in writing code like this.

Let’s say I’ve written an Element class that helps me flesh out DOM elements and behavior dynamically and I want to define an instance of Element in its own separate file for code organization purposes.

Let’s say the following call would have more properties than I care to have written out in the current file:

new Element({
    // complex object structure

So instead I have a use method to pass the necessary data to a wrapper class written elsewhere, like so:

const Publisher = require("../manifest/classes/publisher.js")
const ElementsPanel = require("../manifest/components/elements-panel.js")
let publisher = new Publisher()
module.exports = class {
  constructor(env) {
    this.publisher = publisher
    new ElementsPanel().use({
      traits: {
      actions: {
        select: self => {}
      ready: (
        self => {
          console.log("ready triggered")

Where ElementsPanel is a class that contains the settings to generate the desired instance of Element. I could use a function, but createElementsPanel() looks a little less object-oriented to me than new ElementsPanel() and I’m trying to follow an object-oriented design approach. Instead of doThings() I want thing = new Thing(), thing.getDone().

Alternatively requiring the instance itself as an export forces either the instance of Element to be created immediately, or a require call to be used further into the code, and I like to keep my require calls at the top. So this is a style choice.


const Element = require("../../element.js")
module.exports = class {
  constructor() {
    return new Element("div", {
      id: "elements-panel",
      classes: ("hidden"),
      actions: {
        update: (self, voxel) => {
          console.log("elements panel updating with spawned voxel:", voxel)
          if (!self.traits.elements(voxel.element)) {
            self.traits.elements(voxel.element) = {
                // ...
      ready: (
        self => {
          let tickCount = 0
          self.traits.elements = {}
          self.traits.publisher.on("spawn", voxel => {

I like how this looks better than the alternatives I’ve considered, but it uses a class without that class being stateful, and I believe the rule of thumb is to use classes when your object needs to be stateful. The class instead is used here as a syntax style mechanism.

So I’m asking whether what I’m doing here is associated with a common term, pattern, or anti-pattern so I can change it now if necessary before someone sees my code one day and banishes me to developer h*ll.

schengen – COVID related travel requirements for train journey Austria -> Germany -> Netherlands

My wife and I are planning to travel from Austria to the Netherlands on 31st January 2021 via train. Our train journey has two layovers : Frankfurt (~ 50 minutes) and Utrecht (~ 20 minutes).

What exactly are the COVID-19 related requirements (from the German government and the Dutch government) for this train journey?

I tried looking through the official websites of the German government and the Dutch Government, but I couldn’t find clear answers. Any assistance would be greatly appreciated.

Pertinent details:

  1. I am moving to the Netherlands to start a job at an university there.
  2. I hold an Austrian residence permit (and an approval letter for the Dutch residence permit from Dutch Immigration Service (IND))
  3. My wife holds Austrian visa D (and an approval letter for the Dutch residence permit from Dutch Immigration Service (IND))
  4. We haven’t been outside Austria for 2.5 months now.

Thank you.

real analysis – Integral inequality related to increasing functions

Assume $f:(a,b) to mathbb R$ is an increasing function,if $P_n$ is a partition of $(a,b)$ into $n$ equal subintervals,then show that $$0le Uleft(P_{n},fright)-int_{a}^{b}fleft(xright)dxlefrac{b-a}{n}left(fleft(bright)-fleft(aright)right)$$

We have that $$ Uleft(P_{n},fright)=sum_{i=0}^{n-1}M_{i}Delta x_i=frac{b-a}{n}sum_{i=0}^{n-1}f(x_{i+1})$$

Where $Delta x_i=x_{i+1}-x_i=(b-a)/n$ and $M_{i}=sup {f(x):x in (x_{i},x_{i+1})}$
and $P_n=(a=x_0,x_1,…,x_n=b)$

On the other hand:

$$int_{a}^{b}fleft(xright)dx=inf { Uleft(P,fright):P in mathcal P_{(a,b)} }le inf { Uleft(P_n,fright):n in mathbb N^+} le Uleft(P_n,fright)$$

Where $mathcal P_{(a,b)}$ is the set of all partitions of $(a,b)$
which shows that $$ 0le Uleft(P_n,fright) -int_{a}^{b}fleft(xright)dx$$

But how to get the other inequality?

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linux networking – network related commands suddenly stopped working

Debian GNU/Linux 9.12 (stretch) Release: 9.12

Today I realized that a few network related commands suddenly stopped working.
For example: pin, host, iptables, dig and so on, they don’t work anymore.

Here’s the output of route -n, for example

root@host5:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface         UG    0      0        0 ens160 U     0      0        0 ens160
root@host5:~# ping
PING ( 56(84) bytes of data.
--- ping statistics ---
7 packets transmitted, 0 received, 100% packet loss, time 6127ms

ifconfig command output

root@fhost5:~# ifconfig
ens160: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet  netmask  broadcast
        inet6 fe80::250:56ff:fe88:3d72  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:88:3d:72  txqueuelen 1000  (Ethernet)
        RX packets 4581  bytes 910358 (889.0 KiB)
        RX errors 0  dropped 13  overruns 0  frame 0
        TX packets 4562  bytes 417363 (407.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

host IP address:
network segment:

Actually I cannot ping the gateway.
But from another host on the same network segment, the gateway is reachable

I was thinking that the issue is somewhat related to the system …I mean a local issue
All the network commands seem to be stuck
You know I run iptables and nothing happens, the same with host ..etc

root@host5:~# host google.com

Unfortunately I got nowhere.

Any help will be highly appreciated

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