teleren/devto huggingface dataset:
The JavaScript Comma Operator
Tags: javascript, ecmascript
Published: 2021-09-02 09:02:30

---
title: The JavaScript Comma Operator
published: true
description: A brief look at the JavaScript Comma Operator
tags: javascript, ecmascript
series: JavaScript Operators, The Basics
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/wfp8p0f6xeofe49jhd6t.jpeg
---

Comma(,) in JavaScript is mostly used to 'join' other things, like values and expressions. In this usage, the ECMAScript specification refers to it as an [Elision](https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#prod-Elision). Some examples of this usage include, defining/passing multiple arguments to a function, adding items to arrays/objects, and 'one line' variable declarations

![code snippet showing comma usage in JavaScript](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/7xz39cq0k8o6uqu6sznw.png)


Like other symbols in JavaScript, it has another use, as an operator. When used in an expression, it returns the right-most value (or the value of the last expression in the sequence)

Let's test this out. Type the following into your browser console or any JavaScript runtime environment
```
var two = 2

two++, two
// 3
```
You should see `3` returned in the terminal. No surprises there since the compound expression is read from left to right, and all individual expressions will be evaluated before returning the value of the final expression

It's hard to imagine where this could really be useful other than writing shorter lines of code, which could be hard to understand for some people

If you can think of some clever use of the Comma operator, please let me know in the comments

## References and More Reading
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comma_Operator
https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#prod-Elision
react native android NativeUIManager.getConstantsForViewManager('Text') 
Tags: reactnative
Published: 2021-09-02 08:59:15

After I try to run react native android, I get such an error. Who has encountered such a problem?
"NativeUIManager.getConstantsForViewManager('Text') threw an exception. Invariant Violation: Calling synchronous methods on native modules is not supported in Chrome.

 Consider providing alternative methods to expose this method in debug mode, e.g. by exposing constants ahead-of-time."![image](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/qokw3f6xj5m4voj57c2g.png)

react native version
    "react": "17.0.2",
    "react-native": "0.65.1",
A little modification of Actix with a large afford
Tags: rust, actix, modification
Published: 2021-09-02 08:58:27

---
title: A little modification of Actix with a large afford
published: true
description: 
tags: rust,rustlang,actix,modification
//cover_image: https://direct_url_to_image.jpg
---

I want to print a log of unparsed #websocket frames used by #awc 2.0.3. If I used Emacs, I'd only add one line of code. However, using Rust and Actix is not that strangeforward. Besides recompilation, I needed to change Cargo.toml to use local crates. For example, in #awc's Cargo.toml, I changed:

```toml
actix-codec = "0.3.0" 
```

to

```toml
actix-codec = { path = "../../actix-net/actix-codec" }
```

However, after I recompiled the app, this change caused compilation errors because other crates still use different versions of actix-codec. So I changed all affected crates. I ended up modifying six crates as shown in the figure below.

![Dependencies between awc and actix-codec](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/jn6bgsbwabxyvb4ejiyq.png)

Moreover, rustc 1.54.0 does not accept this code below:

```Rust
pub fn as_error<T: ResponseError + 'static>(&self) -> Option<&T> { 
      ResponseError::downcast_ref(self.cause.as_ref()) 
}
```

I presume that a previous version of rustc can. I tried to fix by adding "dyn" as the compiler suggested but it didn't work. So I deleted these three lines. Then rustc 1.54.0 can compile my app and Actix again.

I took too much afford for doing all of these just for printing a little more log. So I wrote this blog out. Maybe I did this in the wrong way. So please suggest to me more proper ways. Or in the worst case, I can read this blog when I forget how did this.
Fix vscodium error "We cannot connect to the Extensions Marketplace at this time, please try again later." on Manjaro / Arch
Tags: linux, archlinux, vscode, manjaro
Published: 2021-09-02 08:52:24

To fix this you need `code-marketplace` package from AUR

**Step 1:** 
Go https://aur.archlinux.org/ and search for `code-marketplace`

![AUR homepage](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/vvrp7vv7qfwhqpko3epn.png)
<br>
**Step 2:**
Copy the Git clone URL
![AUR page of code-marketplace](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/gd5tvhcyz5q68s1x7rom.png)
<br>
**Step 3:**
Open terminal and type this command
```
git clone <URL_You_Have_Copied>
```
![Cloning code-marketplace](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/aq4qyn7iqnbh2odr01uk.png)
<br>
**Step 4:**
Change the current directory
```
cd <package_you_have_cloned>
```
![changing directory](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/rgx8pxj4sv8ksw2nqgvu.png)
<br>
**Step 5:**
Make the package
```
makepkg -si
```
![Making AUR Repository Package](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/bg6prc8cebiudefu5s86.png)
<br>
*This guide is also helpful for those who are looking forward to install a package from AUR Repsitory.*
ETSINDO
Tags: etsindo, buslinks
Published: 2021-09-02 08:44:48

Mod ets2 indonesia yaitu perubahan atau tambahan dari isi games euro truck simulator 2 berada di Directory / Folder Documnets > Euro truck simulator 2 > mod. Kepandaian para pembuat /   mod yang mengantongi produktivitas tinggi hadirlah mod truk atau bus awal nya truk versi europa di edit menjadi bus dan truk Jenis di indonesia. 

Tidak cuma itu, Mod ets2 indonesia untuk menambah kondisi layak nya negara indonesi para   mod juga mengganti hampir 50% dari games asli nya dari mulai truk, bus, traffik, trailer, map dan lain nya   diganti yang disebut MOD.

Euro Truck Simulator  yakni game pc  simulasi truk   dan diterbitkan oleh SCS Software pada tahun 2008. Dalam game pc ini, setiap pemain dapat mengemudi truk selayaknya kita mengemudi melintasi kota-kota di berbagai negara di Eropa tujuan semacam melakukan pekerjaan untuk mengantar barang, dari dirilis pada tahun 2012.

Adanya perkembangan semakin maju terutama di negara indonesia game ets2 indonesia ini jua merupakan salah satu game pc yang banyak di mainkan oleh anak bangsa kita indonesia terutama di daerah saya pulau jawa. Adanya game pc ini salah satu meningkatkan persaudaraan dan silaturahmi ditandai adanya komunitas truk dan bus   di indonesia   BISMANIA dan komunitas lain nya

Euro truck simulator 2 memiliki banyak truk dari 7 pabrikan truk yang berbeda dirilis ulang dengan cermat dalam game pengawasan mitra lisensi memastikan permainan ini harus terasa sama   asli nya truk di dunia real.sebagian kecil upadate   nya samapai hari ini   mencapai ets2 v 1.39 . Euro truck simulator 2 v 1.39 update tambahan pada Map UI,Container, dan Features

Euro Truck Simulator 2 System Requirements
Untuk bisa menjalankan Game ets2 ini pastikan speck pc / laptop anda memenuhi kriteria seperti yang ada dibawah ini baik minimum juga recomendasi

Minimum Requirements

    OS: Windows 7
    Processor: Dual core CPU 2.4 GHz
    Memory: 4 GB RAM
    Graphics: GeForce GTS 450-class
    DirectX®: 10juga
    Hard Drive: 10 GB available space
    Sound: DirectX compatible

Recommended Requirements

    OS: Windows 7 64-bit
    Processor: Quad core CPU 3.0 GHz
    Memory: 6 GB RAM
    Graphics: GeForce GTX 760-class
    DirectX®: 10
    Hard Drive: 10 GB available space
    Sound: DirectX compatible


Sekian sedikit penjelasan terhadap Mod ets2 indonesia, terimakasih   membaca artikel ini, kedepan nya saya akan lanjutkan menulis berhubungan mod ets2 indonesia dari dimulai truk, bus, traffik, trailer, map dan mod pilihan lain nya yang dapat kita nikmati bersama baik itu untuk game simulator ets2 indonesia dan game uk truck simulator indonesia UKTS juga mod game simulator lain nya. terimakasih assalamu alaikum wr.wb
Source : https://www.etsindo.eu.org/
Kill a unresponsive app by using 'xkill'
Tags: linux
Published: 2021-09-02 08:11:42

`xkill` is an easy and powerful alternative to kill an unresponsive window in linux. All you have to do is open terminal > type xkill > hit enter > select the window you want to kill.

![xkill from terminal](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/umgrn2522ektyo5vjpzv.gif)
Circular Queue using python..!
Tags: python, algorithms, webdev, javascript
Published: 2021-09-02 07:35:42

Queue is similar to stack but it follows F.I.F.O method.

Queue can developed by using normal python list and also with linked-list.Here,Queue with linked-list is preferred because time-complexity and space-complexity is good compared to Queue with normal python list.

In Queue with python list, the enqueue and dequeue will end in worst case with increase in inputs.So,the better version of this is circular queue.

Circular Queue is used in Traffic System,Memory Management,CPU Scheduling But here with increase in data's the time-complexity will become worst but space complexity can be reduced with fixed size.So it's always good to implement Queue using linked list if time-complexity is preferred.

We can look into the implementation of Circular Queue in python:
Here we go,
```py
#we need Queue class to initialize fixed empty list with start and top
class CircularQ:
    def __init__(self,maxSize):
        self.data = maxSize *[None]
        self.maxSize = maxSize
        self.start = -1
        self.top = -1
    def __str__(self):
        return str(self.data)
    
    def isEmpty(self,value):
        if self.top and self.star == -1:
            return True
        else:
            return False
    
    def isFull(self):
        if self.top+1 == self.maxSize and self.start == 0:
            return True
        elif self.start+1 == self.top:
            return True
        else:
            return False
    
    def insert(self,value):
        self.top+=1
        self.data[self.top] = value
        self.start=0

    def delete(self):
        first = self.data[self.start]
        start = self.start
        
        if self.start == self.top:
            self.start =-1
            self.top=-1
        
        elif self.start+1 == self.maxSize:
            self.start = 0
        
        else:
            self.start+=1
        self.data[start] = None
        return first



circular = CircularQ(5)
circular.insert(1)
circular.insert(2)
circular.insert(3)
circular.insert(4)
circular.insert(5)
circular.delete()
circular.delete()
print(circular)
```



Thank You,
I hope everyone will have a good health and a better future...!!

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Next Level JavaScript
Tags: node, javascript, cpp, webdev
Published: 2021-09-02 07:21:37



![](https://images.pexels.com/photos/1261427/pexels-photo-1261427.jpeg?cs=srgb&dl=pexels-hitesh-choudhary-1261427.jpg&fm=jpg)

### A lot of people have worked with JavaScript, but we still tend to overlook and underestimate how powerful JS really became with time.


 The language came to life in 1995 and for a long time it was wildly used solely for web development.

Though, when Nodejs came to town EVERYTHING changed and it rapidly became the most used languace thanks to it's incredible features.

### Now how can we take advantage of all the goodness nodejs has to offer??



Me and a friend tried our best to showcase it in a library we created : https://github.com/reqorg/reqless . It is called reqless and was created via low level networking in c++ and was binded to js using [Napi](https://nodejs.org/api/n-api.html) , this will enable us to create advanced features in c++ and use them in JS and also increase their speed.

If you like Rust, you can use [wasm-bindgen](https://rustwasm.github.io/docs/wasm-bindgen/introduction.html) .

This is only one breeze of what nodejs is capable , you should also check out the incredible [nodejs child processes](https://nodejs.org/api/child_process.html) , which helped in a lot of projects (even building a discord bot capable of running cpp code in a sanboxed environment) . And if you are doing more backend and power hungry stuff you should also check out multithreading in js !

##### I really like to keep it simple and not waste too much of your time , so for now, Thanks for your time :)
A call for developers to contribute to cryptocurrency project
Tags: blockchain, cryptocurrency, earn, programming
Published: 2021-09-02 06:59:46

If you’ve been into the tech world (developers to be exact), you must know about the thenewboston youtube channel. The channel has helped millions of people to get into the programming world (including myself). After the break of 4 years from youtube, Bucky (the founder of thenewboston and tutor himself) came back with an announcement of a blockchain project, TNBC.

#### What is this call for?
We’re calling you to contribute to the project and build on the TNBC ecosystem.

#### What’s the full form?
thenewboston Coins

#### Is it an ECR20 token?
No, the community is building its blockchain.

#### What’s unique in TNBC?
The distribution model itself is unique as all distributed coins reward contributions that add value to the network and/or the community rather than the miners. https://thenewboston.com/faq/all#coins-distribution

The governance structure enables voting for all core aspects of the network. https://thenewboston.com/developer/whitepaper/principal-entities#principal-entities-governance

The project is community-driven with contributors all around the world.

#### How do I earn TNBC?
You can earn TNBC through contribution to the project. You can either pick up tasks from the task page https://thenewboston.com/tasks/All or create an issue/ pull-request on various official repositories. 

Have a cool project in mind? You can submit a project proposal. https://thenewboston.com/developer/projects/rules

#### What’s the stage of the project?
We’re moving to the beta stage of the project. Here's the latest video update: https://www.youtube.com/watch?v=lkxImLezLs4

It was announced around a year ago through the youtube video “Hello World”. https://www.youtube.com/watch?v=D-3i1g5YFik

#### Is there a roadmap?
The beta roadmap is available here: https://thenewboston.com/roadmap

#### Is there going to be an ICO?
No. There hasn’t been an ICO and there will never be one.

#### How do I join the community?
Github: https://github.com/thenewboston-developers
Reddit: https://www.reddit.com/r/thenewboston/
Discord: https://discord.gg/thenewboston

#### Who am I?
I’m one of the contributors to the TNBC cryptocurrency project.
SQL : Sequences
Tags: sql, database, programming
Published: 2021-09-02 06:51:21

This guide is for PostgreSQL : https://www.postgresql.org/

Getting Started with PostgreSQL : 
https://dev117uday.gitbook.io/databases/sql/getting-started

Loading Sample Data Guide : 
https://dev117uday.gitbook.io/databases/sql/getting-started/load-data

### Sequences

* Specify datatype \( `SMALLINT | INT | BIGINT` \)
* Default is `BIGINT`

### List all sequence

```sql
SELECT relname AS seq_name 
    FROM pg_class WHERE relkind = 'S';
```

```sql
CREATE SEQUENCE IF NOT EXISTS test_sequence AS bigint;

SELECT NEXTVAL('test_sequence');

 nextval 
---------
       1


SELECT CURRVAL('test_sequence');

 currval 
---------
       1

SELECT SETVAL('test_sequence',3);

 setval 
--------
      3


-- set this value after the nextval is called, 
-- check using the currval cmd
SELECT SETVAL('test_sequence',300,false);

-- CHECKING CURRENT VALUE 
SELECT CURRVAL('test_sequence');
 currval 
---------
       3


ALTER SEQUENCE test_sequence RESTART WITH 100;

SELECT NEXTVAL('test_sequence');
 nextval 
---------
     100

CREATE SEQUENCE IF NOT EXISTS test_seq3
INCREMENT 50
MINVALUE 100
MAXVALUE 1000
START WITH 150;

SELECT nextval('test_seq3');

  nextval 
---------
     150

CREATE SEQUENCE IF NOT EXISTS seq_des
INCREMENT -1
MINVALUE 1
MAXVALUE 999
START 99
NO CYCLE | CYCLE ;

SELECT nextval('seq_des');

 nextval 
---------
      99

-- DROP SEQUENCE

DROP SEQUENCE IF EXISTS seq_des;

CREATE TABLE IF NOT EXISTS table_seq (
    id INT primary key ,
    name VARCHAR(10)
);

CREATE sequence IF NOT EXISTS table_seq_id_seq
start with 1 owned BY table_seq.id;

ALTER TABLE table_seq
ALTER COLUMN id SET DEFAULT nextval('table_seq_id_seq')
```

### Alpha-Numeric Sequence

```sql
CREATE sequence table_text_seq;

CREATE TABLE contacts (
    id text NOT null default ('ID' || nextval('table_text_seq')),
    name VARCHAR(150) NOT null
);

INSERT INTO  contacts (name) VALUES ('uday 1'),('uday 2'),('uday 3');

SELECT * FROM contacts;

 id  |  name  
-----+--------
 ID1 | uday 1
 ID2 | uday 2
 ID3 | uday 3
```
12 Best Data Analytics Courses in Coursera- [Bestseller 2021]
Tags: datascience, analytics, analyst, python
Published: 2021-09-02 06:44:33

**Coursera** is an **E-Learning** platform and provides thousands of online courses on various subjects. And **Coursera** has a wide range of **Data Analytics courses** too. That’s why I thought to share the **12 Best Data Analytics Courses in Coursera** with you. So, give your few minutes to this article and find out the Best Data Analytics Courses in Coursera.

Now without any further ado, let’s get started-

**[Click to continue reading...](https://www.mltut.com/best-data-analytics-courses-in-coursera/)**
PAAS: New Face In the Field Of Mobile Application Development
Published: 2021-09-02 06:41:09

Cloud computing is the latest and most popular trend in the IT world that has provided the base for new ideas and innovations. But how cloud computing would be the future of mobile application development? What is PAAS? Is someone still working on it? Why it is the hottest query among the app developers? What is the scope of this technology? These all questions incorporated with many more will be answered in the later section of this post.

Had you ever tried to figure out the concept behind the web-based email services like Gmail, Yahoo Mail, Hot Mail and many more? Believe it or not but you are using the facility of cloud computing since a long time. Confused? Actually these all web based email service providers use the concept of cloud computing as the data of the all the users is saved on a common database. Providing a common platform for all the users to work, store and share the data; this is simply the magic of cloud computing.

![Alt text of image](https://cdn.pixabay.com/photo/2021/08/04/13/06/software-developer-6521720_960_720.jpg)

**Trend Of Mobile Application Development**

Mobile application development is surely at the golden phase of success and this phase is predicted to last long. The market experts had predicted that the mobile app development [https://jatapp.com/services/mobile-app-development/](https://jatapp.com/services/mobile-app-development/) projects will dominate the native PC projects with the ratio of 4:1 by the year 2015. This amazing growth of mobile application development will provide more opportunities to the app developers.

The world of App development is refined and offered with much advanced technologies on a regular interval so as to make it simpler and hassle free. But what is the major out of box trend which is expected to change the definition of App development?

##What is PAAS?

PAAS or ‘Platform As A Service’ is part of cloud computing which allows different subscribers to share the hardware, Software, Operating System, Storage and Network Capacity over the internet. PAAS is a very useful technology for the mobile application developers as it accelerates the development process, allow different developers to work on the same platform and cut down the cost as well.

**Scope Of PAAS?**

If you are worried about the Scope of PAAS then these data figures will surely boost the confidence. PAAS is predicted to grow around 235 % in the session 2016-2020; around 52% of the mobile developers are planning to adopt PAAS; What more? The total market size of PAAS was 512 million dollars in 2018 and which is expected to jump to $1.7 Billion in 2019.

###Conclusion

PAAS is surely the future of mobile application development; if you have any query regarding the topic then we are waiting to assist you. Appschopper is the uncrowned king in the world of Mobile Application development; our expertise services are always integrated with the latest technology trends.
All about WebGPU
Tags: webgpu, webgl, graphics
Published: 2021-09-02 06:30:28

## What is Web GPU?
To understand Web GPU, first, we have to step back and understand what Web GL is. Web GL project started in 2009. Web GL is based on OpenGL (Open Graphics Library) which itself is a software interface to graphics hardware. Web GL is a project that helps you interact with the graphics hardware directly from your browser with the help of Open GL. So before 2009, it was not possible to interact with the GPU by your JavaScript from the browser. So to interact with the Graphics hardware on your computer, you must have Open GL on your computer.

## Problem with Web GL
But Windows uses DirectX API to access graphics hardware, so Web GL can't function without Open GL. Therefore Web GL can't be accessed on Windows computers. So the problem here was that Web GL couldn't access DirectX to communicate with the Graphics Hardware. So if you were using a Windows computer, then Web GL must take the help of a software called ANGLE (which acts as a middle man between the Open GL and the windows kernel) to contact the graphics hardware. So now we have a performance hit as now we have had a middle man to access the hardware. So it could be swift if it was possible to communicate with the GPU directly.

## Introduction to Vulkan
To fix a middle man problem, a newer standard was developed named "Vulkan". Vulkan has even lower-level access to the graphics hardware so that now it can help build more features with better performance as well.
![image](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/7exfljh2wwqtzchb2mno.png)
Vulkan is faster compared to both Open GL and DirectX, and it is cross-platform as well. So now we have a better standard developed to access the GPU. Now we need a way to access the Vulkan from the browser. This is where Web GPU comes into play.
![image](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/12p49n6nrii4nnnf4b5x.png)
Vulkan is a performance beast. The process of communicating the graphics hardware is much faster than ever before.

## Support for Web GPU
Chrome has already shipped Web GPU as an experimental feature and will most probably be shipped to use from the Chrome 98 version.
![image](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/fhzp8t2obd40mp112eaw.png)
Now the 3D games can directly run on the computer rather than running on a remote server and sending the data. This may be helpful for running the ML algorithm directly on the client and send the data. This will be a game-changer in the privacy world right now as crucial data need to leave the client's computer.

This is a significant milestone for the future of the Web. The Web GPU may create more promising opportunities for browser gaming and many more applications.

You can watch the YouTube video the blog [here](https://www.youtube.com/watch?v=cnHu2LJPDhw).