teleren/devto huggingface dataset:
Explanation of React JS hook!
Tags: beginners, react, javascript, frontend
Published: 2023-05-10 18:38:26

React Hooks are functions that allow you to use state and other React features in functional components. Hooks were introduced in React 16.8 and provide a way to reuse stateful logic across multiple components.

Here are some commonly used React Hooks:

1. useState: This hook allows you to add state to your functional components. It takes an initial state value and returns an array with two elements: the current state value and a function to update that state value.

2. useEffect: This hook allows you to perform side effects in your components, like fetching data or subscribing to events. It is called after every render of the component and takes a function as its argument.

3. useContext: This hook allows you to consume a context that you have created using the `React.createContext` function.

4. useRef: This hook allows you to create a reference to a DOM element or a value that persists between renders.

5. useCallback: This hook allows you to memoize a function so that it is only re-created when its dependencies change.

6. useMemo: This hook allows you to memoize a value so that it is only re-calculated when its dependencies change.

7. useReducer: This hook allows you to manage state in more complex scenarios, where you need to update state based on previous state or perform actions based on state changes.

8. useStateContext: This is a custom hook that allows you to use state and dispatch from a context provider. It is usually used with the `useReducer` hook and allows you to create more complex state management systems.

These are just a few of the many hooks available in React. By using hooks, you can create more powerful and reusable components in your React applications.
Implement circuit breaker in Javascript
Tags: javascript, interview, webdev, programming
Published: 2023-05-10 18:06:05

In software development, a circuit breaker is a design pattern used to prevent a service from becoming overwhelmed or failing in the event of an error or too much traffic. It acts as a safety valve that stops the flow of traffic to a service when it detects an error or a high number of requests.

In JavaScript, a circuit breaker can be implemented by creating a wrapper function around the code that is prone to failure or high traffic. The wrapper function monitors the number of errors or requests and determines whether to allow traffic to pass through to the original function.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/pxpb3ff84k0xgetoc6lw.png)

```typescript
function circuitBreaker(originalFunction, 
failureThreshold, recoveryTime) {
  let failureCount = 0;
  let lastFailureTime = null;
  let isOpen = false;

  return function(...args) {
    if (isOpen) {
      const timeSinceFailure = new Date() - lastFailureTime;
      if (timeSinceFailure > recoveryTime) {
        isOpen = false;
      } else {
        throw new Error('Service is unavailable');
      }
    }

    try {
      const result = originalFunction(...args);
      failureCount = 0;
      return result;
    } catch (error) {
      failureCount++;
      lastFailureTime = new Date();

      if (failureCount >= failureThreshold) {
        isOpen = true;
      }

      throw error;
    }
  };
}

```

This function takes three parameters: the original function that we want to wrap, the failure threshold (the number of allowed failures before the circuit breaker is triggered), and the recovery time (the amount of time to wait before trying the original function again).

The circuit breaker function returns a new function that acts as a wrapper around the original function. The wrapper function checks if the circuit is open, and if it is, it either throws an error or waits for the recovery time to expire before allowing traffic through again. If the circuit is closed, the wrapper function calls the original function and catches any errors. If the number of errors exceeds the failure threshold, the circuit is opened, and traffic is stopped from passing through until the recovery time has passed.

To use this circuit breaker, we can pass our original function to the circuitBreaker function along with the desired failure threshold and recovery time:

For more frontend interview questions, can download this ebook - https://mohit8.gumroad.com/l/ygass
"From Customer Service to Code": CodeNewbie Podcast S24E1
Tags: podcast, codenewbie, beginners, career
Published: 2023-05-10 18:24:56

In our first episode of Season 24 of the CodeNewbie Podcast, @saronyitbarek talks about building a personal brand, cultivating a positive tech mindset, and how to propel your professional career with [Tae'lur Alexis](https://twitter.com/TaelurAlexis?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor), freelance Software Development Consultant. 

{% embed https://www.codenewbie.org/podcast/from-customer-service-to-cybersecurity %}

Tae’lur Alexis is a self taught software developer, application security enthusiast and content creator. Her mission is to help people with non traditional backgrounds break into tech. Tae'lur sits down with Saron to talk about her coding journey going from fast food to tech and the habits and tips she has learned to get to where she is today.

- [Listen on Apple Podcasts](https://podcasts.apple.com/us/podcast/codenewbie/id919219256?i=1000612464970)

- [Listen on Spotify](https://open.spotify.com/episode/0sck3VtXMi8GlrtZqUPRUH?si=b2c32e35e0dd4d16)

Or, listen wherever you normally get your podcasts!

***

**Make sure to subscribe to the CodeNewbie podcast if you haven't yet!**

Happy coding! We hope you enjoy this season of the CodeNewbie Podcast 💜
Diff form Two Arrays
Tags: codenewbie, javascript, algorithms, beginners
Published: 2023-05-10 18:02:10


### DESCRIPTION:

Compare two arrays and return a new array with any items only found in one of the two given arrays, but not both. In other words, return the symmetric difference of the two arrays.

### Examples

```js
[1, 2, 3, 5], [1, 2, 3, 4, 5]
// should return [4].

[1, "calf", 3, "piglet"], [1, "calf", 3, 4]
// should return ["piglet", 4].
```

### My approach for solving this problem:

> - concat the 2 arrayes.
> - add every item into new obj 
> - if it's unquie get vlaue of 1 and get 2 if it's not.
> - if not return sliced str with num length.
> - filter item with value of 1 then map the number.

### My solution:

```js
function diffArray(arr1, arr2) {
    let newArr = arr1.concat(arr2)
    let numObj = {}
    newArr.forEach((item)=>{
      numObj[item] = numObj[item] ? numObj[item] +1:1
    })
  
    return Object.keys(numObj)
    .filter((item)=>{
      return numObj[item] == 1
    })
    .map((num)=>{
      if(!isNaN(num)){
          return +num
      }
      return num
    })
  }
  
  diffArray([1, "calf", 3, "piglet"], [1, "calf", 3, 4]);
```

### freeCodeCamp approach for solving this problem:
> - concat the 2 arrays.
> - filter if item includes in arr1 or arr2 and return him.

### freeCodeCamp solution:

```js
function diffArray(arr1, arr2) {
  return arr1
  .concat(arr2)
  .filter(item => !arr1.includes(item) || !arr2.includes(item));
}

diffArray([1, "calf", 3, "piglet"], [1, "calf", 3, 4]);
```

> Any tips or edit are most welcome. share it with me on the comments. Thanks for being here!

#### Follow _Muhmmad Awd_ on 
<a href="https://www.linkedin.com/in/muhmmadawd"><img src="https://img.shields.io/badge/LinkedIn-0077B5?style=for-the-badge&logo=linkedin&logoColor=white"/></a>

<a href="https://github.com/MuhmmadAwd"><img src="https://img.shields.io/badge/GitHub-100000?style=for-the-badge&logo=github&logoColor=white"/></a>

If you have any questions or feedback, please feel free to contact me at 
<a href="muhmmad.awd@gmail.com"><img src="https://img.shields.io/badge/Gmail-D14836?style=for-the-badge&logo=gmail&logoColor=white"/></a>
CSS Selectors for Web developer
Tags: css, webdev, css3
Published: 2023-05-10 17:37:03

## CSS selectors 

1 Element Selector

```
h3 {
    /* write your css */ 
}
```
2 Id Selector

```
#head {
    /* write your css */ 
}
```

3 Class Selector

```
.head-title {
    /* write your css */ 
}
```

4 Attribute Selector

```
ol[type="a"] {
  /* write your css */ 
}
```

5 Descendant Selector

```
div .card-title {
   /* write your css */ 
}
```

6 Universal Selectors

```
* {
  /* write your css */ 
}
```

7 Nth type of Selector

```
div:nth-of-type(2) {
  /* write your css */ 
}
```

8 Pseudo-class Selector
```
*The syntax of pseudo-class:*
selector:pseudo-class {
  property: value;
}
```
Example:
```
a:hover {
  /* write your css */
}

```
Understanding Databases: Components, Types, and Benefits
Published: 2023-05-10 17:31:18

What is a Database?
A database is an organized collection of data that is stored electronically. Databases are designed to manage large amounts of data efficiently, making it easy to retrieve, update, and delete information. Databases are used by organizations of all sizes to store and manage critical data related to their business operations.
Databases come in different types, each designed to serve a specific purpose. The most common types of databases are:
1. Relational databases: These databases store data in tables and use a structured query language (SQL) to manage and manipulate data.
2. NoSQL databases: These databases store data in a non-tabular format and provide a flexible data model that can handle unstructured and semi-structured data.
3. Object-oriented databases: These databases store data in objects, making it easier to work with complex data structures.
4. Graph databases: These databases store data in a graph format, making it easier to manage and analyze relationships between data.
Components of a Database:
A database consists of several components that work together to manage and store data. These components include:
1. Tables: Tables are the primary component of a database. They contain data organized in rows and columns.
2. Fields: Fields are the columns in a table. They define the type of data that can be stored in each column.
3. Records: Records are the rows in a table. They contain a set of related data.
4. Indexes: Indexes are used to improve the performance of database queries. They provide a quick way to locate specific data within a table.
5. Queries: Queries are used to retrieve data from a database. They allow you to filter, sort, and manipulate data.
6. Reports: Reports are used to present data in a readable format. They allow you to summarize, group, and visualize data.
Why are Databases Important?
Databases are essential for managing large amounts of data efficiently. They provide a centralized location for storing and retrieving data, making it easier to access and manipulate information. Databases also provide several benefits, including:
1. Data Consistency: Databases ensure that data is consistent across multiple applications and users.
2. Data Security: Databases provide a secure way to store sensitive data and control access to that data.
3. Data Integrity: Databases ensure that data is accurate and complete.
4. Scalability: Databases can handle large amounts of data and can scale to meet the needs of growing organizations.
5. Data Analysis: Databases allow organizations to analyze data and gain insights into their business operations.
Conclusion:
In this blog, we have discussed what a database is and the different types of databases. We have also explored the components of a database and the benefits of using a database to manage data. Databases are essential for organizations of all sizes to manage and store critical data related to their business operations. By using a database, organizations can improve data consistency, security, integrity, scalability, and analysis.
Troubleshooting and Increasing Gunicorn Timeout in a Django Application
Tags: django, webdev, gunicorn, ubuntu
Published: 2023-05-10 17:26:10

# Troubleshooting and Increasing Gunicorn Timeout in a Django Application

## Introduction
In this article, we will go through the process of troubleshooting and resolving a Gunicorn worker timeout issue in a Django application. We will cover how to locate the Gunicorn configuration, increase the timeout value, and apply the changes to the running service.

## Problem
A Django application was running on an Ubuntu server using Gunicorn. The application was working fine locally, but on the server, it experienced a worker timeout issue.

## Solution
To resolve the worker timeout issue, we increased the Gunicorn timeout value. Here's a step-by-step guide on how we did it:

1. **Locate the Gunicorn configuration file:**
   We searched for the Gunicorn configuration file using the `find` command. In this case, the configuration was contained within the systemd service file itself, rather than in a separate configuration file.

2. **Update the timeout value in the Gunicorn configuration:**
   We modified the `ExecStart` line in the service file to include the `--timeout` option and set the desired timeout value (e.g., 120 seconds).

   Example configuration:
 

```
[Service]
User=dev
WorkingDirectory=/home/dev/django_app

ExecStart=/home/dev/prod/django_app/bin/gunicorn
--access-logfile -
--workers 3
--timeout 120
--bind unix:/run/gunicorn.sock
django_project.wsgi:application
```



3. **Reload the systemd configuration and restart the Gunicorn service:**
After updating the service file, we reloaded the systemd configuration and restarted the Gunicorn service with the following commands:

```
sudo systemctl daemon-reload
sudo systemctl restart gunicorn
```


## Conclusion
By increasing the Gunicorn timeout value, we successfully resolved the worker timeout issue in the Django application. This process can be applied to other similar situations where a Gunicorn worker timeout is causing problems in a Django application. Remember to adjust the timeout value according to your requirements and optimize your application to prevent such issues in the future.
Sloan's Inbox: How Do Badges Work on DEV?
Tags: discuss, meta
Published: 2023-05-10 16:40:22

Hey there! It's Sloan, your friendly neighborhood DEV Moderator 🦥

As I lazily scrolled through my inbox earlier today, I stumbled upon a message from a fellow DEV member asking about how badges work on DEV.

So, why not take a peek into my inbox for a fresh online advice column and discussion hosted by yours truly? Every week (or so), I'll be diving into the questions, comments, and thoughts of my fellow sloths.

---

### Today's question is:

> How long does it take for our badges to be updated on our profile when we participate in an event or earn an achievement — for example, Top 7 and WeCoded?

This is a great question! I reached out to my human colleague @devencourt for an answer, and here's what they said:

> Top 7 badges are awarded when the post is published on DEV. If they don't have their Top 7 badge after being featured, they can email us for it, might be an error.

> Hackathon and badges are awarded once the winners are announced. 

> Other event badges should be awarded within a week of the event closing.

Thanks, Brian!

I will add that if you're missing any badge you think you should have, please email us at yo@dev.to and let us know which badge you're missing. That way, we can be sure to fix it for you.

Thanks for asking, anonymous friend! I love badges on DEV as much as you do, so it's important that we get you the right ones to make your profile shine 🌟

---

_Want to submit a question for discussion or ask for advice? [Visit Sloan's Inbox](https://docs.google.com/forms/d/e/1FAIpQLSc6wgzJ1hh2OR4WsWlJN9WHUJ8jV4dFkRDF2TUP32urHSAsQg/viewform)! You can choose to remain anonymous._
How to create a virtual machine scales set with load balancer
Published: 2023-05-10 16:32:35


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/m6oo0q6dmodq36bmbx0d.png)

**Azure Virtual Machine Scale Sets** let you create and manage a group of load balanced VMs. The number of VM instances can automatically increase or decrease in response to demand or a defined schedule.

**Azure Load Balancer** is a high-performance, ultra low-latency Layer 4 load-balancing service (inbound and outbound) for all UDP and TCP protocols. It is built to handle millions of requests per second while ensuring your solution is highly available.

Step 1:
Visit portal.azure.com, login or sign up if you don't have an account, you can get a free account at azure.microsoft.com/en-us/free/

Step 2:
Search for virtual machine scale sets aand click on "create"

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ddh44vssgu705elyafhb.png)

Step 3:

1. Subscription: Choose the subscription where you wish to create the resource.
2. Resource group: Choose the resource group where you wish to create the resource. If you wish to create a new group click on create a new option.
3. Virtual machine scale set name: Enter a preferred unique name.
4. Region: Select the location where you wish to create the account.
5. Image: Choose windows because we're creating a scale set windows VM.
6. Username: azureuser
7. Password: Password12345

Click on "review+create"

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/uuv4u7iixgj64lmd7hl8.png)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/yj864nmfkj38inhvdugq.png)

Step 4:
Go to "networking" to configure load balancer. Leave the virtual network as default that azure has chosen for us.
 We're using a load balancer because if you're creating a scale set, that means you're having an additional VM to support what you already have to be able to distribute traffic to the VM.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/i39ruk5zvv8tcsoordk7.png)

Step 5:
Go to "health" and Enable application health monitoring, then click on "review and create"

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/yovl8n0m1fwzspl7j8r1.png)

Step 6:
Click on "create", then "go to resource"

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5q1abekcuczkphjmez1y.png)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/e7xxqwtpy18lajcdv1k8.png)

Step 7:
Click on "instances" to know if your scale sets running

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ljea2tb4sv9lz3zvjo5n.png)

Step 8:
Click on scaling to either choose manual scaling(to mainatain a fixed instance count) or custom autoscale(if you want everything to be done automatically using certain number of conditions to choose a time range)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/gfs4fg0by0utf0tv2i97.png)

Thank you for reading...
Setting up Svelte-Inspector with VS Code + WSL
Published: 2023-05-10 16:30:27

Just ran into some issues while setting up the updated [svelte-inspector](https://github.com/sveltejs/vite-plugin-svelte/blob/main/docs/config.md#inspector) vite plugin on my SvelteKit app I'm developing on Windows with WSL (Windows Subsystem for Linux). Figured I wouldn't be the only one to have this issue so here is a quick way to solve it!

## Guide

**Setup Svelte Inspector**

For SvelteKit inside your `svelte.config.js` file add this:

```JavaScript
//in svelte.config.js
const config = {
  // ...
  vitePlugin: {
     inspector: true,
  },
}
```

**Add EDITOR config in your settings.json**

In your VS Code settings file (`settings.json`) add the following:

```JSON
"terminal.integrated.env.linux": { 
   "EDITOR": "code" 
}
```

**That's it, you should now be able to use the svelte-inspector tool with your WSL VS Code editor!**

To use it just start your dev server and open up your project in the browser. Then use the default key combo <kbd>Ctrl</kbd> + <kbd>Shift</kbd>


![Image showing svelte inspector working on a skelton sveltekit project](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/fpyfdtob38nz5636y5bo.png)




## References

* [https://github.com/yyx990803/launch-editor/issues/16](https://github.com/yyx990803/launch-editor/issues/16)
60 berufliches Vorwärtskommen: Werbung fürs Reifen der Karriere-Kultur.
Tags: deutsch, career, motivation, discuss
Published: 2023-05-10 15:56:00

Moin Moin,

ich suche ab sofort Software-Entwickler, IT-Abteilungen und insbesondere dich zu gewinnen fürs reifen der Karriere-Kultur in der IT im deutschsprachigen europäischen Raum. Wie dies aussehen kann, wurde im [vorherigen Beitrag→](https://dev.to/amustafa16421/59-berufliches-vorwartskommen-wie-sieht-eine-reife-karriere-kultur-bei-software-entwicklern-aus-k2f) gezeigt.

Es scheint mir als hätten wir hier, zum Zeitpunkt der Veröffentlichung des Beitrags, noch einiges vor uns:
- emotionale Intelligenz als Teil unserer Fortbildung
- Projektverwaltung ohne Überstunden
- Karriere-Plan
- Zusammenarbeit in der Karriere-Gestaltung
- Gehalt und Vergütungsmodelle
- Gesellschaftsverantwortung
- Eigenverantwortung, auch für die Verbesserung der Karriere-Kultur


1) Denkst du, dass wir Software-Entwickler unsere Karriere-Kultur, wie oben gezeigt, weiterentwickeln sollten? ( 5-Sterne-Maß ), 
Ausführungen willkommen.

Lass uns mittels Kommentaren austauschen.

Beste Grüße,
Mustafa

Austausch mittels E-Mail: mustafa.kevin.dwenger@posteo.de
Betreff: Austausch
List Methods of Python
Published: 2023-05-10 15:54:34



### 1. append() :-
It add the element in the last of the list.
example:-
```
>>> alist=[]
>>> alist.append(1)
>>> alist.append(2)
>>> alist.append(3)
>>> alist
[1, 2, 3]
```

### 2. clear() :-
It delete all the elements of the list.
example:
```
>>> alist.clear()
>>> alist
[]
```

### 3. copy() :-
It returns a copy of a list.
example:-
```
>>> alist.append(1)
>>> alist.append(2)
>>> alist.append(3)
>>> blist=[]
>>> blist=alist.copy()
>>> blist
[1, 2, 3]
```

### 4. count()	:-
it counts the number of a elements present in a list
example:
```
>>> blist=[1, 2, 3, 1]
>>> blist.count(1)
2

```

### 5. extend() :-
It add the elements of a list in the end of a new list. 
example:
```
>>> alist.extend(blist)
>>> alist
[1, 2, 3, 1, 2, 3]

```
### 6. index() :-
It returns the index of a first occurance of a specified value in a list.
example:
```
>>> alist.index(2)
1
```

### 7. insert() :-
It insert a element at a specified index position.
example:
```
>>> alist.insert(-1,4)
>>> alist
[1, 2, 3, 1, 2, 4, 3]
```

### 8. pop() :-
It removes the last element or the element on the given index.
example:
```
>>> alist.pop(-2)
4
>>> alist
[1, 2, 3, 1, 2, 3]
>>> alist.pop()
3
>>> alist
[1, 2, 3, 1, 2]
```

### 9. remove() :
It removes the first occurance of the specified element in a list.
example:
```
>>> alist.remove(3)
>>> alist
[1, 2, 1, 2, 3]
```

### 10. reverse() :-
It reverses the order of the list.
example:
```
>>> alist.reverse()
>>> alist
[2, 1, 3, 2, 1]
```

### 11. sort() :-
It sorts the order of a list.
example:
```
>>>alist.sort()
>>>alist
[1, 1, 2, 2, 3]
```
## References
GeeksforGeeks
W3Schools
freecodecamp