teleren/devto huggingface dataset:
Python - Consider Divide and Conquer for Complex Problem Solving
Tags: python, algorithms, programming, tutorial
Published: 2023-11-30 15:30:00

The Divide and Conquer technique is a powerful strategy for solving complex problems by breaking them down into smaller, more manageable subproblems. It typically involves three steps: divide, conquer, and combine. This approach often leads to efficient algorithms with lower time complexity. Here's an example:

**Example - Merge Sort in Python using Divide and Conquer:**

```python
def merge_sort(arr):
    if len(arr) <= 1:
        return arr

    # Divide: Split the array into two halves
    mid = len(arr) // 2
    left_half = arr[:mid]
    right_half = arr[mid:]

    # Recursively sort each half
    left_half = merge_sort(left_half)
    right_half = merge_sort(right_half)

    # Conquer: Merge the sorted halves
    sorted_arr = merge(left_half, right_half)

    return sorted_arr

def merge(left, right):
    merged = []
    i = j = 0

    while i < len(left) and j < len(right):
        if left[i] < right[j]:
            merged.append(left[i])
            i += 1
        else:
            merged.append(right[j])
            j += 1

    merged.extend(left[i:])  # Append remaining elements from left
    merged.extend(right[j:])  # Append remaining elements from right

    return merged

# Example usage:
my_list = [38, 27, 43, 3, 9, 82, 10]
sorted_list = merge_sort(my_list)
print(sorted_list)  # Output: [3, 9, 10, 27, 38, 43, 82]
```

In this example, we implement the Merge Sort algorithm using the Divide and Conquer technique. The array is divided into two halves, recursively sorted, and then merged together. Merge Sort's time complexity is O(n log n), making it an efficient sorting algorithm for large datasets.

Divide and Conquer can be applied to various problem domains, such as sorting, searching, and divide-and-conquer algorithms like quicksort and binary search. It's a powerful approach for efficiently solving complex problems by breaking them down into simpler subproblems.
Socket.io Simple Chat App
Tags: javascript, node, webdev, beginners
Published: 2023-11-30 15:23:29

Creating a real-time chat app with Socket.io and JavaScript involves both server-side and client-side implementation. Below, I'll guide you through creating a simple chat application using these technologies.

**Prerequisites:**

- Node.js installed on your machine.

**Step 1: Set Up Your Project**

1. Create a new directory for your project.

```
mkdir socketio-chat-app
cd socketio-chat-app
```

1. Initialize your project with npm.

```
npm init -y
```

1. Install necessary dependencies.

```
npm install express socket.io
```
**Step 2: Create Server-Side Code**
Create a file named server.js for the server-side code.

```
// server.js
const express = require('express');
const http = require('http');
const socketIO = require('socket.io');

const app = express();
const server = http.createServer(app);
const io = socketIO(server);

app.use(express.static(__dirname + '/public'));

io.on('connection', (socket) => {
  console.log('A user connected');

  // Listen for chat messages
  socket.on('chat message', (msg) => {
    io.emit('chat message', msg); // Broadcast the message to all connected clients
  });

  // Listen for disconnection
  socket.on('disconnect', () => {
    console.log('User disconnected');
  });
});

const port = process.env.PORT || 3000;
server.listen(port, () => {
  console.log(`Server listening on port ${port}`);
});
```
**Step 3: Create Client-Side Code**
Create a directory named public in your project and inside it, create an HTML file index.html.

```
<!-- public/index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Socket.io Chat App</title>
  <script src="https://cdn.socket.io/4.0.1/socket.io.min.js"></script>
</head>
<body>
  <ul id="messages"></ul>
  <form id="form" action="">
    <input id="m" autocomplete="off" /><button>Send</button>
  </form>

  <script>
    const socket = io();

    // Listen for chat messages
    socket.on('chat message', (msg) => {
      const messages = document.getElementById('messages');
      const li = document.createElement('li');
      li.textContent = msg;
      messages.appendChild(li);
    });

    // Send chat messages
    document.querySelector('form').addEventListener('submit', (e) => {
      e.preventDefault();
      const input = document.getElementById('m');
      if (input.value) {
        socket.emit('chat message', input.value);
        input.value = '';
      }
    });
  </script>
</body>
</html>
```
**Step 4: Run Your Application**
Run your server.

```
node server.js
```
Visit http://localhost:3000 in your web browser, and you should be able to see the chat application. Open multiple browser tabs to simulate different users and see real-time chat in action.

That's it! You've created a basic real-time chat application using Socket.io and JavaScript. Feel free to enhance it by adding features like user authentication, private messaging, or a better user interface.
What is Rego and how do you use it?
Tags: kubernetes, cloudnative, security
Published: 2023-11-30 15:20:39

The Rego language, used primarily with the Open Policy Agent (OPA), is a high-level declarative language for writing policy as code. Here's a basic illustration of how to use Rego:

### Example Scenario: User Access Control

Suppose we have a system where we need to control user access based on their roles.

#### Data Model

First, define a simple data model. In a real-world scenario, this could be JSON data representing user roles and permissions:

```json
{
  "users": {
    "alice": {"role": "admin"},
    "bob": {"role": "developer"},
    "eve": {"role": "intern"}
  }
}
```

#### Policy Definition

Next, write a Rego policy to specify who can access what. For instance, we might want only admins to access sensitive data:

```
package example

default allow = false

allow {
  input.user.role == "admin"
}
```

In this policy:
- The `package` keyword defines a namespace (`example`).
- `default allow = false` sets the default decision to deny access.
- The `allow` rule permits access if the user's role is "admin".

#### Query

You'd then query this policy with input data to make access decisions. The input might look like:

```json
{
  "user": {"role": "admin"}
}
```

You'd ask OPA a question like: "Given this input, should access be allowed?" If the input user role is "admin", the policy allows access, returning `true`.

#### Use in Code

In application code, you'd typically integrate OPA as a service or library. The application sends input data (e.g., user information) to OPA and gets back a decision based on your Rego policies.

This example is simplistic but illustrates the basic use of Rego. Real-world scenarios often involve more complex policies, multiple data sources, and integration with services like Kubernetes for dynamic policy enforcement.
🤔 Python Quiz: Need a hint? I mean, type hint.
Tags: python, programming, beginners
Published: 2023-11-30 15:04:03

Follow me to learn 🐍 Python in 5-minute a day fun quizzes! Find [previous quiz here](https://dev.to/vladignatyev/python-quiz-264-pep-8-formatting-quiz-4232).

We're back with another fun and enlightening Python challenge! This time, we're delving into the world of type hints as guided by PEP 484. Are you ready to test your Python prowess?

We've got two Python functions, both aiming to do the same thing but written differently. 

Which one follows the best practices as per PEP 484?

## Sample 1
```python
def greet(name):
    return "Hello, " + name

print(greet(123))
```

## Sample 2
```python
def greet(name: str) -> str:
    return f"Hello, {name}!"

print(greet("Alice"))
```

Post your answer in the comments – is it **0** for the first sample or **1** for the second? As usually, the correct answer with explanation will be in comment.

> or [Go to the next quiz](https://dev.to/vladignatyev/python-quiz-464-snake-comprehensions-40g7)
I'm looking for contributors for my open source project
Tags: javascript, gamedev, napl, bunjs
Published: 2023-11-30 14:57:22

So I'm back at looking for contributors for my game engine: Project NAPL. Instead of writing a long article, I'd just like to share this video which pretty sums it up:

{% embed https://www.youtube.com/watch?v=5a7A-lub3cE  %}

And please check out the video description for more details.

Here's the project link: https://jacklehamster.github.io/bun-engine/
The Ultimate Guide to Electric Longboard Skateboards: Everything You Need to Know!
Published: 2023-11-30 14:53:54

Electric longboard skateboards are the latest trend in the world of skateboarding. They are a fun and eco-friendly way to commute, travel, or just have fun. If you are new to electric longboard skateboards, this guide will provide you with everything you need to know.

[![electric longboard skateboard](https://www.ecomobl.com/wp-content/uploads/2023/08/ecomobl-electric-board-17.jpg)](https://www.ecomobl.com/product/ecomobl-et-pro-2wd-12s3p-street-all-terrain-electric-longboard-delivered-within-a-week/?utm_source=dev_to&utm_medium=rankking)

## What is an Electric Longboard Skateboard?

An [electric longboard skateboard](https://www.ecomobl.com/product/ecomobl-et-pro-2wd-12s3p-street-all-terrain-electric-longboard-delivered-within-a-week/?utm_source=dev_to&utm_medium=rankking) is a skateboard that is powered by an electric motor. It is similar to a regular longboard skateboard, but it has a battery-powered motor that propels the board forward. The motor is controlled by a handheld remote, which allows the rider to control the speed and direction of the board.

## References

  * [electric longboard skateboard](https://odywood.com/changelanguage/2?returnurl=https://www.ecomobl.com/product/ecomobl-et-pro-2wd-12s3p-street-all-terrain-electric-longboard-delivered-within-a-week/ "electric longboard skateboard")



## Benefits of Electric Longboard Skateboards

There are many benefits to using an electric longboard skateboard. One
Diving into SuperViz SDK: Samples for every component
Tags: javascript, beginners, samples, resources
Published: 2023-11-30 14:50:11

Hi everyone,

I'm excited to share with you a new resource that we have created at SuperViz. Our SDK can be used in different ways and with different technologies, so we wanted to make it easier for you to get started even quicker.

That's why we have created a [GitHub repository with samples](https://github.com/superviz/samples) for each component of our SDK and for each scenario that you might encounter. Whether you are using JavaScript, TypeScript, CDN, React or Vue, we have a sample for you. 

We hope that this repository will help you explore the features and capabilities of our SDK, and to see how you can integrate it with your own projects. We also welcome your feedback and suggestions on how to improve our SDK and our samples.

But we are not stopping here. We are working to bring more libraries and frameworks, such as Svelte and Angular, to this sample repository. Stay tuned for more updates and announcements on our social media channels and [our Discord server](https://discord.gg/ZHsehfhVaD).

Happy coding!
Color Guessing Game | HTML, CSS & JavaScript Project
Tags: javascript, webdev, programming, beginners
Published: 2023-11-30 14:49:40

{% embed https://www.youtube.com/embed/rwFTkZfDJCg?si=z3RINkHkdQMVCwDW %}

Certainly! The provided text outlines the creation of a color guessing game using [HTML, CSS, and JavaScript](https://www.youtube.com/@learnwithdanial417). Let's break down the key points:


## Objective:

- The main goal is to create an interactive and engaging color guessing game where players need to select the [correct color](https://www.youtube.com/@learnwithdanial417) based on RGB values.

## Technologies Used:

- **HTML:** The markup language that structures the content of the game.
- **CSS:** Cascading Style Sheets used for styling and visual design.
- **JavaScript:** The programming language that adds interactivity and game logic to the project.

## Game Features:

### Difficulty Modes:

- The game includes different difficulty modes, such as Easy and Hard. These modes likely adjust the number of color options presented to the player, making the game suitable for various skill levels.

### Responsive Layout:

- The game is designed to be responsive, ensuring a seamless experience across different devices and [screen sizes.](https://www.youtube.com/@learnwithdanial417)

## Project Structure:

- The HTML file structures the content of the game, defining elements such as the color display, message area, buttons, and game grid.
- The CSS file styles the visual aspects of the game, including fonts, colors, and layout.
- The JavaScript file handles the game's logic, including generating random colors, picking a target color, updating the display, and checking player selections.


## Learning and Practice:

- This project is suitable for individuals learning front-end development as it combines [HTML, CSS, and JavaScript](https://www.youtube.com/@learnwithdanial417) to create an interactive web application.

## User Experience:

- Players interact with the game by selecting colors based on RGB values, receiving feedback on the correctness of their choices. The game provides an engaging and educational experience.



![HTML, CSS, and JavaScript](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/t8n4xq4sknu5ezg9t68i.jpg)

In summary, the color guessing game project involves creating a visually appealing and interactive[ web application using HTML, CSS, and JavaScript.](https://www.youtube.com/@learnwithdanial417) It includes features like difficulty modes and a responsive layout, making it a practical and engaging project for individuals looking to enhance their front-end development skills.
Golden rules to live well in ITOps
Published: 2023-11-30 14:26:08

Here I list some simple rules to live well in IT Operations, from my experience; these rules are to be taken as they are, with no warranty, and exceptions can apply.

## 1. No releases on Fridays
Friday is sacred and the weekend is spent with family, friends, or even just chilling out. Do not jeopardize your weekend with a Friday release. 

## 2. Production is sacred
Do not touch the production environment, even if the option seems compelling. Copy the environment somewhere else, safe, and play with it. You would spend the same amount of time for copying the environment, to fix possible outages in production caused by your actions. 

## 3. Make Team decisions and foster communication
Do not decide for yourself, always involve the team in your final decisions. Speak with your Team and with stakeholders, communication is at the base of early civilization and can be the game changer even nowadays.

## 4. In case of outages, focus on production
In case of outages focus on fixing the production environment, lower environments (dev, stage, etc...) can wait, but customers do not. 

## 5. Do not overdo, and do not always follow your gut
Do what you are asked to do, and do not overdo tasks; this is not to be confused with "do the minimal acceptable", but is just a foster to follow your task guardrails and not do things that can lead to issues. For me following my gut sometimes leads to issues, so I also learned how to ignore it :)
8 Best BI Tools For Small Businesses
Tags: businessintelligence, datavisualization, datanalytics, business
Published: 2023-11-30 14:42:40

Here's my article comparing the 8 best BI tools tailored specifically for small businesses. 📊

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/yftp5xrtvz6pk98z2xbx.png)

## Why are these tools great for small businesses?
1. No coding or SQL knowledge required
2. Easy setup and no IT knowledge necessary
3. User-friendly editing
4. Functionality is straight-forward
5. The pricing is friendly and doesn't require huge investments

## Let's gather the top 8 ✨
1. Ajelix BI
2. Trevor
3. Zoho
4. Datapad
5. Klipfolio
6. Looker studio
7. Datawrapper
8. Infogram

Read the full comparison: [8 Best BI Tools For Small Businesses](https://ajelix.com/bi/business-intelligence-tools-for-small-business/)

Would you add anything?
CAPTCHA vs. Passkeys: Can passkeys be a better solution?
Tags: captcha, passkey, webauthn, webdev
Published: 2023-11-30 14:31:56

Many online users hate CAPTCHAs. Originally designed as a simple test to distinguish humans from bots, they’ve evolved into complex and often frustrating challenges. This blog examines the increasing complications of CAPTCHAs and explores whether passkeys could offer a more user-friendly alternative.

## Drawbacks of CAPTCHAs
CAPTCHAs, short for “Completely Automated Public Turing Test to Tell Computers and Humans Apart,” are essential for internet security but come with significant drawbacks.
For users, they’re often time-consuming and annoying, especially challenging for visually impaired individuals. Businesses face conversion rate drops and GDPR compliance issues, while bots increasingly are able to pass these tests.

## Alternatives to CAPTCHA
The quest for effective and user-friendly bot prevention methods has led to several alternatives, each with its unique approach:

- Cloudflare’s Turnstile: Revolutionizing bot prevention, Turnstile simplifies verification to a checkbox click, conducting background checks that blend user-friendliness with robust security.
- Arkose Labs: Offering more engaging formats for human verification, Arkose Labs focuses on creative challenges that are fun yet secure, balancing user experience with bot deterrence.
- hCAPTCHA: A privacy-centric option, hCAPTCHA maintains the conventional approach of CAPTCHAs while emphasizing data privacy, a response to concerns raised by Google’s reCAPTCHA.
friendlyCAPTCHA: Prioritizing GDPR compliance and privacy, 
- friendlyCAPTCHA offers background checks for suspicious activities, aligning with European data protection standards.
Read more details about each alternative in the [original blog post](https://www.corbado.com/blog/captcha-passkeys).

## Passkeys as the new CAPTCHA?
Unlike traditional passwords or CAPTCHAs, a [passkey](https://www.corbado.com/glossary/passkey) is a unique digital representation of a user, which can assert their presence and confirm specific hardware specifications. This could promise a smoother user experience, similar to Google’s “Google One Tap” service, which allows effortless account creation or logins with just a click.

However, the current security and technical feasibility of passkeys doesn’t yet meet the theoretical opportunity at 100%. Find out the technical details and whether passkeys could replace CAPTCHA in the original blog post by Corbado:
[CAPTCHA vs. Passkeys: Everyone hates CAPTCHA](https://www.corbado.com/blog/captcha-passkeys)
md asikur -software engineer
Tags: mdasikur, mdashikur, webdeveloper, mern
Published: 2023-11-30 14:25:45

****ahahah_a_ahahahah__ahahahhah[](ahahahah
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/1n2vehic1p87rkdgf64h.jpg))
Software Engineer | Frontend Developer | Next.Js Developer | MERN Developer | Node.js Developer | Typescript Developer
Tags: softwareengineer, fullstackwebdeveloper, backenddeveloper, javascript
Published: 2023-11-30 14:23:38

Software Engineer | Full-stack Web Developer | Frontend Developer | Back-end Developer | Next.Js Developer | MERN Developer | Node.js Developer | Typescript Developer     - Md Asikur
My very first post about our new API
Tags: crm, api
Published: 2023-11-30 14:20:54

Welcome to the S!MPLE TEAM on DEV.TO!

At [**Simple CRM**](https://crm-pour-pme.fr), a passionate team that firmly believes in collaboration and knowledge exchange, we discovered DEV.TO at lunchtime ;-) And we thought joining this community would be a great plus for us.

So I'm making this first post, which is for the internal use of my colleagues.

Today, we're particularly excited to present our brand new **[Simple CRM & ERP API](https://crm-pour-pme.fr/api/doc3/)** to the DEV community. Our documentation details all the functions available in the API, enabling read-write access to various Simple CRM objects such as contacts, companies, interactions and projects.

If you're a Simple CRM user, you now have the opportunity to integrate our API into your projects. To get started, follow these simple steps:
1.	Be a Simple CRM customer.
2.	Request activation of your API by sending an email to "support at@@at crm-pour-pme.fr".
3.	Obtain the API Key corresponding to the Simple CRM user who will be making the API calls.

Remember, keep your API Key secret and only share it with people you trust. As a Simple CRM administrator, you can find out and modify each user's API Key by accessing their profile. We recommend that you use a complex key for added security.

The typical sequence of an API call with our system is as follows:
1.	Retrieval of a token from the API Key or logins (see authentication).
2.	Read/write operation via API.

We look forward to you exploring and integrating our API. Don't hesitate to ask questions and share your experiences. Let's build a great collaborative space together!

See you soon, folks.
5 Use Cases When Containerization Is Absolutely Useless for You
Tags: containers, docker, kubernetes, webdev
Published: 2023-11-30 14:19:59

## #1 Static, Unchanging Environments

If your application has minimal dependencies and operates consistently across different environments without the need for isolation, containerization may offer little benefit.

**Example:**
- If your application will be the only process executed on the machine.

## #2 Limited Scalability Needs

For applications with predictable and steady workloads that do not require rapid scaling or dynamic resource allocation, the overhead of containerization might outweigh the advantages.

**Example:**
- Small scale IoT apps.

## #3 Simple, Standalone Applications

In cases where your application is straightforward, lacks dependencies, and isn't part of a larger ecosystem with varied technologies, containerization may introduce unnecessary complexity.

**Example:**
- Zero dependency binaries, and also debugging a host process is more straightforward than doing the same with a container.
- Offline applications installed from external medium, running without internet connection.

## #4 Resource-Constrained Environments

On systems with extremely limited resources, such as embedded devices or constrained hardware, the overhead of running containerization platforms might not be justified.

**Example:**
- Microelectronics.

## #5 Desktop Applications

Sounds exotic, huh? For a good reason. It would be very unusual to use containers for desktop applications. Though similar isolation techniques exist, it is not widespread.

**Example:**
- cs_16_nosteam_portable.exe😅

## If You Really Need to Containerize...

You can use dyrector.io to deploy and manage containerized services.

**⭐ Star dyrector.io on GitHub:**

- https://github.com/dyrector-io/dyrectorio