teleren/devto huggingface dataset:
Re-entrancy attacks in Ethereum smart contrats
Tags: ethereum, solidity, programming, blockchain
Published: 2022-12-17 14:30:45

A re-entrancy attack is a type of vulnerability that can occur in smart contracts that allow an attacker to repeatedly call an external contract in a way that consumes all available gas. This can lead to a denial of service (DoS) attack or allow the attacker to exploit the contract for their own benefit.

Here is an example of a simple contract written in Solidity that is vulnerable to a re-entrancy attack:


```
pragma solidity ^0.6.0;

contract ReentrancyAttack {
    // The attacker's contract address
    address public attacker;

    // The contract's balance
    uint public balance;

    // Constructor to set the attacker's contract address
    constructor(address _attacker) public {
        attacker = _attacker;
    }

    // Fallback function that is called when the contract receives ether
    function() external payable {
        // Update the contract's balance
        balance += msg.value;

        // Call the attacker's contract
        attacker.call.value(msg.value)();
    }
}

```
In this example, the contract has a fallback function that is called whenever the contract receives ether. The function updates the contract's balance and then calls the attacker's contract. If the attacker's contract calls back into the original contract, it can create an infinite loop that consumes all available gas.

To prevent this type of attack, it is important to carefully consider the potential for re-entrancy when designing and implementing smart contracts. One way to do this is to use a mutex or lock to prevent multiple calls to the contract's functions at the same time.

Here is an example of how to use a mutex to prevent a re-entrancy attack in Solidity:

```
pragma solidity ^0.6.0;

contract ReentrancyAttack {
    // The attacker's contract address
    address public attacker;

    // The contract's balance
    uint public balance;

    // A flag to indicate if the contract is currently executing
    bool public executing;

    // Constructor to set the attacker's contract address
    constructor(address _attacker) public {
        attacker = _attacker;
    }

    // Fallback function that is called when the contract receives ether
    function() external payable {
        // Set the executing flag to true
        executing = true;

        // Update the contract's balance
        balance += msg.value;

        // Call the attacker's contract
        attacker.call.value(msg.value)();

        // Set the executing flag to false
        executing = false;
    }
}
```

In this example, the contract sets a flag (executing) to true before calling the attacker's contract and sets it to false after the call is complete. This allows the contract to prevent re-entrancy by checking the executing flag before executing any functions.

It is important to note that this is just one way to prevent re-entrancy attacks, and there may be other methods that are more suitable for different types of contracts. It is always best to carefully consider the potential vulnerabilities of your contract and take steps to mitigate them.
Introducing ChatGPT: The Revolutionary Chatbot Powered by OpenAI's GPT-3
Tags: ai, openai
Published: 2022-12-17 14:14:43

,
**Hey fellow developers!**

A Revolutionary chatbot powered by OpenAI's GPT-3 language model. ChatGPT is capable of understanding and generating human-like responses to any conversation, making it an ideal tool for customer service, virtual assistants, and more.

One of the key features of ChatGPT is its ability to learn and adapt over time. As it interacts with more users, it becomes smarter and more accurate, making it a valuable asset for businesses looking to improve their customer experience.

In addition, ChatGPT is extremely easy to integrate into any application or website. Simply send a message to the API and receive a response within seconds. You can even customize the responses and tone of the chatbot to fit your brand's voice and personality.

We can't wait to see all the creative and innovative ways developers will use ChatGPT to enhance their products and services. Try it out for yourself and see the power of GPT-3 in action!

Excited to hear your thoughts and see what you build with ChatGPT.


FYI : this is article generated by ChatGPT 


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/cdc9m0xt9p6rex1k30wm.jpg)
Top-10 Study for Machine Learning
Published: 2022-12-17 14:08:53

Here are the top 10 studies for machine learning that I would recommend:

1. **Machine Learning by Andrew Ng**: This is an excellent introduction to machine learning, covering the fundamental concepts and techniques of the field.

2. **Deep Learning by Ian Goodfellow, Yoshua Bengio, and Aaron Courville**: This book provides a comprehensive overview of deep learning, including both the theory and practice of this powerful machine learning technique.

3. **Python Machine Learning by Sebastian Raschka**: This book is a great resource for learning about machine learning using Python, one of the most popular programming languages for machine learning.

4. **Hands-On Machine Learning with Scikit-Learn and TensorFlow by Aurélien Géron**: This book provides a hands-on approach to machine learning, with practical examples and exercises to help you get up and running with machine learning quickly.

5. **The Elements of Statistical Learning by Trevor Hastie, Robert Tibshirani, and Jerome Friedman**: This book is a classic in the field of machine learning, covering the statistical foundations of machine learning and the most important algorithms.

6. **Introduction to Artificial Intelligence by Russell and Norvig**: This book is a comprehensive introduction to artificial intelligence, covering the fundamental concepts and techniques of the field.

7. **Pattern Classification by Duda and Hart**: This book is a classic in the field of pattern classification, covering the fundamental concepts and techniques of supervised learning.

8. **Neural Networks for Pattern Recognition by Christopher Bishop**: This book is a comprehensive introduction to neural networks, covering both the theory and practice of this important machine learning technique.

9. **Machine Learning: A Probabilistic Perspective by Kevin Murphy**: This book is a comprehensive introduction to machine learning, covering the fundamental concepts and techniques of the field from a probabilistic perspective.

10. **An Introduction to Machine Learning by Alpaydin**: This book is a concise introduction to machine learning, covering the fundamental concepts and techniques of the field in an easy-to-understand manner.
Linux vs Ubuntu : Beyond an OS!
Tags: linux, ubuntu, tutorial, beginners
Published: 2022-12-17 13:47:59

Linux and Ubuntu are closely related, but they are not the same thing. Here are some key differences between the two:

1. Kernel vs. operating system: As mentioned earlier, Linux is a kernel, which is the core of an operating system. It is responsible for managing the hardware resources of a computer and allowing other software to run on it. Ubuntu, on the other hand, is a complete operating system that includes the Linux kernel, as well as a wide range of other software such as a desktop environment, system utilities, and applications.

2. Open source vs. commercial: Linux is an open-source software project, which means that the source code is freely available for anyone to use, modify, and distribute. Ubuntu, on the other hand, is developed and maintained by Canonical, a commercial company. While Ubuntu is also based on open-source software, Canonical provides paid support and services for businesses and organizations using Ubuntu.

3. Community-driven vs. commercially supported: Because Linux is an open-source project, it is developed and maintained by a large community of volunteers around the world. Ubuntu, on the other hand, is developed and maintained by Canonical, which provides commercial support and services for businesses and organizations using Ubuntu.

4. Customization: Because Linux is an open-source kernel, it can be customized and adapted to a wide range of uses and environments. There are many different distributions of Linux available, each with its own unique features and target user base. Ubuntu is one such distribution, but it is generally geared towards personal computers and servers, and it is known for its ease of use and large community of users and developers.

**TL;DR ** _Overall, Linux and Ubuntu are closely related and have many similarities, but they are not the same thing. Linux is a kernel that is the core of an operating system, while Ubuntu is a complete operating system that is based on the Linux kernel. Linux is an open-source project developed and maintained by a community of volunteers, while Ubuntu is developed and maintained by a commercial company._
5 Steps to Becoming High Performance Engineer
Published: 2022-12-17 13:45:25

1. **Focus on continuous learning**: High performance engineering is a field that is constantly evolving, so it's important to keep your skills and knowledge up-to-date. Make a commitment to continuous learning by taking courses, attending conferences, and staying up-to-date on industry news and trends.

2. **Build strong problem-solving skills**: High performance engineers need to be able to identify and solve complex problems quickly and effectively. Practice your problem-solving skills by working on challenging projects and seeking out opportunities to tackle real-world problems.

3. **Develop your technical expertise**: High performance engineering requires a deep understanding of a wide range of technical subjects, including computer science, mathematics, and engineering. Take the time to learn as much as you can about these subjects and continue to deepen your understanding over time.

4. **Work on your communication skills**: As a high performance engineer, you'll need to be able to communicate complex technical ideas to a wide range of audiences, from your colleagues to your customers. Practice your communication skills by giving presentations, writing technical documents, and collaborating with others on projects.

5. **Build a strong professional network**: Networking is an important part of any career, and it's especially important in high performance engineering. Attend industry events, join professional organizations, and make connections with other professionals in the field. These connections can help you learn about new opportunities, get advice and guidance, and stay up-to-date on industry developments.

Overall, being a high performance engineer can be a fulfilling and rewarding career choice for those who are passionate about technology and problem-solving.
ToDo-Compose
Tags: android, mobile, tutorial, programming
Published: 2022-12-17 13:08:32

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/12yp0myb6t32yuyah8ei.gif)

A project contains Jetpack Compose, Single Activity, Compose Navigation Component, Dependency Injection with Hilt, Jetpack Compose Animations, MVVM + Clean Architecture, Kotlin, Coroutines, Room, etc... .
You can check the code here:
[Github Repo: https://github.com/AlirezaGoshayesh/ToDo-Compose](https://github.com/AlirezaGoshayesh/ToDo-Compose)
How to classify images using Tensorflow , Mobilenet and Python ?
Published: 2022-12-17 13:03:34

Hi,

This is a Tensorflow tutorial that enables you to classify images using a transfer learning process.
In this tutorial, We will install the relevant Python libraries , and use  Mobilenet model , and learn how to classify and detect objects in images.

Moreover, I recommend This graphics card: NVIDIA GeForce RTX 3060 Ti . I am using it to train my Tensorflow models.
Perfect results and performance: (https://amzn.to/3mTa7HX)

The link for the video tutorial is here : (https://bit.ly/3owAuUX)
I also shared the Python code in the video description.

Enjoy

Eran

#Python #Cnn #TensorFlow
What is the CSS text-decoration Property?
Tags: css, webdev, beginners, tutorial
Published: 2022-12-17 13:00:00

**What is the CSS text-decoration Property?**

## Introduction

In short, the **text-decoration** property adds an underline, overline, line-through, or a combination of lines to selected text.

The text-decoration property specifies how the text will be decorated. It is a shorthand for text-decoration-line, text-decoration-color, text-decoration-style, and the more recent text-decoration-thickness property.

## Syntax

```css
h2 {
  text-decoration: underline;
}
```
## Values

Commonly used values are:
**none** – The default value, this defines a normal text. No line is drawn, and any existing decoration is removed.
**inherit** – Inherits this property from its parent element
**overline** – Draws a 1px horizontal line above the text
**underline** – Draws a 1px horizontal line below the text
**line-through** – draws a horizontal line through the text
**blink** – As you may guess by the name, this makes the text blink. The blink value is in the W3C spec, but it is deprecated and will not work in any current browser.

## Demo

The example below demonstrates the difference between each value.

```html
<p class="none">This is default style of the text (none).</p>
<p class="inherit">This text inherits the decoration of the parent.</p>
<p class="overline">This is overlined text.</p>
<p class="underline">This is underlined text.</p>
<p class="line-through">This is lined-through text.</p>
<p class="blink">
  This text might blink for you, depending on the browser you use.
</p>
```

```css
p.none {
text-decoration: none;
}
p.inherit {
text-decoration: inherit;
}
p.overline {
text-decoration: overline;
}
p.underline {
text-decoration: underline;
}
p.line-through {
text-decoration: line-through;
}
```

You can combine the **underline**, **overline**, or **line-through** values in a space-separated list to add multiple decoration lines.

```css
p {
  text-decoration: overline underline line-through;
}
```

## Conclusion

In this article we learnt that the text-decoration property **specifies the decoration added to text**, and is a shorthand property for: text-decoration-line (required) text-decoration-color. text-decoration-style. text-decoration-thickness.

### Further reading

Want to learn a bit more about text-decoration and its browser compatibility? Then check out – [text-decoration | MDN](https://developer.mozilla.org/en-US/docs/Web/CSS/text-decoration#:~:text=The%20text%2Ddecoration%20shorthand%20CSS,text%2Ddecoration%2Dthickness%20property.)

### See also

[How do you use Cascading Style Sheets (CSS)?](https://maxlockwood.dev/cascading-style-sheets-css-are-used-in-what-ways/)
[What are CSS Rules and Selectors?](https://maxlockwood.dev/what-are-css-rules-and-selectors/)

If you liked this article, then please share. You can also find me on [Twitter](https://twitter.com/maxlockwood88) for more updates.
Java Factory Pattern with example Explained
Tags: java, beginners, tutorial, programming
Published: 2022-12-17 12:53:02

### Introduction
The factory pattern is a creational design pattern in Java that provides an interface for creating objects in a super class, but allows subclasses to alter the type of objects that will be created.

One of the main benefits of using the factory pattern is that it allows for the creation of objects without the client specifying the exact class of object that will be created. This is useful when the client does not need to know the implementation details of the objects being created, or when there is the possibility of adding new types of objects in the future.

To implement the factory pattern in Java, you need to create a factory interface and concrete classes that implement the interface. The factory interface should have a method for creating objects, which will be implemented by the concrete classes.

##Example

For example, consider a simple application that allows users to create and customize their own cars. The application has three types of cars: sedan, hatchback, and SUV. We can implement the factory pattern by creating a CarFactory interface with a createCar() method, and concrete classes SedanFactory, HatchbackFactory, and SUVFactory that implement the CarFactory interface and create specific types of cars.

```
public interface CarFactory {
    public Car createCar();
}

public class SedanFactory implements CarFactory {
    public Car createCar() {
        return new Sedan();
    }
}

public class HatchbackFactory implements CarFactory {
    public Car createCar() {
        return new Hatchback();
    }
}

public class SUVFactory implements CarFactory {
    public Car createCar() {
        return new SUV();
    }
}
```
To use the factory pattern, the client can simply create an instance of the appropriate factory and call the createCar() method to create a new car. For example:

```
CarFactory factory = new SedanFactory();
Car car = factory.createCar();
```

This allows the client to create a sedan without having to specify the exact class of the object that will be created. If the application needs to support additional types of cars in the future, all that is required is to create a new factory class that implements the CarFactory interface.

##Conclusion

The factory pattern is a useful way to create objects in a flexible and extensible manner, and is particularly useful when the exact type of object to be created is not known at compile-time. It can also help to reduce the coupling between the client and the implementation classes of the objects being created.
What is Cypress Cloud ? | How to Run Test Case Parallelly in Cypress Cloud and CI/CD GitHub actions?
Tags: cypress, testing, qa, github
Published: 2022-12-17 12:42:56

Hello My Friend!!
In today’s world where time equals money, it is very important to lower the execution time for various actions. When doing testing, the same holds true. One of the most popular methods for running more test cases in less time is to execute tests concurrently.

In this blog we are going to cover:

1. How we can set up /Integration with Cypress Cloud
2. Parallel Cypress Test case execution In CI/CD GitHub Action
3. In the last, you will see compression in time taken when we execute test cases in Cypress Cloud with a different set of Machine

**Here is the link
https://qaautomationlabs.com/test-case-parallelly-in-cypress-cloud-and-ci-cd-github-actions/**
Portfolio App By React Bricks
Tags: react, webdev, portfolio, portfoliowebsite
Published: 2022-12-17 12:34:15

Hello Guys in this Blog I have to tell you about my project I have built a **Portfolio App** Built with `React Bricks & TypeScript` in **Replit** which is easy ❣ and Anyone can use to make apps in just a few minutes ⌛ you just know How to Code Simply Create a Blog or Portfolio App in Minutes ⌚

### Check it out 👉 [LIVE DEMO](https://hamza-zaidi-portfolio-shjz.vercel.app/) 🚀🐱‍🏍 or See the [Code](https://github.com/HamzaZaidiX/Portfolio-App-By-React-Bricks)

## React Bricks:

The [**React Bricks**](https://reactbricks.com/) is for developers to make apps create visually editable blocks as React components for `Next JS, Gatsby, Remix` is just not more than 5 mins and Create, Customize and Edit your app and **Deploy your App** in just a few mins. All the advantages of a **Headless CMS**, but your users will love it.

![ss](https://camo.githubusercontent.com/7fb3087818b939f3c7d7e81128a4486d93c17d432f414e72f0d211990e51d7c8/68747470733a2f2f647432736466306462387a6f622e636c6f756466726f6e742e6e65742f77702d636f6e74656e742f75706c6f6164732f323032322f30362f436f6e74656e742d65646974696e672d6f7074696d616765312e706e67)

## 🚀 Quick start

We suggest that you use the **CLI** and choose this starter. In this way, you will have the credentials already set up in a `.env.local file`:

```
npx create-reactbricks-app
npm run dev
or
yarn create-reactbricks-app
yarn dev
```
Otherwise, you can directly Clone my GitHub repo:

```
git clone https://github.com/HamzaZaidiX/Portfolio-App-By-React-Bricks
```

also extract the subdirectory portfolio app or you can Fork and Run it on Replit

## 📖 Documentation:

Please, read our Documentation at React Bricks.

Also Please Read How to Deploy your Project on [Vercel](www.vercel.com)

## Bye! 👋

HOPE U LIKE THIS PROJECT PLEASE! IF YOU ARE USING THIS CODE PLEASE GIVE [**HAMZA ZAIDI**](https://github.com/HamzaZaidiX) SOME CREDITS BY LIKING & GIVE A HEART!!! 😃👍💛
Simple Search box with icon
Tags: webdev, html, css
Published: 2022-12-17 12:28:08

It's like this:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/eyknz8xfm7e5d5qcag7t.png)

Here is the code:

```html

<input class="search" type="search" placeholder="Search...">

```

```css
    input.search {
        width: 260px;
        border: 1px solid #555;
        display: block;
        padding: 9px 4px 9px 40px;
        background: transparent url("/assets/search.svg") no-repeat 13px;
    }
```

`padding` top, left, bottom, right - Places `placeholder` named `Search` just beside icon inside input. 

download `svg` from any icon store say [bootstrap] (https://icons.getbootstrap.com/icons/search/) and place inside folder. 

`background` property - color, image, repeat, position - Places search icon in proper place in search box.

Thanks.

U can follow me here: [urstrulyvishwak](https://twitter.com/urstrulyvishwak)
ChatGPT "The New Magic Response System"
Published: 2022-12-17 12:18:26



**Introduction**
The ChatGPTt is the most intelligent and impressive artificial intelligent chatbot created by Open AI. It was released on November 20, 2022. ChatGPT is a natural language processing  that can answer questions, follow up on the question, admit flaws, challenge incorrect premises, and reject inappropriate requests.

**What are the uses of the ChatGPT**

1. Answering user questions.
2. Writing text compositions.
3. Solving math equations
4. Writing text
5. Debugging and fixing code
6. Translating between lanaguage creating text summaries recommendaton
7. Classifying things

**How does it work**
ChatGPT has been trained using a large database of information obtained from the internet. According to Open AI, ChatGPT employs the use of  Reinforcement Learning from Human Feedback (RLHF). It has an easy-to-use interface that allows it to respond to follow-up questions, reject certain requests, and detect when it has malfunctioned. It is also relatively simple to use.

**How to use ChatGPT**
Go to https://chat.openai.com on your computer or phone, login to your account or create a new account

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/q0s3m8vduhxe5b18044y.png)

**ChatGPT In Action**

- Asking ChatGPT to explain version control system

---

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/e3dcr0wlbb7q6wt31mk6.png)

- Asking ChatGPT to solve leetcode question



 
Given an input string s and a pattern p, implement regular expression matching with support for '.' and '*' where:

'.' Matches any single character.​​​​
'*' Matches zero or more of the preceding element.
The matching should cover the entire input string (not partial).

---

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/i08ccu2th1m5lf4vf89x.png)

**ChatGPT VS Search engine**
ChatGPT is a conservational base model that uses information from training data and general responses while Search engines help to get information by indexing web pages on the internet.

**Limitation of ChatGPT**
The inability to provide contextual answers that are required in a specific way. The quality of the response is the main issue with chatGPT. According the openAi some of the limitations of ChatGPT are:

- May occasionally generate incorrect information
- May occasionally produce harmful instructions or biased content
- Limited knowledge of the world and events after 2021