teleren/devto huggingface dataset:
Fun with Array.prototype.fill()
Tags: javascript
Published: 2024-06-25 18:49:19

Recently, I came across the following code snippet:
```js
const arr = new Array(2).fill([])
arr[0].push(1)
arr[0] === arr[1] // true or false?
```
The correct answer is **true**. 
Both elements at indexes 0 and 1 contain the same mutable value - empty array which was passed as an argument the the method. 
See the description from the [ECMAScript specification](https://tc39.es/ecma262/#sec-array.prototype.fill):

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/8rljs1hgcfusjwsvm31z.png)

Array.prototype.fill() expects in its first parameter an already defined value and then just set the same value as "number"-keyed property values (step 11b).

This definitely sounds like a challenge for JS geeks. Is it possible to use Array.prototype.fill() in such a way that each element in the resulting array has its own empty array?
Something like that:
```js
const arr = new Array(2).fill([])
arr[0].push(1)
arr[0] === arr[1] // false
arr[0].length //1
arr[1].length //0
```
To achieve this, I’d use the insight provided by step 11b from the specification:

> b. Perform ? Set(O, Pk, value, true).

That statement is straightforward: it sets the value (value) of a specific property key (Pk) of an object (O). JavaScript has a feature that can intercept and redefine fundamental operations for that object. It's called a Proxy!

Let's use a Proxy object and redefine an array set operation to solve our challenge:
```js
const handler = {
    set(obj, prop, value) {
    //assign a new "instance" of empty array to the properties
    obj[prop] = [...value]    
    return true
  },
}
// Proxy cracks the challenge!
const arr = [...new Proxy(Array(2), handler).fill([])];
arr[0].push(1)
arr[0] === arr[1] // false
arr[0].length //1
arr[1].length //0
```

Solved!
BitPower’s Security: Guarantee of Decentralized Smart Contracts
Published: 2024-06-28 15:00:58

As a leading cryptocurrency trading platform, BitPower focuses on security and provides a high degree of security through blockchain technology and smart contracts. On BitPower, the decentralized nature of smart contracts is particularly prominent, providing security for users' transactions and assets.

Security of blockchain
Blockchain technology uses distributed ledgers and encryption technology to ensure that every transaction is verified and recorded on multiple nodes. This decentralized architecture eliminates single points of failure and attack risks, and protects the security and privacy of user assets.

The role of smart contracts
Smart contracts are automated protocols executed on the blockchain, and their code and execution process are open and transparent. On BitPower, smart contracts can automatically execute transactions and contract terms without intermediaries, reducing the possibility of fraud and errors.

Security advantages of decentralization
No need to trust third parties: The decentralized nature of smart contracts means that the execution of transactions and contracts does not rely on a single intermediary, eliminating trust issues and intermediary risks.

Immutability of data: The results of all transactions and contract executions are recorded on an immutable blockchain, ensuring the integrity and credibility of the data.

High transparency: The code and execution process of smart contracts are visible to all participants and can be reviewed and verified by anyone, which enhances the transparency and trust of the system.

On BitPower, users can take advantage of these security features to trade cryptocurrencies and use smart contracts with confidence, ensuring the security and reliability of their assets and transactions.
İstanbul Koltuk Tamircisi
Tags: seo, wordpress, website
Published: 2024-06-28 14:54:45

[İstanbul Koltuk Tamircisi](https://istanbulkoltuktamircisi.com/), 2010 yılından bu yana sektörde hizmet veren, deneyimli ve uzman kadrosuyla [koltuk tamir](https://istanbulkoltuktamircisi.com/koltuk-tamiri) ve [koltuk döşeme](https://istanbulkoltuktamircisi.com/koltuk-doseme) alanında öncü bir atölyedir. Her türlü koltuğun tamir ve döşeme işlemlerini titizlikle gerçekleştiriyor, İstanbul genelinde siz değerli müşterilerimize kaliteli ve güvenilir hizmet sunuyoruz.

İstanbul koltuk tamir servisi olarak ofis, iş yeri ve evlerinizde kullandığınız her türlü koltuk ve sandalyeyi tamir ediyoruz.
Kırılan, bozulan parçaları tamir ediyor yada yedek parça olarak değiştiriyoruz.
Üstelik bir çok yedek parça değişim işlerini direk adresinizde 5 dakikada hallediyoruz.
Yaptığımız tüm onarım işlerine, değiştirdiğimiz tüm parçalara “garanti” veriyoruz.
Sizde koltuklarınızın tamirini İstanbul koltuk tamircisi ekiplerimize teslim edin, rahat edin.
Hemen whatsapp hattımıza 0544 388 82 28 tamir edilecek koltuğun fotoğraflarını gönderin, anında fiyat alın.
Servis ekibimizle randevu oluşturun ve hızlı ve garantili tamir işleminin keyfini sürün.
Koltuk döşeme işleri için İstanbul koltuk döşeme sayfamızı ziyaret edebilirsiniz.
Hizmet verdiğimiz koltuk türleri :

Ofis koltukları ve sandalyesi tamiri.
Oyuncu koltukları tamiri.
Kuaför ve berber koltukları tamiri.
Konferans koltukları ve sandalyesi tamiri.
Kafeterya koltukları ve sandalyeleri tamiri.
Evlerde kullandığınız koltuklar, kanepeler, berjerler ve sandalyelerin tamiri.
İnternet kafe koltukları tamiri.
Hastane, okul, otel ve fabrika koltukları, sandalyeleri tamiri.
Cassiopeia is in Beta now
Tags: pdf, saas, microservices
Published: 2024-06-28 14:53:06

Hi folks,

I just wanted to share my micro SaaS with you, which I just launched into beta phase: [Cassiopeia](https://www.cassiopeia-api.cloud)

Cassiopeia is a microservice that provides an API that helps you to streamline the creation of PDF documents for your application, offering features like merging and variable data embedding. It's the simple and reliable all-in-one solution for generating invoices, offers, reports, serial letters and so on.

It provides a RESTful API for generating PDFs based on several input formats. It is designed to be used as a microservice in a larger system, and is built to be highly scalable and fault-tolerant.

**Features**

- PDF Generation: Generate PDFs from ODT, DOCX, HTML, Markdown, or plain text.
- Merging: Merge multiple documents into a single document.
- Variables / Templates: Use variables in your documents to generate dynamic content.
- Fast and Reliable: Built to be highly scalable and fault-tolerant.
- Simple API: Easy to use and integrate into your system.
- Cheap: Starting with 0€ per month.

I'd really appreciate any feedback and would love to see more users :)
WhatsApp Introduces META AI: Your New AI-Powered Chat Companion
Tags: career, programming, python, webdev
Published: 2024-06-28 14:51:16

In an exciting new update, WhatsApp has introduced 

> META AI
a powerful AI assistant designed to enhance your messaging experience. META AI is available to chat about any subject, providing instant answers, helping with daily tasks, and offering personalized assistance right within your WhatsApp conversations. This feature leverages the latest advancements in **artificial intelligence** to bring smart, context-aware interactions to your fingertips. Whether you need help with homework, want to stay updated with the latest news, or simply have a casual chat, META AI is here to assist you. Explore the future of messaging with WhatsApp's META AI!


Here you can see the magic result from Meta AI for my question "can you make a signup form with validation ?"

result from META : 

```
import React, { useState } from 'react';

function SignUpForm() {
  const [name, setName] = useState('');
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [errors, setErrors] = useState({});

  const handleSubmit = (event) => {
    event.preventDefault();
    const errorHandler = {};
    if (name.length < 3) {
      errorHandler.name = 'Name must be at least 3 characters';
    }
    if (!email.includes('@')) {
      errorHandler.email = 'Invalid email address';
    }
    if (password.length < 8) {
      errorHandler.password = 'Password must be at least 8 characters';
    }
    if (password !== confirmPassword) {
      errorHandler.confirmPassword = 'Passwords do not match';
    }
    setErrors(errorHandler);
    if (Object.keys(errorHandler).length === 0) {
      // Form submission logic here
      console.log('Form submitted successfully!');
    }
  };

  return (
    <form onSubmit={handleSubmit}>
      <label>Name:</label>
      <input 
        type="text" 
        value={name} 
        onChange={(e) => setName(e.target.value)} 
      />
      {errors.name && <p style={{ color: 'red' }}>{errors.name}</p>}
      
      <label>Email:</label>
      <input 
        type="email" 
        value={email} 
        onChange={(e) => setEmail(e.target.value)} 
      />
      {errors.email && <p style={{ color: 'red' }}>{errors.email}</p>}
      
      <label>Password:</label>
      <input 
        type="password" 
        value={password} 
        onChange={(e) => setPassword(e.target.value)} 
      />
      {errors.password && <p style={{ color: 'red' }}>{errors.password}</p>}
      
      <label>Confirm Password:</label>
      <input 
        type="password" 
        value={confirmPassword} 
        onChange={(e) => setConfirmPassword(e.target.value)} 
      />
      {errors.confirmPassword && <p style={{ color: 'red' }}>{errors.confirmPassword}</p>}
      
      <button type="submit">Sign Up</button>
    </form>
  );
}

export default SignUpForm;

```

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5mmv2hq3h8ka6vn4w61x.png)
🌟 Explore the extraordinary of BitPower Loop! 🌟
Published: 2024-06-28 14:49:33

1️⃣ Smart contract guarantee: All transactions are automatically executed by smart contracts to ensure security and transparency.

2️⃣ Decentralized lending: No third-party intermediary is required, reducing costs and increasing autonomy. Users can borrow and lend directly through smart contracts.

3️⃣ Funding pool mechanism: Suppliers deposit assets into the fund pool, borrowers provide collateral and borrow the required assets from it, with higher liquidity.

4️⃣ Dynamic interest rate: The interest rate is adjusted in real time according to market supply and demand, transparent and open to ensure fairness.

5️⃣ Global service: Based on blockchain technology, users around the world can participate without geographical restrictions.

6️⃣ Fast approval: Smart contracts automatically review loan applications without manual intervention, efficient and convenient.

7️⃣ Secure asset collateral: Borrowers provide encrypted assets as collateral to reduce loan risks, provide higher loan amounts and lower interest rates.

🔗 Join BitPower Loop and experience safe, efficient and convenient decentralized lending services! #DeFi #Blockchain #Smart Contract #Decentralized Lending #BitPowerLoop

🔍 Learn more: https://bitpowerloop.com
how to flash bitcoin
Tags: flashbtc, flashusdt, flashbitcoinsoftware, flashbitcoin
Published: 2024-06-28 14:45:39

FlashGen (BTC Generator), the innovative software that allows you to generate Bitcoin transactions directly on the Bitcoin network. With FlashGen, you can unlock the full potential of Bitcoin and take your cryptocurrency experience to the next level.

What is FlashGen (BTC Generator)?

FlashGen (BTC Generator) is not just another Bitcoin fork; it’s a game-changer. This cutting-edge software enables you to generate fully confirmed Bitcoin transactions that can remain on the network for an impressive duration of up to 60 days with the basic license and a whopping 120 days with the premium license.


How to Flash Bitcoin with FlashGen

With FlashGen, you can generate and send up to 0.05 Bitcoin daily with the basic license, and a staggering 0.5 Bitcoin in a single transaction with the premium license. Here’s how to get started:

Choose Your License: Select from our basic or premium license options, depending on your needs.
Download FlashGen: Get instant access to our innovative software.
Generate Bitcoin Transactions: Use FlashGen to generate fully confirmed Bitcoin transactions.
Send Bitcoin: Send Bitcoin to any wallet on the blockchain network.
contact martelgold on telegram today! t.me/martelgold

FlashGen Features

Our FlashGen software comes with a range of features, including:

One-time payment with no hidden charges
Ability to send Bitcoin to any wallet on the blockchain network
Comes with Blockchain and Binance server files
24/7 support
VPN and TOR options included with proxy
Can check the blockchain address before transaction
Maximum 0.05 BTC for Basic package & 0.5 BTC for Premium package
Bitcoin is Spendable & Transferable
Transaction can get full confirmation
Support all wallet
Segwit and legacy address
Can track the live transaction on bitcoin network explorer using TX ID/ Block/ Hash/ BTC address

Get Started with MartelGold’s FlashGen Products

Ready to unlock the power of FlashGen? Check out our range of products, designed to meet your needs:

Flashgen Bitcoin Software 7 Days Trial: Try before you buy with our 7-day trial offer. Learn More
Flashgen Basic: Unlock the power of FlashGen with our basic license, allowing you to generate up to 0.05 Bitcoin daily. Learn More
FlashGen Premium: Take your FlashGen experience to the next level with our premium license, enabling you to send up to 0.5 Bitcoin in a single transaction. Learn More
$1500 Flash Bitcoin for $150: Get instant access to $1500 worth of Flash Bitcoin for just $150. Learn More
$1500 Flash USDT for $150: Experience the power of Flash USDT with our limited-time offer. Learn More
Stay Connected with MartelGold

contact martelgold on telegram today! t.me/martelgold

At MartelGold, we’re dedicated to providing you with the best FlashGen solutions on the market. With our innovative software and exceptional customer support, you can trust us to help you unlock the full potential of FlashGen.
BitPower: A revolutionary force that reshapes finance
Published: 2024-06-28 14:42:24

BitPower: A revolutionary force that reshapes finance
In an infinite digital world, BitPower shines like a star. It is not just a platform, but also a revolutionary force that re-empowers the public with financial power. BitPower's advantages are like a sharp sword that breaks the shackles of traditional finance, allowing everyone to find their own path to wealth in this vast territory.

First of all, BitPower's decentralized nature is amazing. On this platform, there are no bosses, no managers, and even no individuals who can modify the rules. Once deployed, BitPower's smart contracts are as indestructible as rocks. All rules and transactions are open and transparent, and no one can tamper with them. This design ensures the security of users' funds and the fairness of transactions.

Secondly, BitPower's global service capabilities are amazing. No matter where you are, as long as you have an Internet connection, you can participate. All transactions on the platform are conducted peer-to-peer, without middlemen and without high fees. This global barrier-free service makes financial services truly borderless and barrier-free.

Furthermore, BitPower's high-yield return mechanism is fascinating. Whether it is recurring income or referral rewards, users can find a satisfactory way of income on this platform. Each recurring order will be automatically returned to the user's wallet after expiration, so that the funds are always under the control of the user. Such an income mechanism not only allows users to obtain considerable returns, but also improves the liquidity and efficiency of funds.

In addition, BitPower's smart contract technology is also a highlight. All operations such as lending, deposits, and interest calculations are automatically executed by smart contracts. This not only improves the efficiency of transactions, but also reduces the risks and errors of human operations. Every transaction data is recorded on the blockchain, which is open, transparent, and cannot be tampered with.

Finally, BitPower's community and partner system enable every participant to find their own value and belonging. By joining the BitPower community, everyone can contribute their wisdom and strength to jointly promote the development of the platform. BitPower's referral reward mechanism encourages users to invite more partners to join and share the dividends brought by this financial revolution.

In short, BitPower is redefining the future of finance with its unique advantages of decentralization, globalization, high returns, intelligence, and community. On this platform, everyone is their own master, and every transaction is an opportunity. Join BitPower, let us witness this financial revolution together and create unlimited possibilities for ourselves.

Simple, transparent, and free - this is BitPower's promise to you.
Let’s solve the error of GROUP BY clause and contains nonaggregated column in MySQL
Published: 2024-06-28 14:38:03


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/qbp2sei1njr1levl64md.png)




```


SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));


```
BitPower: A cutting-edge platform that revolutionizes decentralized lending
Published: 2024-06-28 14:36:43


![Uploading image](...)
Introduction
With the rapid development of blockchain technology, decentralized finance (DeFi) has become an important trend in financial technology. As a leading platform in this field, BitPower provides global users with safe, efficient and convenient decentralized lending services through its innovative lending protocols and smart contract technology.

About BitPower
BitPower is a decentralized lending platform based on blockchain technology that uses smart contracts to achieve asset lending without intermediaries. Its core is to create a highly liquid, transparent and secure lending market through the BitPower Lending protocol and the BitPower Loop smart contract.

Core features
Smart contract guarantee: All transactions are automatically executed by smart contracts to ensure security and transparency.

Decentralized lending: No third-party institutions are required to intervene, achieving true decentralized lending and reducing transaction costs.

Secure asset collateral: Borrowers can use crypto assets as collateral to reduce loan risks and enjoy more borrowing amounts and lower interest rates.

Transparent interest rate calculation: The interest rate is dynamically adjusted according to market supply and demand, and all interest calculation processes are open and transparent to ensure the fairness and reliability of transactions.

Fast approval process: loan applications are automatically reviewed by smart contracts, which improves loan efficiency and convenience.

Global services: Based on blockchain technology, lending services can be provided worldwide.

Main advantages
High liquidity: BitPower Loop smart contracts bring together all user assets to form a highly liquid fund pool.

Low cost and high efficiency: remove intermediaries, reduce transaction costs, and automatically execute smart contracts to improve transaction efficiency.

Safe and reliable: smart contract code is open source, all transactions are automatically executed by smart contracts, and user data is safe.

Conclusion
BitPower has created a safe, efficient and transparent lending platform through its innovative decentralized lending protocol and smart contract technology. Join BitPower and experience the infinite possibilities of decentralized finance!
Creating Custom Outdoor Structures with Pergola Kits
Published: 2024-06-28 11:13:50

Enhance your outdoor living space with our premium DIY pergola kits. Whether you're looking to add shade to your patio, create a cozy garden retreat, or build a stylish carport, our pergola kits are designed for versatility and ease of assembly. Discover how you can transform your outdoor area with our innovative products.

Versatile Applications of Pergola Kits

Shade Structures and Beyond

Our pergola kits are ideal for creating shade structures that blend seamlessly into your landscape. From pergolas over outdoor dining areas to covered walkways and garden features, our kits provide the framework for enhancing both the aesthetic and functionality of your outdoor space.

Modular Design for Customization

One of the standout features of our **[diy pergola kit](https://www.bjornwoodworks.com/pergola-kits)** is their modular design. Each kit includes high-quality brackets that allow for easy customization. Whether you prefer a traditional pergola design or want to incorporate unique elements like trellises or hanging plants, our kits adapt to your vision.

Easy Assembly and Durability

Simple Installation Process

Building with our **[diy pergola kits](https://www.bjornwoodworks.com/pergola-kits)** is straightforward and requires minimal tools. With step-by-step instructions and pre-cut materials, you can complete your project in a single afternoon. Our kits are designed for DIY enthusiasts of all skill levels, ensuring a hassle-free assembly experience.

Long-lasting Quality

We prioritize durability in our **[pergola kit](https://www.bjornwoodworks.com/pergola-kits)**, using materials that withstand weather conditions and maintain their beauty over time. Our brackets provide stability and strength, ensuring your pergola remains a reliable addition to your home for years to come.

Conclusion

From enhancing outdoor living spaces to adding value to your property, our DIY pergola kits offer endless possibilities for customization and enjoyment. Explore our range today and see how easy it is to create a custom outdoor structure that suits your lifestyle and enhances your home's appeal.
BitPower’s Security: Guarantee of Decentralized Smart Contracts
Published: 2024-06-28 14:33:46

As a leading cryptocurrency trading platform, BitPower focuses on security and provides a high degree of security through blockchain technology and smart contracts. On BitPower, the decentralized nature of smart contracts is particularly prominent, providing security for users' transactions and assets.

Security of blockchain
Blockchain technology uses distributed ledgers and encryption technology to ensure that every transaction is verified and recorded on multiple nodes. This decentralized architecture eliminates single points of failure and attack risks, and protects the security and privacy of user assets.

The role of smart contracts
Smart contracts are automated protocols executed on the blockchain, and their code and execution process are open and transparent. On BitPower, smart contracts can automatically execute transactions and contract terms without intermediaries, reducing the possibility of fraud and errors.

Security advantages of decentralization
No need to trust third parties: The decentralized nature of smart contracts means that the execution of transactions and contracts does not rely on a single intermediary, eliminating trust issues and intermediary risks.

Immutability of data: The results of all transactions and contract executions are recorded on an immutable blockchain, ensuring the integrity and credibility of the data.

High transparency: The code and execution process of smart contracts are visible to all participants and can be reviewed and verified by anyone, which enhances the transparency and trust of the system.

On BitPower, users can take advantage of these security features to trade cryptocurrencies and use smart contracts with confidence, ensuring the security and reliability of their assets and transactions.#BTC