teleren/devto huggingface dataset:
What are Blockchain Layers and how do they work?
Tags: beginners, blockchain, cryptocurrency, ethereum
Published: 2023-09-11 10:14:40

**INTRODUCTION**

The functionality of Blockchain technology goes beyond its usage in/for peer-to-peer transactions. Every blockchain exists in stratified layers which are meant to facilitate its functionality at an optimal level. Basically, a blockchain is made up of five (5) layers and these layers play a distinct role in achieving this. Each layer is integral to assuring the security, transparency, and efficiency of transactions, and together, they make the blockchain a system that can handle all aspects of the development process, from storing and managing data to creating and deploying applications.

Join me on this exciting read as we find out more about these layers:

**1. Hardware/Infrastructure layer:** The hardware/infrastructure layer refers to the physical framework that supports the blockchain network, which is basically made up of the nodes that contribute to the network's computing power. These nodes communicate with each other by exchanging information about the state of the network, responsible for verifying and recording transactions on the blockchain, as well as help to maintain the security and integrity of the network.

**2. Data layer:** The data layer of a blockchain network is where the transaction details are stored. Each block in the blockchain contains a set of transactions, along with other information such as the hash of the previous block and the timestamp of the block. In addition to this, the public key of the recipient and the private key of the sender are also stored in each block. The public key is used to identify the recipient of the transaction, while the private key is used to sign the transaction.

**3. Network layer:** The network layer of a blockchain network is a complex and critical part of a blockchain network that ensures that nodes can communicate with each other and that the data on the blockchain is secure. It links nodes, broadcasts transactions, and distributes data throughout the network, to ensure that all nodes in the network are aware of any transactions that take place, and this is essential for the security and transparency of the network.

**4. Consensus layer:** The consensus layer of a blockchain network ensures that all nodes in the network agree on the validity of each transaction. It does this by using a consensus mechanism, such as Proof of Work (PoW) or Proof of Stake (PoS) to maintain a set of logic that the nodes in the network follow to agree on the validity of transactions.

**5. Application layer:** The application layer is the most topmost/visible layer of the blockchain architecture. It is where applications are built, deployed, and via which users interact with the blockchain for a variety of purposes. Smart contracts, Decentralized applications (dApps), and other software such as wallets and browsers are examples of tools that run on top of the application layer.
Examples of how to use the validators module in Python
Tags: python, programming, tutorial, coding
Published: 2023-09-11 10:14:39

## Hi 🙂🖐

We know that validators are very important; they're used in many things like email, usernames, and passwords. In this post, I will share with you how to make validation by using a module called **validators**.

First, you need to install **validators**

`pip install validators`

## [1] - URL Validation

```python
import validators

print(validators.url('https://dev.to')) # True
```

`validators.url` returns true' if the URL is valid. If not validated, it will return `ValidationError`.

```python
import validators

print(validators.url('https//dev.to')) 
```
## result
```
ValidationError(func=url, args={'value': 'https//dev.to'})
```

## [2] - Email Validation

```python
import validators

print(validators.email('test@test.com')) # True
```

`validators.email` returns true' if Email is valid. If not validated, it will return `ValidationError`.


## [3] - Domain Validation
```python
import validators

print(validators.domain('test.com')) # True
```

## [4] - Card Numbers Validation

You can find Card Numbers to test from here : https://support.bluesnap.com/docs/test-credit-card-numbers

```python
import validators

print(validators.card_number('6250941006528599')) # True
```

You can choose the card type that you want to validate. You have many types, like **visa**, **Mastercard**, **Amex**


Validate Visa card number
```python
import validators

print(validators.visa('4263982640269299')) # True
```

Validate mastercard number
```python
import validators

print(validators.mastercard('5425233430109903')) # True
```

Validate amex number

```python

import validators

print(validators.amex('374245455400126')) # True
```

Now I will let you discover more. What validators can validate 🤗


**Now we're done 🤗**

**Don't forget to like and follow 🙂**

**Support me on PayPal 🤗**
https://www.paypal.com/paypalme/amr396
Add Loader in Angular6 application
Published: 2023-09-11 10:07:28

While working in any application either web or mobile, Loader is important to look cool. As it provides a different look of the entire application. Since at this decade also there are many places where you will find difficulty to get  a better internet connection. In such a condition a loader becomes very important which holds the user to wait and notifies that the request is in process.

 
Today we will discuss about loader imlementation in angular6 application with **ng4-loading-spinner** module.

### Let's Get Started

Step 1 : create angular basic app

I assume that you are familiar with this task. If not find detail about the angular app creation [here](https://jsonworld.com/demo/add-loader-in-angular6-application).

 

Step2: Install **ng4-loading-spinner**

Install the needed package by running below command over terminal

``````npm install ng4-loading-spinner``````

Step 3:  Update app.module.ts

Open app.module.ts file and add ng4-loading-spinner module to imports. Find the updated file below:


``````import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
 
import { AppComponent } from './app.component';
import { Ng4LoadingSpinnerModule } from 'ng4-loading-spinner';
 
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
Ng4LoadingSpinnerModule.forRoot()
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }``````

Step 4: Update app.component.ts 

Let's have a look on the updated code below:

``````import { Component } from '@angular/core';
 
import { Ng4LoadingSpinnerService } from 'ng4-loading-spinner';
 
@Component({
selector: 'app-root',
template: '<button (click)="show()">SHOW</button><ng4-loading-spinner> </ng4-loading-spinner>',
styleUrls: ['./app.component.css']
})
export class AppComponent {
constructor (private spinnerService: Ng4LoadingSpinnerService){}
title = 'angular-loader';
 
show()
{
this.spinnerService.show();
setTimeout(()=>this.spinnerService.hide(),3000)
}
 
}``````

Step 5: Run the app

After making above changes in the file, run the app with npm start. Will see the loader like below :


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/baxrfcj0xk46vyejywpg.png)

### Conclusion

So in this demo, We  learn to add loader in the angular application very easily. Find here other [angular6-sample-application](https://jsonworld.com/demo/add-loader-in-angular6-application) here

 

That’s all for now. Thank you for reading and I hope this demo will be very helpful to understand create loader in angular6 application.

Let me know your thoughts over the email demo.jsonworld@gmail.com. I would love to hear them and If you like this article, share with your friends.

This article is originally posted over [jsonworld](jsonworld.com)
JavaScript Best Practices: Code Like a Pro!📝
Tags: javascript, webdev, programming, productivity
Published: 2023-09-11 10:01:09

**Hey there! Let's talk about some awesome JavaScript best practices! 🚀**

JavaScript is a versatile and powerful programming language used to enhance the interactivity and functionality of websites. To write efficient and maintainable code, it's crucial to follow best practices. Here are some key recommendations:

1. **Naming is Everything**:
   - Make your variable and function names descriptive. It's like giving your code a good map!

   ```javascript
   // Nice and clear
   let userAge = 25;
   
   function calculateTotalPrice(itemPrice, quantity) {
       return itemPrice * quantity;
   }

   // Not so clear
   let a = 25;
   
   function calc(x, y) {
       return x * y;
   }
   ```

2. **Keep it Local**:
   - Global variables can be troublemakers. Try to keep things confined to modules or namespaces. It's like putting your code in little boxes!

   ```javascript
   // Not recommended
   let globalVariable = 'some value';

   // Better
   const myModule = {
       myVariable: 'some value',
       myFunction() {
           // ...
       }
   };
   ```

3. **Strict Mode for the Win**:
   - Use strict mode to catch those sneaky bugs and keep your code on track.

   ```javascript
   'use strict';

   // Your code here
   ```

4. **No Magic Tricks**:
   - Avoid using numbers or strings without context. Give them a name!

   ```javascript
   // Magic Number
   if (score > 70) {
       // ...
   }

   // Much better
   const PASSING_SCORE = 70;
   if (score > PASSING_SCORE) {
       // ...
   }
   ```

5. **Divide and Conquer**:
   - Break your code into smaller, reusable parts. It's like building with LEGO blocks!

   ```javascript
   // Before
   function doSomething() {
       // ...
   }

   function doSomethingElse() {
       // ...
   }

   // After
   function doSomething() {
       // ...
   }

   function doSomethingElse() {
       // ...
   }
   export { doSomething, doSomethingElse };
   ```

6. **No `eval()` Drama**:
   - Avoid `eval()` like the plague. It can lead to trouble. There's almost always a safer way!

7. **Handle Errors like a Pro**:
   - Don't let errors crash your party. Catch them and deal with them gracefully!

   ```javascript
   try {
       // Code that may throw an error
   } catch (error) {
       // Handle the error
   }
   ```

8. **Loop Like a Boss**:
   - Loops matter! Use the right one for the job and don't waste unnecessary processing power.

   ```javascript
   // Not the best
   for (let i = 0; i < array.length; i++) {
       // ...
   }

   // Much cleaner
   for (const item of array) {
       // ...
   }
   ```

9. **Test, Test, Test**:
   - Testing is your best friend. Use frameworks like Mocha, Jasmine, or Jest to keep your code in check!

10. **Stay Fresh with JavaScript**:
    - Keep up with the latest JavaScript features. It's like upgrading to a faster car!

Remember, coding is an adventure! These practices will help you navigate the JavaScript landscape smoothly. Happy coding! 🎉👨‍💻
Connect with Engg Students, Coimbatore
Tags: motivation, inspiration, leadership, beginners
Published: 2023-09-11 09:59:43

𝐃𝐨𝐞𝐬 𝐲𝐨𝐮𝐫 𝐜𝐮𝐫𝐫𝐞𝐧𝐭 𝐩𝐚𝐭𝐡 𝐚𝐥𝐢𝐠𝐧 𝐰𝐢𝐭𝐡 𝐲𝐨𝐮𝐫 𝐮𝐥𝐭𝐢𝐦𝐚𝐭𝐞 𝐚𝐬𝐩𝐢𝐫𝐚𝐭𝐢𝐨𝐧?

My answer is a 𝐛𝐢𝐠 𝐘𝐄𝐒 𝐰𝐢𝐭𝐡 𝐚 𝐩𝐨𝐬𝐢𝐭𝐢𝐯𝐞 𝐚𝐟𝐟𝐢𝐫𝐦𝐚𝐭𝐢𝐨𝐧 when a Saturday was well spent with first-year engineering students' induction.

Here is how
👨‍🎓👩‍🎓 When I had an invite from my professor Dr.M.G. Sumithra, now Principal at Sri Krishna College of Technology

👨‍🎓👩‍🎓 When wondering what to address the students, mam said "Just share your journey and see the response, Bhuvana"

👨‍🎓👩‍🎓 Unbelievably 1-hour session with 1100+ first year Engineering students went up to 2-hours 🙏

👨‍🎓👩‍🎓 Got goose-bumps with students' interaction running over their lunch breaks

👨‍🎓👩‍🎓 Important aspects to note are
⭐ Almost 1/3 of the students are going to be first graduates 📚
⭐ Close to 50 students are from #tamilnadu governments 7.5 scheme free seats.
⭐ 8 Students from Sujith Kumar's https://lnkd.in/gjNtMtUJ

👨‍🎓👩‍🎓 Couple of promise exchanges
⭐ My promise to publish a budding poet's debut book 📔
⭐ A state-level awardee-winning painter, Brinda, expressed to send one of her paintings 💛
⭐ Many students promised to share their milestones.

The most important feedback was from the whole week's programme, which was very interactive.

Thanks to Intuitive.Cloud management, Jay Ashok Modh and Indraneel Shah for your constant support and encouragement to spearhead such Global Outreach programmes.

**Social Media Links:**
Twitter, FaceBook, LinkedIn

**Twitter:**
{% embed https://twitter.com/installjournal/status/1700839713287139704 %}

**Facebook:**
{% embed https://www.facebook.com/100000322342168/videos/1050448642786624/ %}

**LinkedIn:**
{% embed https://www.linkedin.com/embed/feed/update/urn:li:ugcPost:7106549364679999488 %}

[Youtube link](https://youtu.be/W-PEbXwDv2I)

**Gallery:**

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/czsvpeqzg1stzflnity6.jpeg)


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/mojxsebxx0yijf7zejo9.jpeg)


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/x2xc0d53akn3jldav3a4.jpeg)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/zk9bpykd31t8kqt50qyx.jpg)


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/mo9crk5jj20buguoo1e9.png)

#students #motivation #coimbatore #tamilnadu
Advanced Features of PostgreSQL (Part 01)
Tags: apacheage, postgres, devcommunity, bitnine
Published: 2023-09-11 09:52:46

## Introduction:
We will now discuss some more advanced features of SQL that simplify management and prevent loss or corruption of your data. We will discuss some PostgreSQL extensions aswell.
Some examples from this chapter can also be found in advanced.sql in the tutorial directory. This file also contains some sample data to load.

## Views:
Suppose the combined listing of weather records and city location
is of particular interest to your application, but you do not want to type the query each time you need
it. You can create a view over the query, which gives a name to the query that you can refer to like an
ordinary table.

Views allow you to encapsulate the details of the structure of your tables, Making liberal use of views is a key aspect of good SQL database design.
Views can be used in almost any place a real table can be used. Building views upon other views is not uncommon.

## Foreign Keys:
You want to make sure that no one can insert rows in the weather table that do not have a matching entry in
the cities table. This is called maintaining the referential integrity of your data. In simplistic database
systems this would be implemented (if at all) by first looking at the cities table to check if a matching
record exists, and then inserting or rejecting the new weather records.

## Transactions:
It is a fundamental concept of all database systems. The essential point of a transaction is that it bundles multiple steps into a single, all-or-nothing operation. The intermediate states between the steps
are not visible to other concurrent transactions, and if some failure occurs that prevents the transaction
from completing, then none of the steps affect the database at all.
When the transaction is done and acknowledged by the database system, it has been permanently recorded and not being lost if ever crash in system. Another important property of transactional databases is closely related to the notion of atomic updates. when multiple transactions are running concurrently, each one should not be able to see the incomplete changes made by others.
In PostgreSQL, a transaction is set up by surrounding the SQL commands of the transaction with BEGIN and COMMIT commands.
If partway through the transaction, we decide we do not want to commit we can issue the command ROLLBACK instead of COMMIT, and all our updates so far will be canceled.
Tips to Overcome Test Automation Challenges
Tags: testing, softwaredevelopment, developer, gamedev
Published: 2023-09-11 09:49:28

Automation testing is a highly effective tool that could speed up the software testing procedure and lead to a boost in productivity, In our last article, we have pointed out some of the common challeges in test automation. If these issues are not addressed properly, it is possible that software testing might get failed. So we will also offer some solutions and tips to overcome these test automation challenges.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/dyitje0enoo3kk4lw3nf.png)



**1. Investing progressively in automation tools**
It is always advised to invest progressively and adopt automation tools. We do not suggest invest all at once to overcome the challenge of high initial investment costs.

**2. Using industry-leading test automation tools**
You could choose the industry-leading tools as they are trusted and used by some leading companies to overcome the challenge of selecting the right automation testing tool. Besides, these tools has excellent community support.

**3. Ensuring Adequate Test Automation Coverage**
The infrastructure can help ensure the appropriate amount of coverage. When testing applications against multiple browsers and operating system combinations, test scripts must run in parallel to run each test against the configuration in a reasonable amount of time.

**4. Communicating and Collaborating with teammates effectively**
We must present the cost and benefit analysis and the Return on Investment (ROI) analysis to the upper management team. You could also embrace and adopt DevOps processes that break the silos between developers and testers and ensure seamless collaboration.

With WeTest Automation, automation becomes easier and solves most of the problems mentioned in last articl. Experience WeTest automation in action by signing up for a free trial today, [Click Here](https://www.wetest.net/products/automation/?utm_source=tw&utm_medium=AM-TW-3).
🌟 Exploring AWS EKS Fargate: A Journey into Serverless Kubernetes 🚀
Tags: aws, containers, fargate
Published: 2023-09-11 09:48:59



Hello AWS Enthusiasts,

Today, let's embark on an educational journey into the world of AWS EKS Fargate, where we'll uncover the transformative power of serverless Kubernetes. 🌐

🌟 What is EKS Fargate?

Amazon Elastic Kubernetes Service (EKS) Fargate is a game-changing approach to managing Kubernetes clusters. It brings the serverless concept to container orchestration, eliminating the need to grapple with underlying EC2 instances. Here's what makes it remarkable:

⚙️ No EC2 Instances: Forget about provisioning and managing EC2 instances; EKS Fargate abstracts all that complexity away.

⚖️ Auto Scaling: Resource scaling becomes effortless. Fargate dynamically adjusts resources according to your workloads, optimizing performance and cost.

🔒 Security, First: Security remains paramount. EKS Fargate offers the same robust security features as traditional EKS clusters, ensuring your applications run in isolation.

🚀 Focus on Innovation: With infrastructure concerns out of the picture, your team can channel their energy into innovation. Develop, deploy, and scale containerized apps with newfound agility.

🌐 Global Reach: Deploy applications closer to your users by leveraging multiple AWS regions for improved latency and user experience.

🤔 Why Does This Matter?

Speed: Quickly deploy and scale applications without infrastructure roadblocks.
Cost Efficiency: Eliminate the need to provision and manage EC2 instances, leading to cost savings.
Simplified Operations: Devote more time to building, and less to infrastructure management.
Security: Rest assured with AWS's robust security controls.

🌱 Getting Started:

Curious about exploring EKS Fargate? Start your journey by diving into the documentation and experimenting. Join the conversation to share insights and learn together.

🚀 Explore EKS Fargate:

https://docs.aws.amazon.com/AmazonECS/latest/userguide/what-is-fargate.html

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/3ua88ouweimcnu6dug08.png)
Jenkins Enterprise Support & Consulting Experts
Tags: jenkins, jenkinssupport
Published: 2023-09-11 09:46:49

Are you looking to supercharge your CI/CD pipelines with Jenkins? Look no further! InfraCloud, trusted by leading companies, offers expert Jenkins consulting and enterprise support to streamline your development lifecycle and boost automation.

## Benefits of Jenkins Commercial Support

- CI/CD to Adopt Fail-Fast Approach: Accelerate your development process and quickly identify issues.
- Faster Development Lifecycle: Reduce manual efforts and speed up your software development.
- Reduced Delivery Time: Get your products to market faster.
- Increased Automation: Boost efficiency with automated processes.
- CI Customizations with Multiple Plugins Support: Tailor Jenkins to your specific needs.
- Third-Party Tools Integration: Seamlessly integrate Jenkins with your existing toolset.

## Our Jenkins Consulting + Enterprise Support Capabilities

Automate your CI/CD with Best Practices
Our Jenkins experts analyze your framework and make recommendations to get your CI/CD pipelines automated, up and running.

Implement DevOps Efficiently with Jenkins
With Jenkins now as a tool at your disposal, implement DevOps efficiently by integrating it with different platforms and a shift-left approach.

Improving Development Lifecycle
Using Jenkins, we help you reduce your developer’s efforts immensely, with Branch Acceptance Testing (BAT), you can improve the speed of development by relying on Jenkins to do all the redundant work.

Improved Delivery Time
With continuous integration and continuous delivery via Jenkins, we can improvise the release and artifact delivery time to a great extent.

Jenkins Training & Enterprise Support
Our Jenkins experts will help your team to get up to speed on Jenkins best practices and knowledge transfer to drive future automation.

## Trusted by Global Enterprises & Startups
InfraCloud has earned the trust of companies like Sunpower, Taos, Coinsquare, and more. Our team boasts:

- Certified Developers with in-house engineers.
- Extensive domain expertise with insights from 100+ clients.
- First-mover advantage as India's first Kubernetes service provider.
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- Easy scalability without the hassle of hiring or training.

## Ready to Transform your Business with Jenkins?

[Schedule a call with one of our Jenkins experts to understand how our Jenkins can help you.](https://www.infracloud.io/jenkins-consulting-support/)