teleren/devto huggingface dataset:
Creating a Python Function to Evenly Split a Range of Numbers
Tags: webdev, python, beginners
Published: 2023-11-21 15:26:47

This article explains how to create a Python function that evenly splits a given range of numbers and returns the intervals as a list. This function is useful when you need to divide a numerical range into equal segments.

#### Function Specifications
- **Return Value**: A list of evenly divided intervals (e.g., `[[1,3], [4,6], [7,9], [10,12]]`)
- **Arguments**:
  - `end`: The end point of the range to be divided (12 in this example)
  - `parts`: The number of segments to divide into (3 in this example)

#### Implementation
The function uses the `range` function and list comprehension to divide the specified range into equal parts. Here is the implementation:

```python
def split_range(end, parts):
    step = end // parts
    return [[i + 1, min(i + step, end)] for i in range(0, end, step)]

# Example usage of the function
result = split_range(12, 3)
print(result)  # [[1, 3], [4, 6], [7, 9], [10, 12]]
```

#### Explanation of the Function
- The `split_range` function divides the given range into `parts` number of equal segments.
- The variable `step` calculates the size of each segment. In this example, it is `12 // 3 = 4`.
- List comprehension is used to calculate the start and end points of each segment and add them to the list.
- This function is handy when you need to evenly split a range of numbers for tasks like batch processing of data or analyzing specific numerical ranges.

#### Use Cases
This function can be useful, for example, when you need to batch process data or analyze a specific numerical range in equal segments. It can be used in situations like data batch processing or segmenting a range for analysis.
Recursividade em JS/TS
Tags: javascript, tutorial, typescript
Published: 2023-11-21 15:13:34

## Mas o que é recursividade ?
De acordo com o _Wikipedia_, recursividade nada mais é do que: 

> Um termo geralmente usado para descrever o processo de repetição de um objeto de um jeito similar ao que já fora mostrado. Um bom exemplo disso são as imagens repetidas que aparecem quando dois espelhos são apontados um para o outro.

## Mas e em JS/TS?
Recursividade em JS/TS nada mais são do que funções ou tipagens que se repetem até a instruçāo terminar, podendo estar presente em funções, nas chamadas funções recursivas, e em tipagens.

### Exemplo

Suponhamos que temos um Array de Arquivos(File) e Pastas(Folder), e precisamos mostrar um `console.log()` com o nome de cada um:

Primeira coisa que precisamos é um criar uma Tipagem para o que iremos receber em nossa função recursiva:

```ts
type Item = {
  id: string
  name: string
  // Se tem Children é um Folder, se não é um File.
  children?: Item[]
}
```

Como você pode ver, utilizamos a recursivdade pois setamos o tipo para `children` como `Item[]`, ou seja, criando uma recursividade, um encadeamento.

E para nossa função teremos algo desse tipo:

```ts
const showFileAndFolders = (items: Item[]) => {
  // Percorrer todos os items.
  items.forEach(item => {

    // Se tem Children é um Folder, se não é um File.
    if (item.children) {
      // Sendo um folder mostro o nome e chamo novamente a função para contemplar o `children`
      console.log('Folder: ', item.name)

      // Recursividade, chamamos a função dentro dela mesma.
      showFileAndFolders(item.children)
      
      return;
    } else {
      // Sendo um file mostro o nome
      console.log('File: ', item.name)
      return; 
    }
  })
}
```

## Outros exemplos
Utilidades famosas da recursividade também podem ser encontradas em casos como:

### Sequência de Fibonacci
```js
const generateFibonacci = (num: number) => {
  if (num <= 1) return n;
  return generateFibonacci(num - 1) + generateFibonacci(num - 2);
}
```
How to Execute Multiple Processes in Parallel Using AWS Lambda from a Script
Tags: webdev, python, boto, beginners
Published: 2023-11-21 15:08:51

#### Implementing Parallel Processing

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/xngom6uh9u5re14e47ea.png)


1. **Creating a Script to Invoke Lambda Functions**
   - First, create a script in your programming language of choice (e.g., Python, Node.js) to invoke Lambda functions.
   - Use the AWS SDK in your script to access Lambda functions.
   - For example, in Python, import the `boto3` library and create a Lambda client.

2. **Parallel Execution Using Asynchronous Processing**
   - Use asynchronous processing to invoke multiple Lambda functions simultaneously.
   - To run Lambda functions in parallel, set the asynchronous invocation in your script (`InvocationType='Event'`).
   - This allows each Lambda function to execute independently in parallel, while the script moves on without waiting for each invocation to complete.

```python
import boto3

lambda_client = boto3.client('lambda')

def invoke_lambda_async(function_name, payload):
    return lambda_client.invoke(
        FunctionName=function_name,
        InvocationType='Event',
        Payload=json.dumps(payload)
    )

# Asynchronously invoking multiple Lambda functions in parallel
responses = [invoke_lambda_async('my_lambda_function', {'key': 'value'}) for _ in range(5)]
```
How to Install Matplotlib in Python?
Tags: python, programming, tutorial
Published: 2023-11-21 14:50:37

[How to Install Matplotlib in Python?](https://www.almabetter.com/bytes/articles/how-to-install-matplotlib-in-python)

To install Matplotlib in Python, you can follow these simple steps. Matplotlib is a popular data visualization library that allows you to create a wide range of plots and charts.

Step 1: Check Your Python Installation
Before installing Matplotlib, ensure you have Python installed on your system. Open your terminal or command prompt and enter the following command to check your Python version:
python --version
If Python is not installed, download and install it from the official Python website: https://www.python.org/downloads/

Step 2: Open a Terminal or Command Prompt
Open a terminal or command prompt on your computer. The exact method varies depending on your operating system.

Step 3: pip install Matplotlib in Python
To install Matplotlib, you can use Python's package manager, pip. Enter the following command:

pip install matplotlib
This command will download and install Matplotlib and its dependencies. Wait for the installation process to complete.

Step 4: Verify the Installation
After the installation, you can verify it by running a simple Python script. Create a Python script (e.g., verify_matplotlib.py) with the following content:

import matplotlib.pyplot as plt
plt.plot([1, 2, 3, 4])
plt.ylabel('Some numbers')
plt.show()
Save the script and run it using the following command:

python verify_matplotlib.py
If Matplotlib is correctly installed, a window displaying a simple plot should appear.

That's it! You've successfully installed Matplotlib in Python and are now ready to create beautiful data visualizations in your Python projects.

In conclusion, we've provided you with a straightforward guide on how to install Matplotlib in Python 3.6. Following these steps, you've learned how to set up the Matplotlib library in Python, an essential skill for anyone pursuing a [Python tutorial](https://www.almabetter.com/bytes/tutorials/python) or a [Data Science course](https://www.almabetter.com/courses/full-stack-data-science).
Database server communication and data migration from one database to another server database in SQL server
Tags: webdev, programming, sql, databse
Published: 2023-11-21 14:50:31

Sure, I can guide you through the process of communicating between database servers and migrating data from one database to another in SQL Server.

### Communication between Database Servers

#### Linked Servers:
- **Creating Linked Servers:** You can establish a linked server in SQL Server to communicate with another server. This allows you to execute distributed queries, access tables from different servers, and perform data migration or manipulation across servers.
- **Syntax:** To create a linked server, you can use the `sp_addlinkedserver` stored procedure.
  
  Example:
  ```sql
  EXEC sp_addlinkedserver   
    @server='LinkedServerName', 
    @srvproduct='',
    @provider='SQLNCLI', 
    @datasrc='ServerName\InstanceName';
  ```

### Data Migration between Servers

#### Import/Export Wizard:
- **Using SQL Server Management Studio (SSMS):** The Import/Export Wizard is a graphical tool that allows you to transfer data between SQL Server instances.
- **Steps:** In SSMS, right-click the source database, select `Tasks`, and choose `Export Data` or `Import Data`. Follow the wizard to specify the source and destination servers, tables, and data transfer options.

#### SQL Scripts:
- **Generate SQL Scripts:** You can generate scripts to migrate schema and data from one database to another.
- **Steps:** Right-click the source database, select `Tasks`, and choose `Generate Scripts`. Select the desired objects (tables, views, etc.), specify the script options, and save the generated script. Execute the script in the target database to recreate the schema and insert data.

#### SSIS (SQL Server Integration Services):
- **Creating Packages:** SSIS provides a comprehensive platform for creating data integration and workflow applications. You can create packages to migrate data between servers.
- **Steps:** Open SQL Server Data Tools, create a new Integration Services Project, design the data flow tasks to extract data from the source, and load it into the destination database.

### Example of Migrating Data using SQL Scripts:

Let's assume you have two databases - `SourceDB` and `DestinationDB` on different servers.

1. Generate Script for SourceDB:
   - Generate a script for the tables you want to migrate (`SourceTable1`, `SourceTable2`, etc.) including schema and data.

2. Execute Script in DestinationDB:
   - Connect to the destination server and database (`DestinationDB`).
   - Execute the script generated from the source database in the destination database to create tables and insert data.

Remember to handle potential differences in the schema, data types, and constraints between the source and destination databases while performing the migration.

Always backup your data before performing any major data migration or manipulation to avoid accidental data loss or corruption.
Session Management in VMS when we integrate the Load balancer in Azure Cloud
Tags: azure, webdev, programming, cloudcomputing
Published: 2023-11-21 14:47:38

In a Virtual Machine Scale Set (VMSS) setup in Azure Cloud with a load balancer, session management becomes crucial for ensuring a smooth and efficient distribution of traffic among instances. Azure Load Balancer operates at the Transport Layer (Layer 4) of the OSI model and supports two main types:

1. **Azure Basic Load Balancer**: It routes traffic based on network information such as IP address and port. For this type of load balancer, session persistence or sticky sessions might not be directly supported.

2. **Azure Standard Load Balancer**: This provides more advanced traffic distribution options, including Layer 4 and Layer 7 load balancing. With Standard Load Balancer, you can achieve session affinity by configuring backend pools and defining session persistence settings.

Here are some considerations for session management in a VMSS integrated with a load balancer:

1. **Session Affinity or Sticky Sessions**: Ensure that subsequent requests from a client are directed to the same backend instance to maintain session state. In Azure, this can be configured using the load balancer's session persistence settings.

2. **Configuration**: Configure the load balancer's backend pool settings to maintain session affinity based on client IP addresses, cookies, or other identifiers. This can usually be set up through Azure Resource Manager templates, PowerShell, Azure CLI, or the Azure portal.

3. **Health Probes and Autoscaling**: Define health probes to monitor the status of backend instances. This ensures that only healthy instances receive traffic. Coupled with autoscaling configurations, new instances can be spun up when needed, and the load balancer will distribute traffic accordingly.

4. **Backend Instance Configuration**: Ensure that your application instances are configured to handle session persistence or shared session states, especially if your application spans multiple VM instances.

5. **Testing and Monitoring**: Regularly test your setup to ensure that session management is working as expected. Monitor the load balancer metrics, VMSS health, and application logs to identify and resolve any issues promptly.

Remember that the exact configuration might vary based on your specific use case, application requirements, and the type of load balancer being used. Azure's documentation and support resources can provide detailed guidance based on your setup and requirements.
How we can use order by Query with a database table without using the Column name
Tags: webdev, programming, sql, database
Published: 2023-11-21 14:40:07

Using `ORDER BY` without specifying a column name can be ambiguous because it's typically used to sort the data based on certain columns in a database table. However, there might be scenarios where you want to order by a specific position of the column in the table or a computed value.

One approach could involve using the column index in some databases. For instance, in MySQL, you can refer to columns by their positions:

```sql
SELECT * FROM your_table
ORDER BY 1; -- Orders the result set by the first column
```

However, relying on column positions can be risky as changes to the table structure might affect the ordering unexpectedly.

Another method might involve using expressions or functions to generate a derived column to sort:

```sql
SELECT * FROM your_table
ORDER BY (some_column + 10); -- Orders the result set by a computed value based on 'some_column'
```

This example demonstrates sorting based on the sum of a column (`some_column`) and a constant value (`10`). You can use various other functions or calculations to create a custom sorting logic.

Remember, while these methods might technically allow you to sort without explicitly specifying column names, they are not standard practices and might lead to confusion and maintenance issues. It's generally advisable to use clear and explicit column names in `ORDER BY` clauses for better code readability and maintainability.
Link Server in SSMS
Tags: webdev, programming, sqlserver, database
Published: 2023-11-21 14:37:29

To link a server in SQL Server Management Studio (SSMS), follow these steps:

1. Open SSMS.
2. In the Object Explorer, right-click on the "Server" node and select "New Server Registration."
3. The "Connect to Server" window will appear. Enter the necessary details:
   - Server type: Choose the type of server you want to connect to (e.g., Database Engine, Analysis Services, etc.).
   - Server name: Enter the name or IP address of the server you want to link to.
   - Authentication: Select the appropriate authentication method (Windows Authentication or SQL Server Authentication).
   - Login: Provide the login credentials if using SQL Server Authentication.
4. Click "Connect" to establish the connection.

Once connected, you'll see the linked server listed in the Object Explorer, allowing you to interact with its databases, tables, and other objects.

Keep in mind that you'll need the necessary permissions and network access to connect to the remote server successfully.
Why do we use indexes in the database SSMS?
Tags: webdev, sqlserver, database, programming
Published: 2023-11-21 14:36:21

Indexes in a database, including within SQL Server Management Studio (SSMS), are used to enhance the performance of queries. They act like a table of contents in a book, allowing the database engine to quickly locate data without having to scan the entire table. Here are a few reasons why indexes are essential:

1. **Faster Data Retrieval**: Indexes help retrieve data more quickly by providing a quick path to the rows that match certain criteria in a query. Without indexes, the database might need to scan the entire table, which can be slow, especially for large tables.

2. **Improved Query Performance**: Queries that involve filtering, sorting, or joining tables can benefit significantly from indexes. They allow the database engine to efficiently locate and retrieve the necessary data rows.

3. **Reduced I/O Operations**: Indexes reduce the number of I/O operations required to fetch data. Instead of scanning the entire table, the database can read the index structure, which is usually smaller and fits into memory better.

4. **Enforcement of Uniqueness and Constraints**: Unique indexes ensure that a column or combination of columns contains unique values, enforcing data integrity. They are often used to enforce primary key constraints.

5. **Support for Ordered Retrieval**: Some indexes, like clustered indexes, physically order the rows in the table based on the index key. This can speed up queries that require retrieving data in a specific order.

However, it's important to note that while indexes can significantly improve query performance, they also come with trade-offs. They occupy additional disk space, can slow down data modification operations (such as INSERT, UPDATE, and DELETE), and maintenance might be required to keep them optimized.

In SSMS, you can create, modify, or drop indexes using SQL commands or the graphical interface. Understanding the database schema, query patterns, and workload is crucial for designing and implementing effective indexes to optimize performance without introducing unnecessary overhead.
Cypress JavaScript Tutorial: A Step-By-Step Handbook for "beginners" and "seasoned" qa/developers
Tags: testing, qa, javascript, beginners
Published: 2023-11-21 14:30:48

Discover how the combination of Cypress and JavaScript can be effectively utilized for:

(https://dzone.com/articles/cypress-javascript-tutorial-a-step-by-step-handboo)

✨ User Interface (UI) Testing
✨ Application Programming Interface (API) Testing
✨ Accessibility Testing
✨ Component Testing
✨ Mobile Responsiveness Testing
How to share data between different instance of same DLL
Tags: cpp
Published: 2023-11-21 14:30:41

Usually Dlls are loaded into its corresponding process address space. Indeed the code is shared between all instances but not the global data. So the issue that we might face is – how can we share common data between all dll instances?

```
#pragma data_seg (".MYSEG")
    int g_nInteger = 0;
    char g_szString[] = "hello world";
#pragma data_seg()

// Tell the linker that the section
// .MYSEG is readable, writable and is shared.
#pragma comment(linker, "/SECTION:.MYSEG,RWS")
```
Here we are declaring our data segment and are telling that, this segment is RWS – readable, writable and shared. This way we manage to share this data segment between all dll instances.
NextJs 14 with antd 5.11
Tags: javascript, nextjs, antd, beginners
Published: 2023-11-21 13:51:01

Hello everyone,

Today I will guide you how we can implement antd in NextJs 14.

Recently I was working on a client project, there we are using NextJs 12 version and antd 4.20.2 version, I got a task, I have to update our NextJs version to 14, because our web app NextJs 12 was very slow and we have to upgrade the version.

There is a lot of fantastic updates in NextJs 14, you can see on this [link](https://nextjs.org/blog/next-14)

First I have a problem with antd because Ant Design's CSS is loading after the page is rendered, causing a flash of unstyled content in next Js 14. I searched a lot of articles but couldn't find anything right related to this.

I saw few updates in antd on [antd documentation](https://ant.design/docs/react/use-with-next) 

Here is the steps, how we can implement antd in our NextJs 14 app.

**Step 1:**

```
npx create-next-app@latest
```

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/jesd21x3vawt7b6u29t9.png)

**Step 2:**

```
npm install antd
```

**Step 3:**

```
npm install @ant-design/cssinjs
```

**Step 4:**

Create `lib/AntdRegistry.tsx` in your src directory

```
'use client';

import React from 'react';
import { createCache, extractStyle, StyleProvider } from '@ant-design/cssinjs';
import type Entity from '@ant-design/cssinjs/es/Cache';
import { useServerInsertedHTML } from 'next/navigation';

const StyledComponentsRegistry = ({ children }: React.PropsWithChildren) => {
  const cache = React.useMemo<Entity>(() => createCache(), []);
  const isServerInserted = React.useRef<boolean>(false);
  useServerInsertedHTML(() => {
    // avoid duplicate css insert
    if (isServerInserted.current) {
      return;
    }
    isServerInserted.current = true;
    return <style id="antd" dangerouslySetInnerHTML={{ __html: extractStyle(cache, true) }} />;
  });
  return <StyleProvider cache={cache}>{children}</StyleProvider>;
};

export default StyledComponentsRegistry;
```

**Step 5:**

Update your `layout.tsx` file

```
import React from 'react';
import { Inter } from 'next/font/google';

import StyledComponentsRegistry from '../lib/AntdRegistry';

import '@/globals.css';

const inter = Inter({ subsets: ['latin'] });

export const metadata = {
  title: 'Create Next App',
  description: 'Generated by create next app',
};

const RootLayout = ({ children }: React.PropsWithChildren) => (
  <html lang="en">
    <body className={inter.className}>
      <StyledComponentsRegistry>{children}</StyledComponentsRegistry>
    </body>
  </html>
);

export default RootLayout;
```

NextJs documentation: https://nextjs.org/docs/app/building-your-application/routing
Github repo: https://github.com/AhmadFaraz-crypto/NextJs-14-with-antd-5.11