teleren/devto huggingface dataset:
Amazon ElastiCache for Redis
Tags: aws, cloudcomputing, cloudskills, devops
Published: 2023-07-01 15:09:22

![Day16](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/lklueztzqannigumvpae.png)

[16/30] #30DaysOfAWS Today, Amazon ElastiCache for Redis.

**Amazon ElastiCache for Redis** is a fully managed, Redis-compatible in-memory data store service that delivers high performance, scalability, and availability for demanding applications. ElastiCache is easy to set up, operate, and scale a Redis cache in the cloud.

Here are some of the benefits of using Amazon ElastiCache for Redis:

- **High performance** - Amazon ElastiCache for Redis offers sub-millisecond latency and throughput of up to 100,000 requests per second per node.

- **Scalability** - Amazon ElastiCache for Redis can be scaled up or down to meet changing demand. You can add or remove nodes in minutes, without any downtime.

- **Availability** - Amazon ElastiCache for Redis is highly available and can withstand the loss of up to two nodes in a cluster without affecting availability.

- **Security** - Amazon ElastiCache for Redis offers a variety of security features, including encryption at rest and in transit.

Here are some of the common use cases for Amazon ElastiCache for Redis

- **Caching** - Amazon ElastiCache for Redis can be used to cache frequently accessed data, such as user profiles, product catalogs, and search results. This can improve the performance of your applications by reducing the number of times they need to access the underlying database.

- **Session stores** - Amazon ElastiCache for Redis can be used to store session data, such as user login information and shopping cart contents. This can help to improve the scalability and availability of your applications by offloading session data from your web servers.

- **Gaming** - Amazon ElastiCache for Redis can be used to store game state data, such as player positions and scores. This can help to improve the performance and responsiveness of your games.

- **Geospatial services** - Amazon ElastiCache for Redis can be used to store geospatial data, such as maps and location information. This can be used to power features such as location-based search and routing.

- **Real-time analytics** - Amazon ElastiCache for Redis can be used to store real-time data, such as sensor data and social media feeds. This data can be used to power real-time analytics applications, such as fraud detection and market trend analysis.

If you are looking for a high-performance, scalable, and available in-memory data store, Amazon ElastiCache for Redis is a great option.

**Step-by-step tutorial** for how to create Amazon ElastiCache for Redis Cluster. You can download it using this [URL](https://lasantha-fileshare-s3-932747549174-v1.s3.us-east-2.amazonaws.com/AmazonElastiCacheforRedisCreation.pdf).

[Sample Codes](https://gist.github.com/sanju2/5ec2764cf73b247c99b30d37a2909ee5)

Learn More [URL](https://aws.amazon.com/elasticache)

Thanks for reading the Article.

[LinkedIn](https://www.linkedin.com/in/lasanthasilva)

[Twitter](https://twitter.com/LasanthaSilva96)
Simple CPU Simulator
Tags: cpu, python
Published: 2023-07-01 15:06:53

As part of my final project for the computer architecture module of the computer science path in codecademy, I have made a simple CPU simulator in python.

I have created classes the mimic the functionalities of a CPU and memory bus. The CPU has register that is randomly initialized with values between 0 and 100. I have put the instructions in a txt file. I fetch and parse these instructions from the input file.

I have implemented the following MIPS instructions:
- ADD with operands Rd Rs Rt
- SUB with operands Rd Rs Rt
- HLT with no operands

ADD is for adding register values. SUB is for subtracting register values and HLT is to halt the CPU.

Once started, the file is lodaed, the insctructions are executed. The initials register values are displayed, the single execution steps are displayed and the final register values are displayed.

Obviously, there are lot of things that can still be added like more instructions, error handling, cache, input validation, …

You can get the code here:
[https://github.com/ptrick72/CPU_Simulator](https://github.com/ptrick72/CPU_Simulator)
This new HTML attribute will help you with loading states
Tags: html, css, webdev, javascript
Published: 2023-07-01 14:57:50

Staying up to date with the latest developments in our standard web languages can be challenging, isn't it? However, I recently came across a new feature that proves to be immensely helpful for several use cases.

## The new `inert` attribute

The `inert` attribute is a powerful new boolean attribute designed to provide precise control over the interactivity of an element. Its functionality allows developers to effortlessly determine when an element should be interactive or non-interactive, so no more `user-select: none` or `pointer-events: none`!

**The best thing about this**: Additionally, the `inert` attribute serves as an event and event bubbling inhibitor, while also deactivating focusing elements. This remarkable feature eliminates the need to individually disable children or manage event handlers on the element itself!

## What could this be used for?

One of the primary applications that immediately comes to mind is utilizing the `inert` attribute for form elements. Consider a scenario where you have a form that submits data via fetch. Previously, you would have had to individually disable each input element or the entire form while also taking measures to prevent events from being triggered by the form or its inputs.

Now, with the introduction of the `inert` attribute, achieving this functionality is incredibly simple. By just adding `<form inert>` to the form element, you can effectively disable any interactive behavior associated with it during the submission process.

Furthermore, leveraging the inert attribute opens up exciting possibilities for user interface design. You could opt to style the elements with the `inert` attribute as transparent, giving users a clear visual cue that these elements are currently non-interactive. This enhances user understanding and provides a more intuitive user experience overall.

## Code Example

```html
<form inert>
  <!-- your form content here -->
</form>
```

```css
@keyframes loading {
  0% {
    opacity: .3;
  }
  50% {
    opacity: .5;
  }
  100% {
    opacity: .3;
  }
}

form[inert] {
  animation: loading 1s forwards infinite linear;
  opacity: .3;
}
```

## Further reads

- [MDN](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/inert)
Cample.js benchmark (js-framework-benchmark)
Tags: webdev, javascript, typescript, programming
Published: 2023-07-01 14:47:02

Hi all! In this article, I would like to share a benchmark of the cample.js framework, which works on reactivity without a virtual DOM (version 3.0.1).

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/hktv24a40u865fg9snwv.png)

For example, Vue has a 1000 line creation time of 42 seconds, while Svelte has 48.4 seconds (at the time of writing). Well, it's clear that there is no comparison in terms of functionality :)

https://github.com/Camplejs/Cample.js
Model business logic in Prolog
Tags: prolog, business, programming, tutorial
Published: 2023-07-01 14:42:06

Prolog is a logic programming language that offers a concise approach to modeling systems with minimal lines of code. This has benefits that extend beyond engineers. Non-engineering professionals, such as sales teams, can leverage Prolog's modeling capabilities to understand and navigate complex systems.

Assume that you are going to design customers' discount rules. You first come up with a customer should possess a member's card to be eligible for discounts and your boss has specified that each customer should receive the discount only once.

You model the rules in Prolog.
```prolog
have_discount(X) :- have_members_card(X, yes), discount_received(X, no).
```

If your first customer, Tom, has member's card and hasn't received discounts ever, you can express it in Prolog,
```prolog
have_discount(X) :- have_members_card(X, yes), discount_received(X, no).

have_members_card(tom, yes).
discount_received(tom, no).
```

Try to run it in your console.
```
swipl business_logic.pl
?- have_discount(tom).
true.
```

You finished the first rule implementation in Prolog.

If you need the rule to be expressed as natural sentences, ChatGPT helps you much.

You
```
have_discount(X) :- have_members_card(X, yes), discount_received(X, no).

Please translate the rule into English sentences.
```

ChatGPT
```
The rule "have_discount(X) :- have_members_card(X, yes), discount_received(X, no)" can be translated into English as follows:

"If a person (represented by 'X') has a membership card and has not yet received a discount, then they have a discount."
```

Hope you have a great time working with the Prolog programming language!
Counting the coins
Tags: perl, python, theweeklychallenge
Published: 2023-07-01 11:48:21

## Weekly Challenge 223

Each week Mohammad  S. Anwar sends out [The Weekly Challenge](https://theweeklychallenge.org/), a chance for all of us to come up with solutions to two weekly tasks. My solutions are written in Python first, and then converted to Perl. It's a great way for us all to practice some coding.

[Challenge](https://theweeklychallenge.org/blog/perl-weekly-challenge-223/), [My solutions](https://github.com/manwar/perlweeklychallenge-club/tree/master/challenge-223/sgreen)

## Task 1: Count Primes

### Task

You are given a positive integer, `$n`.

Write a script to find the total count of primes less than or equal to the given integer.

### My solution

This is nearly an identical task as the [second task](https://theweeklychallenge.org/blog/perl-weekly-challenge-198/#TASK2) from challenge 198. The only difference is that challenge was to count values less than `$n`, while this one is less than or equal to that value.

Therefore I copy and pasted that code, and changed the counter to include the supplied number.

### Examples

```bash
$ ./ch-1.py 10
4

$ ./ch-1.py 1
0

$ ./ch-1.py 20
8
```

## Task 2: Box Coins

### Task

You are given an array representing box coins, @box.

Write a script to collect the maximum coins until you took out all boxes. If we pick box[i] then we collect the coins `$box[i-1] * $box[i] * $box[i+1]`. If `$box[i+1]` or `$box[i-1]` is out of bound then treat it as 1 coin.

### My solution

For this challenge, I have a recursive function called `collect_coins`. It takes a list (array in Perl) of `coins`. If there is only one coin remaining, I return that.

If there is more than one coin, I loop through the positions from 0 to one less than the number of coins, using the variable `i`. For each iteration I calculate the number of coins

```python
        collect = coins[i]
        if i > 0:
            collect *= coins[i-1]
        if i < remaining_coins - 1:
            collect *= coins[i+1]
```

and call the function again with that coin removed.

```python
        new_coins = coins.copy()
        del new_coins[i]
        collect += collect_coins(new_coins)
```

I then record this score in the collections list. The function returns the maximum collections score.

### Examples

```bash
$ ./ch-2.py 3 1 5 8
167

$ ./ch-2.py 1 5
10
```
How to save list on S3 using lambda function and boto3
Tags: s3, aws, lambda, python
Published: 2023-07-01 14:36:23

If you want to save a list on Amazon S3 using a Lambda function and Boto3, you can follow these steps:

1 First, you need to create a new Lambda function in the AWS Console. Choose the Python runtime and give it an appropriate name.
2 In the Lambda function code, you will need to import the Boto3 library by adding the following code at the beginning of your function:

```
import boto3

```

3 Next, you need to create a connection to S3 using the Boto3 client. To do this, add the following code to your function:

```
s3_client = boto3.client('s3', 'eu-central-1')

```

4 Now you can use the `put_object` method to save your list to S3. For example, if your list is called `my_list` and you want to save it to a bucket named `bucket_name` and a file named `my_list.txt`, you can use the following code:

```
s3_client.put_object(Bucket='bucket_name', Key='my_list.txt', Body=str(my_list))

```

5 Finally, save your Lambda function and test it by invoking it. You should now see your list saved to S3 in the specified bucket and file name.

**Full code:**

```
import json
import boto3

def lambda_handler(event, context):
    
    bucket_name = "save-data-from-lambda"
    list001 = ['this', 'is', 'first', 'list']

    s3_client = boto3.client('s3', 'eu-central-1')
    # save to s3
    save_to_s3 = s3_client.put_object(
        Bucket=bucket_name, 
        Key='my_list.txt', 
        Body=str(list001)
    )

```


![AWS Lambda Function](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ce1907h0jftxquxjg3a3.png)

That's it! You now know how to save a list to S3 using a Lambda function and Boto3.

I also prepared a video in which you will learn more details. You will learn how to save and read files from S3 bucket:
{% embed https://www.youtube.com/watch?v=zIm-B33ChIk %}

If you are interested, I also encourage you to visit my blog where you will find the code that you can easily copy and adapt to your needs:
[https://lepczynski.it/en/aws_en/how-to-read-and-write-a-file-on-s3-using-lambda-function-and-boto3/](https://lepczynski.it/en/aws_en/how-to-read-and-write-a-file-on-s3-using-lambda-function-and-boto3/)
Full Python Tutorial in practice
Tags: python, programming, web, webdev
Published: 2023-07-01 14:27:20


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/db2xlbr3dz25dzczcvwr.png)

I working with other languages, but i'am away learning new languages, and I thing that te best wayis to know the oficial documentation.

And that's what did.

I madet this repository following all official python tutorial from python.org

**Let's to pratice!**

[python fom a-z](https://github.com/leandroayala/python_a_z)
Supercharge your Coding Potential with Codehub
Tags: webdev, javascript, programming, beginners
Published: 2023-07-01 14:00:00

Embarking on a coding journey can be a daunting task, but with Codehub, you can unlock your inner coding maestro and conquer the digital realm. Codehub is a mobile code learning platform that offers custom lessons, valuable AI insights, and individualized support to help programming enthusiasts, students, and professional developers reach new heights in their coding abilities.

**[JUMP STRAIGHT TO THE JUICE - LINK
](https://www.aiforme.wiki/ai/tools/codehub%20ai)**

Custom Lessons and Valuable AI Insights:
[Codehub](https://www.aiforme.wiki/ai/tools/codehub%20ai) empowers users with custom lessons tailored to their coding goals. Whether you're a beginner or looking to expand your skills, Codehub offers curated content and valuable AI insights to help you progress and overcome coding obstacles. With Codehub's guidance, you can enhance your abilities and unlock your coding potential.

Comprehensive Coding Challenges:
Codehub provides hundreds of coding challenges across various programming languages. With a focus on Python and plans to expand to ten programming languages, Codehub offers a diverse range of challenges to practice and sharpen your coding skills. These challenges are designed to be beginner-friendly, ensuring that users with little or no coding experience can participate and gain confidence.

Interactive Learning Experience:
Codehub offers a mobile app that provides an immersive and interactive learning experience. Through short, bit-sized coding challenges and quizzes, users can practice and apply their coding knowledge in a hands-on manner. The app's user-friendly interface and intuitive design make it easy to navigate and engage with the coding exercises.

Community Support:
Joining Codehub means becoming part of a vibrant coding community. Users have access to community support, where they can connect with fellow learners, ask questions, and seek guidance. This collaborative environment fosters knowledge sharing, encourages discussion, and provides a network of support to aid in your coding journey.

Premium Access and Discount Offer:
Codehub offers a Premium access option, which provides additional features and benefits to enhance your learning experience. As a special offer, applying the code "CODECAT" grants users a 3-month discount on Premium access. This enables you to access exclusive content and take full advantage of the platform's resources.

Conclusion:
Codehub is your gateway to mastering the art of coding. With its mobile code learning platform, custom lessons, valuable AI insights, and a supportive community, Codehub empowers users of all levels to excel in their coding abilities. Join Codehub today and embark on an inspiring coding journey.

**[JUMP STRAIGHT TO THE JUICE - LINK
](https://www.aiforme.wiki/ai/tools/codehub%20ai)**
How to use SOAP/WSDL APIs using SoapUI & Python Zeep
Tags: python, soap, wsdl, api
Published: 2023-07-01 13:13:18

In our Agile / Mobile / "moderm" and fron/back life, we see lots of REST APIs. Using REST is straight forward if you know your HTTP, GET, Post, ... 
But on the enterprise level, you will start seein SOAP and WSDL based APIs which look more confusing. Why? Because they are designed machines in mind and sometimes WSDL file is seen as the *documentation* and you wont get a human readable doc!
No worries... WSDL has whatever you need to work with your APIs. In this Post I'll show you how! Using SoapUI and the Zeep python library.

{% embed https://www.youtube.com/watch?v=nFzwf-r2fJU %}
Automate your smart contract Easily
Tags: smartcontract, web3, blockchain, ethereum
Published: 2023-07-01 13:09:38

I have found a amazing way to automate your smart contract Easily without using Chainlink

just follow my steps 👇

Basically , I wanted to burn my ERC20 token in every 20 days automatically without any human effort so after researching I found that using chainlink we can perform the automation but it is not that easy

but luckily , I found a amazing website ( gelato ops ) which can help me to automate the burning process from my smart contract easily

Let me explain you about the process :

> First you will need smart contract deployed in any chain such as Ethereum , polygon etc

> Second, Go to gelato ops website connect your MetaMask and create a Task

> You need to paste your deployed smart contract address and Abi

> Then choose the function you want to automate from your smart contract

> Next, select the time interval you want to execute your smart contract function and if you take my example then I want to burn my erc20 token in every 20 days

> After that , you need to select payment where enough funds should be present to pay the gas fees for executing the automation

> Finally , give a name to your automation task and pay the gas fees to start the task


That's it , you have automated your smart contract function successfully

so try it out today, all the best
What you learning about this weekend?
Tags: codenewbie, discuss, learning, beginners
Published: 2023-07-01 13:00:00

Hey folks 👋

What y'all learning about this weekend?

Whether you're sharpening your [JS](https://dev.to/t/javascript) skills, making PRs to [your OSS repo of choice](https://github.com/forem/forem) 😉, sprucing up your portfolio, or [writing a new post](https://dev.to/new) here on DEV, we'd like to hear about it.

Learn at your own pace!

![2 cartoons racing neck & neck while reading books at the same time.](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/jfoahbhg3evcpjozmb4z.gif)
CAP in System design
Published: 2023-07-01 12:59:20

What is the CAP theorem and why it is relevant in system design?CAP stands for consistency, Availability and Partitional tolerance.

Consistency: Whenever we write any data in DB it should follow the ACID properties and it should be consistent across all the users, e.g. If I am placing a coffee order and making changes to the order and I am going to customer support for an issue customer support should able to see my updated order in his dashboard.

Availability: In distributed computing, we have multiple nodes which are serving a user request. In case of any downtime still, your system should be able to serve the

user request without any error and fresh data.

Partition tolerance: In a distributed system if there is a network failure and some nodes are down or delay in communication among nodes. It allows the system to continue functioning and able to server the user request
From Fragile Dependencies to Stable Foundations: Mastering the Dependency Inversion Principle
Tags: php, solid, dependencyinversionprinciple, phpdevelopers
Published: 2023-07-01 12:00:15

---
title: From Fragile Dependencies to Stable Foundations: Mastering the Dependency Inversion Principle
published: true
description: Explore the benefits of implementing the Dependency Inversion Principle for robust and maintainable code

tags: php, solid, DependencyInversionPrinciple, phpDevelopers
cover_image: https://anastasionico.uk/img/blog/mastering-the-dependency-inversion-principle.jpg
---

Let me take you back to my days at a company that rented out and sold commercial vehicles.

 

As a junior web developer, I faced a massive challenge.

Managing a tangled mess of dependencies in our monolithic codebase. It was like wandering through a maze with no end in sight.

But then, on a random weekend, while reading a book in the park, I discovered the Dependency Inversion Principle, and everything changed. 

 

Picture this: I was battling daily with the codebase, struggling to make even the tiniest changes without causing a chain reaction of errors.

It was frustrating and time-consuming.

 

But when I stumbled upon the Dependency Inversion Principle, it was like finding a hidden treasure. 

 

I set out on a mission to refactor our legacy code, untangling the web of dependencies.

And guess what? It worked wonders! The codebase became more manageable, flexible, and scalable.

 

Bugs were no longer unbeatable enemies, and new features seamlessly fit into place. 

Now, I know you might be facing a similar challenge in your programming journey.

 

That's why I'm excited to share this blog post with you.

It's all about the Dependency Inversion Principle.

 

The secret to transforming your coding experience. Let's dive in and conquer those dependencies together!

[From Fragile Dependencies to Stable Foundations: Mastering the Dependency Inversion Principle
](https://anastasionico.uk/blog/mastering-the-dependency-inversion-principle)