teleren/devto huggingface dataset:
HashMap In Java
Tags: java, training, courses, certification
Published: 2023-12-01 10:09:27

In Java, **[HashMap ](https://www.youtube.com/watch?v=E0-c7H5VNp0)**is a part of the Java Collections Framework and is used to store key-value pairs. It is implemented as a hash table, providing constant-time performance for basic operations (like get and put) in the average case.

Here are some key points about HashMap in Java:

Key-Value Pairs:

Each element in a HashMap is a key-value pair.
Keys must be unique within a HashMap.
Values can be duplicated.
Null Keys and Values:

HashMap allows one null key and multiple null values.
Performance:

HashMap provides constant-time performance for the basic operations (get and put) on average.
However, the actual performance may degrade in case of hash collisions.
Ordering:

The order of elements in a HashMap is not guaranteed. If you need a specific order, consider using LinkedHashMap.
Methods:

put(K key, V value): Adds a key-value pair to the map.
get(Object key): Retrieves the value associated with the specified key.
remove(Object key): Removes the key-value pair associated with the specified key.
containsKey(Object key): Returns true if the map contains the specified key.
containsValue(Object value): Returns true if the map contains the specified value.
"Embarking on a Coding Odyssey: From Passion to Projects and Beyond!"
Published: 2023-12-01 08:08:35

Hello everyone, I'm Hansen. This year marks my first year diving into development, and you can call me Hansen. Towards the end of last year, I had my first encounter with programming and instantly fell in love with it. The fascinating interfaces and the myriad of functionalities satisfied my curiosity, prompting me to decide to learn a programming language this year to bring my ideas to life. One of these ideas involves creating a project to store the everyday moments and travel photos with my girlfriend.

At the beginning of my programming journey, I faced numerous challenges, such as not knowing where to start, lacking a structured learning plan, and feeling like a headless fly bumping around. Fortunately, with guidance from an experienced mentor, I found the right path. He suggested learning based on the projects I wanted to work on, emphasizing that it keeps the interest alive. After sharing my aspirations, he recommended starting with PHP, as it's relatively simple, yields quick results, and can maintain enthusiasm for learning.

So, I followed his suggested learning approach, step by step – learning, practicing, learning again, and practicing more. Eventually, I persevered, and as of now, the basic UI and functionalities are in place; the next step is to refine them. Although my account is a bit brief, I want to convey that when learning new things, it's beneficial to try hands-on development, diving directly into creating features while simultaneously consulting resources. This approach helps in building confidence.

In the future, I'll also be learning JavaScript, aiming to become a full-stack engineer. If you're also on a learning journey, feel free to join in the conversation!
Why you should ditch NPM UUID. Node has you covered!
Tags: node, performance, javascript, uuid
Published: 2023-12-01 10:03:39

_In this post, you will see the reason why you shouldn't use anymore the `uuid` NPM package anymore for generating Universally Unique Identifiers._

If you have worked income important backend NodeJS applications, you are probably familiar with the [`uuid`](https://www.npmjs.com/package/uuid) package. However, there is a less common, but core Node module called `crypto`, available since NodeJS v14.17.

According to my benchmark, the core module [`randomUUID()`](https://nodejs.org/api/crypto.html#cryptorandomuuidoptions) from `node:crypto` performs better and quicker in terms of speed and reliability. Additionally, it is natively accessible in Node.js since v14.17 without the necessity of installing a 3rd-party package like `uuid`.

![Benchmark UUID VS Crypto RandomUUID](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/kjaflk1olzmaoffh04ny.png)


Note: My benchmark was run with Node v18.18.1

```javascript
// Run: node benchmark-uuid-vs-core-crypto.js

// native randomUUID crypto benchmark
const { randomUUID } = require("crypto");

console.time("crypto.randomUUID()");
for (let time = 0; time < 10_000_000; time++) {
  randomUUID();
}

console.timeEnd("crypto.randomUUID()");

// uuid package benchmark
const { v4 } = require("uuid");
console.time("uuid.v4()");
for (let time = 0; time < 10_000_000; time++) {
  v4();
}
console.timeEnd("uuid.v4()");

// note, I've used 10_000_000 with _ which are numeric separators
// https://github.com/pH-7/GoodJsCode#-clearreadable-numbers
```
79KING
Published: 2023-12-01 09:52:19

Nhà cái 79king cung cấp dịch vụ giải trí cá cược như : game bài đổi thưởng , bắn cá , quay hũ , cá độ bóng đá , ... Ưu đãi đăng ký 79king nhận ngay 100k trải nghiệm thả ga. 
Name: 79king
Website: https://79king.wtf/
Địa chỉ: 1332 Phạm Văn Thuận, Khóm 3, Thành phố Biên Hòa, Đồng Nai, Việt Nam
Điện thoại: 0978812346
Email: 79king.wtf@gmail.com
https://79king.wtf/dang-ky-79king/
https://79king.wtf/dang-nhap-79king/
https://79king.wtf/tai-app-79king/
https://79king.wtf/rut-tien-79king/
https://79king.wtf/khuyen-mai-79king/
https://79king.wtf/gioi-thieu-79king/
https://79king.wtf/cham-soc-khach-hang-79king/
#79kingwtf #79king #nhacai79king #79kingcasino
https://twitter.com/79kingwtf
https://vimeo.com/79kingwtf
https://www.pinterest.com/79kingwtf/
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https://www.youtube.com/@79kingwtf
https://www.flickr.com/people/199607419@N05/
Thủ tục kết hôn với người Slovakia Khó Không?
Published: 2023-12-01 09:35:15


Quá trình làm[ thủ tục kết hôn người Slovakia Anzlaw ](https://anzlaw.net/thu-tuc-ket-hon-voi-nguoi-slovakia/
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/qwocjkl8asvvg92zjzvh.jpg))thường được đánh giá là phức tạp, đặc biệt là khi cần tìm kiếm thông tin và chuẩn bị giấy tờ. Khó khăn càng gia tăng nếu địa phương cư trú của bạn chưa có kinh nghiệm giải quyết đăng ký kết hôn, đôi khi đối mặt với thách thức từ cán bộ và công chức. Họ có thể gặp khó khăn trong việc xử lý hồ sơ và thậm chí từ chối với lý do chưa có kinh nghiệm giải quyết, làm kéo dài thời gian hoặc gặp ngần ngại trong việc tiếp nhận hồ sơ.

Để giải quyết vấn đề này, nhiều cặp đôi kết hôn với người Slovakia đã lựa chọn tìm đến các đơn vị uy tín để nhận trợ giúp. Sự hỗ trợ từ những đơn vị này đặc biệt quan trọng đối với những người không quen với quy trình đăng ký kết hôn, giúp họ tránh được những phiền toái và sai sót trong quá trình chuẩn bị hồ sơ.

Chúng tôi hiểu rằng quá trình này có thể đầy thách thức, và chúng tôi mong muốn đồng hành và hỗ trợ bạn trong việc thực hiện thủ tục kết hôn với người Slovakia tại Việt Nam. Đội ngũ của chúng tôi cam kết cung cấp thông tin chính xác và hỗ trợ đầy đủ để giúp quá trình này diễn ra một cách thuận lợi nhất.
DBMS Architecture: Unveiling the Layers of Database Mastery!
Published: 2023-12-01 09:31:11

Hey,

Recently, I came across an insightful article on DBMS architecture that truly demystified some of the intricate aspects of managing databases. If you haven't had the chance to explore it yet, you can find the article here: [Architecture of DBMS](https://www.interviewbit.com/blog/dbms-architecture/).

The article delves into various layers of database management systems, discussing concepts like the database engine, query optimization, and transaction management. It's a must-read for anyone keen on mastering the art of database architecture.

Points of Discussion:

Database Engine Insights: The article introduces the concept of the database engine. I'd love to hear your experiences with different database engines and any notable pros and cons you've encountered.

Query Optimization Techniques: Optimizing queries is often a challenging task. What are your go-to techniques for query optimization, and have you come across any interesting case studies or real-world challenges in this area?

Transaction Management Best Practices: Transaction management is crucial for maintaining data integrity. What are some best practices you follow to ensure seamless and reliable transaction management in your database systems?

Scalability Considerations: As databases grow, scalability becomes a vital concern. How do you approach scalability in DBMS architecture, and are there specific strategies you've found effective?

Feel free to share your thoughts, ask questions, or provide additional resources that have been instrumental in your journey to mastering DBMS architecture.
Best Astrologer in India - Giri Raj Shastri
Tags: astrologer, india
Published: 2023-12-01 09:28:57

We would like you to meet with Astrologer Giri Raj Shastri he is one of the most ideal and contacted astrologers in this field of astrology and also worldwide due to which people from all across the world confide in him in order to solve the respected problem of their life. So, if you are also one of those who are having issues in your life but, there is nowhere you can turn in then you should definitely contact Astrologer Giri Raj Shastri because he is not just well known as the Best Astrologer in India but, he is also well known as follows –
1.	Black Magic Specialist in Australia
2.	Black Magic Specialist in USA
3.	Black Magic Specialist in Canada
4.	Black Magic Specialist in UK
5.	Love Marriage Specialist in Australia
6.	Love Marriage Specialist in USA
7.	Love Marriage Specialist in Canada
8.	Love Marriage Specialist in UK
So, now we all know that Astrologer Giri Raj Shastri is well known by which another name in this society but basically, we all know that in this timeline most of the people are being engaged in different kinds love relationship issues due which he is providing his love problem solution service all across the globe but, place where he gets the greatest response are provided below –
1.	Love Problem Solution in Canada
2.	Love Problem Solution in Australia
3.	Love Problem Solution in USA
4.	Love Problem Solution in UK
So, these were different kinds of details regarding his service and his name and fame all across the globe. But if someday there is such a situation in which you are in need of his contact details then those details are being provided below –
(M) +91 - 9958718394
(E):  Girirajshastri1@gmail.com
(W): https://www.bestindianstrologer.com/
Supercharge Your WordPress Contact Forms: Guide to Integrating Contact Form 7 with SendFox
Tags: wordpress, contactform
Published: 2023-12-01 09:24:37


Are you tired of the same old contact form routine on your WordPress site? Well, buckle up because we're about to revolutionize your user engagement. In this blog post, we're diving into the dynamic duo of Contact Form 7 and SendFox, unleashing a powerhouse combination that will not only streamline your communication but also elevate your email marketing game.
Why settle for ordinary when you can integrate extraordinary?

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/l28r53mirjxnnlp3i9vz.jpg)

**Unleashing the Potential**: Learn how to seamlessly integrate **[Contact Form 7 with SendFox](https://www.contactformtoapi.com/)** to effortlessly capture and manage user inquiries. Say goodbye to missed opportunities and hello to a streamlined communication flow!

 **Elevate Your Email Marketing**: Discover the magic that happens when your contact forms and email marketing work in perfect harmony. With SendFox, turn casual inquiries into engaged subscribers and watch your email campaigns soar.

**Step-by-Step Guide**: No tech overwhelm here! We'll guide you through the integration process with easy-to-follow steps and screenshots. Whether you're a WordPress pro or a beginner, you'll master this integration in no time.
But wait, there's more

**Boost Conversions**: Explore advanced tips on crafting irresistible contact forms that not only gather information but also encourage conversions. It's not just about data; it's about making every interaction count.

 **Privacy Matters**: We'll address your concerns about data privacy and security. Rest easy knowing that your user information is handled with the utmost care, maintaining trust and compliance.

**Bonus Tips and Tricks**: Unlock secret features and hidden gems within Contact Form 7 and SendFox. From personalized autoresponders to segmenting your audience, we've got the insider tips to supercharge your strategy.

**Ready to Elevate Your WordPress Game?**
Say goodbye to mundane contact forms and hello to a new era of user engagement and email marketing synergy. Our guide will empower you to transform every interaction into an opportunity, creating a lasting impact on your audience.

Ready to skyrocket your WordPress website's potential? Dive into the ultimate integration guide now and unleash the true power of Contact Form 7 and SendFox
Remember, it's not just about forms; it's about forging connections and turning every inquiry into a stepping stone for success. Let's revolutionize your WordPress experience together!
Building a Simple TCP Port Scanner in Go
Tags: go, networking, programming
Published: 2023-12-01 09:24:34

Hey! 🚀

I'm excited to share a simple yet powerful tool I've built using Go - a TCP port scanner. This tool allows you to quickly identify open ports on a target server, making it a handy utility for network administrators and security enthusiasts. Let's dive into the code and explore how it works!

https://github.com/ThanhPhucHuynh/tcp-scanner-go-basic/tree/main

```Go
func worker(ports, results chan int) {
	for p := range ports {
		address := fmt.Sprintf("scanme.nmap.org:%d", p)
		conn, err := net.Dial("tcp", address)
		if err != nil {
			results <- 0
			continue
		}
		conn.Close()
		results <- p
	}
}
```
And call this func in main

```Go
ports := make(chan int, MAX_PORTS)
results := make(chan int)
var open_ports []int

for i := 0; i < cap(ports); i++ {
	go worker(ports, results)
}

go func() {
	for i := 1; i <= MAX_PORTS; i++ {
		ports <- i
	}
}()

for i := 0; i < MAX_PORTS; i++ {
	port := <-results
	if port != 0 {
		open_ports = append(open_ports, port)
	}
}
```

## Understanding the Code
First, let's break down the key components of the code:

Goroutines and Channels: The use of goroutines and channels in Go is central to the concurrent execution of tasks. Goroutines are lightweight threads, and channels facilitate communication between them.

worker() Function: This function is responsible for attempting to establish a TCP connection to a given port on the target server. If the connection is successful, the port is considered open, and its number is sent through the results channel.

main() Function: The main function sets up the necessary channels and goroutines, distributing the task of scanning ports among the workers. It then collects the results, filters out closed ports, and finally, prints the open ports in ascending order.

Running the Scanner
To run the port scanner, simply copy the code into a Go file (e.g., main.go) and execute it. The scanner defaults to scanning the well-known ports (1-65535) on the target server scanme.nmap.org. You can customize the target address by modifying the address variable in the worker() function.

```bash
go run main.go
```

## Result

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/23gcet5dlc38qalis5qn.png)

## How It Works
The scanner utilizes the net.Dial function to attempt a TCP connection to each port. If the connection is successful, the port is considered open, and its number is added to the list of open_ports. The final list is then sorted and printed.

## Conclusion
This simple TCP port scanner in Go demonstrates the language's concurrency capabilities. It's a great starting point for those looking to explore network programming or enhance their Go skills. Feel free to experiment, modify, and extend the code to suit your specific needs!

I hope you find this tool useful in your network exploration endeavors. Happy coding!
The Woovi Challenge
Tags: beginners, learning, webdev
Published: 2023-12-01 09:05:02

Perhaps you've already come across this [gist](https://gist.github.com/sibelius/b1a10021b83165a72de8b31e7b9d58c5) about the Woovi Challenge. If you've found it challenging to understand what these tasks involve, don't worry—it's not as complicated as it may seem. Essentially, the objective is to create a CRUD API using GraphQL and then implement it with React + Relay.

**Let me provide you with a quick explanation.**

[CRUD](https://dev.to/anaflatlogic/what-is-crud-how-to-create-a-crud-app-746): Create, Read, Update, and Delete.
[GRAPHQL](https://graphql.org/learn/): An alternative model to REST api with graphs.
[REACT](https://pt-br.legacy.reactjs.org/): The most famous JavaScript framework for the frontend.
[RELAY](https://relay.dev/docs/): A data management lib to assist you on frontend.

Well, this covers everything you need to tackle the challenge. But what should you do? The answer is with you. In this challenge, you are free to build anything you want, but being creative in solving problems or creating products matters.

**Now that you know what the challenge is, let me explain what I'll do in my challenge:**

For my challenge, I'll be building an entire e-commerce app. Not a mock-up e-commerce, but a genuine app that will go into production to assist a friend with a small business. I'm aiming for an MVP for his e-commerce. Although he already has clients, we're working on creating a real-world solution here.
Giới thiệu về Caready.vn - Sàn mua bán ô tô tại Việt Nam
Tags: cars, beginners, webdev, vietnam
Published: 2023-12-01 09:02:49

Chào mọi người, chúng tôi là Caready VN. 

Được thành lập vào năm 2021, Caready là sàn thương mại điện tử mua bán ô tô cung cấp dịch vụ mua xe trực tuyến, đăng tin bán xe dễ dàng, kết nối người mua và người bán chuyên nghiệp và đáng tin cậy.

Hãy kết nối với chúng tôi để trải nghiệm những dịch vụ hiện đại và ưu đãi mới nhất từ Caready - Sàn mua bán ô tô uy tín hàng đầu Việt Nam:

1/ Linked In: [https://lnkd.in/eB3ZhpYd]
2/ Facebook: https://www.facebook.com/CareadyOfficial
3/ Website: https://caready.vn/
4/ Instagram: https://www.instagram.com/careadysocial/
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/togyep62720imzc5yw1k.png)
5/ X: https://twitter.com/CareadyVn
6/ Wattpad: https://www.wattpad.com/user/CareadyVN
7/ Wordpress: https://wordpress.com/home/careadydotvn.wordpress.com 8/ Blogger: https://careadysocial.blogspot.com/
9/ Reddit: https://www.reddit.com/user/Careadyvn123
10/ Linktree: https://linktr.ee/careadyvn
Hoisting
Published: 2023-12-01 08:53:59


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/8igst9e6pys2obnwbeq3.png)

https://www.freecodecamp.org/news/what-is-hoisting-in-javascript/

Variable hoisting with var

```
console.log(foo); // undefined

var foo = 'bar';

console.log(foo); // "bar"
```

Using an undeclared variable before its assignment will also throw a ReferenceError because no declaration was hoisted:

```
console.log(foo); // Uncaught ReferenceError: foo is not defined
foo = 'foo';      // Assigning a variable that's not declared is valid
```

Variable hoisting with let and const

```
console.log(foo); // Uncaught ReferenceError: Cannot access 'foo' before initialization

let foo = 'bar';  // Same behavior for variables declared with const
```

**_The temporal dead zone_**
The reason that we get a reference error when we try to access a let or const variable before its declaration is because of the temporal dead zone (TDZ).

The TDZ starts at the beginning of the variable's enclosing scope and ends when it is declared. Accessing the variable in this TDZ throws a ReferenceError.

Here's an example with an explicit block that shows the start and end of foo's TDZ:

```
function foobar(foo = bar, bar = 'bar') {
  console.log(foo);
}
foobar(); // Uncaught ReferenceError: Cannot access 'bar' before initialization
```

However, this isn't the case when using a var variable before declaration because it is initialized with undefined when it is hoisted:

```
console.log(typeof foo); // "undefined"
var foo = 'foo';
```

Function hoisting in JavaScript
Function declarations are hoisted, too. Function hoisting allows us to call a function before it is defined. For example, the following code runs successfully and outputs "foo":

```
foo(); // "foo"

function foo() {
	console.log('foo');
}

```

Example ->

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/yk8uxe08bn26ktw5laqf.png)


In this only calling the function by addArrow() doesn't call the function with params and so prints undefined
but if called like addArrow(2,3) -> gives typeError coz var was expecting a variable declaration whereas we are expecting function.

Problem of Hoisting with var ->


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/z6tsipgm9ht16gvhqqym.png)

what happened was because of the falsy(undefined) value of var while hoisting a condition is being met which shdn't be which brings us to a bug to be taken care of when we code.
How to make FREE Website in 2023 - 2024
Tags: webdev, html, website, javascript
Published: 2023-12-01 08:46:01

I know many of you must have wished to make your own personal website atleast ones in your life!
In this blog I will share you the method that I used to make my personal [Website](https://prakhar-doneria.neocities.org/) with ₹0 investment , without using PC 💻 and 0 Coding knowledge (it's good if you can code 😅).

## 1. <u>SET UP</u>

We will use our Mobile (Android) to make a basic but cool ui web page.

####• First and most important is to download a Code Editor 
For this I strongly recommend you to download [HTML Editor PRO](https://com-protecgames-htmleditor.en.uptodown.com/android) it's FREE and is available on [Uptodown](https://com-protecgames-htmleditor.en.uptodown.com/android) and Galaxy Store with a great number of features and good rating.

####• Second is choosing a free host

Their are many free host like 
[Neocities](https://neocities.org/), [000WebHost](https://in.000webhost.com/), [GitHub Pages](https://github.com/)

For now I will go with Neocities. As its quick and easy to begin.

####• Third is Coding

I think you must have downloaded [HTML Editor PRO](https://com-protecgames-htmleditor.en.uptodown.com/android) till now, if you did not then press the home tab and download it.

» Now make a new project say, index.html
» Go back to Settings > Developer Tools > Enter your OpenAI API key and save it
» Reopen your project
» Tap on the top most <b> ROBOT </b> icon
» It would show a prompt like

> Write a program to (Enter your prompt) in HTML

» Inside the bracket write what things you want for your website (HERE IS AN EXAMPLE OF MY PROMPT I USED FOR MY SITE)

> Write a program to make a portfolio website for me a software developer also add a iOS style toggle button for dark mode and add a fab as Message to open email use font as jet brains mono

» Now simply re-tap the ROBOT icon

» It will write a code for your within 1 minutes

## • Deploying Website

Open neocities and sign in to dashboard now either upload your HTML file from your device location or copy the code from app and paste it.

Click on Save in Neocities


Hurray 🙌🏻 Your site is deployed 👏🏻 do share your project link in comment.


The best point of HTML Editor PRO is you can inspect any website using built-in tool and if you are on the latest version of HTML Editor PRO you can upload your images in app cloud to use in your project. It's all Free.