teleren/devto huggingface dataset:
Introduction to Algorithms
Tags: algorithms, programming, computerscience, codenewbie
Published: 2023-02-03 15:42:51

**What is an Algorithm?**

These are a set of instructions for completing a task. Can also be defined as a set of steps a program takes to complete a task.

It is important for developers to know when and why they should use a certain algorithm by understanding the problem and breaking it down into steps. This is called Algorithmic Thinking.

An algorithm must contain a specific set of instructions in a particular order:

1. Start from the beginning.
2. Compare the current value to the target value.
3. Move sequentially.
4. Reach the end of the list.
5. Each step in an algorithm needs to be explicitly clear and not have substeps.

An algorithm should have _correctness_ and _efficiency_

**_Correctness_** is when an algorithm takes in an input and gives an output without taking an infinite amount of time.
Efficiency. This can be broken down into two; 

- _Time Complexity_: This is the amount of time taken to complete a task
- _Space complexity_: This is the amount of memory taken by the computer

**What exactly is Time Complexity?**


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/zu0wprz9qlfmdxjwzyco.png)

I’ll explain using the Big O notation.

**_What is the Big  O?_**

Big O notation is a mathematical notation used to describe the time complexity of algorithms. In other words, It calculates the time taken to run an algorithm as the input grows.

Reading the runtime of a _**Linea Search**_ is O(n), which can be read as Constant Time. This means that no matter where we are on the search we take the same amount of time to compare a number to the target number

The runtime of **_Binary Search_** is written as O(log n). This is known as the logarithm time/sublime. Example: Log₂ 8 = 3; this means that to get to 8 on a binary search we will need three tries (2^3=8).

**_Quadratic Runtime._** This is presented as O(n²). This is an operation raised to the power of two.
**_Cubic Runtime._** This is a runtime raised to the power of three; n^3.
**_Polynomial Runtime_** is all the runtime where we look at the worst-case scenario, O(n^k).
_**Exponential algorithm:**_ These are expensive methods/algorithms presented as O(xⁿ). These are algorithms that are inefficient because one change causes a significant change in the output. Such methods include:

- Brute Force
- Travelling Salesman
What is react-testing-library and what is it used for?
Tags: react, testing, javascript, ai
Published: 2023-02-03 15:36:25

---
title: What is react-testing-library and what is it used for?
published: true
description: This post was generated by artificial intelligence and we will see what is react-testing-library? and why use it?
tags: react, testing, javascript, ai
# cover_image: https://direct_url_to_image.jpg
# Use a ratio of 100:42 for best results.
# published_at: 2023-02-03 15:27 +0000
---

# What is react-testing-library and what is it used for?
react-testing-library is a testing library for React applications that focuses on testing the end-user experience rather than testing the internal logic of components. This library is easy to use and integrates seamlessly with React, making it ideal for testing React applications.

## Why use react-testing-library instead of other testing libraries?

React-testing-library focuses on testing the application from the end user's perspective. This means that instead of focusing on testing individual components in isolation, it tests how the application behaves in its final form, including the interaction with the components.

In addition, react-testing-library uses a "real-user-like" approach to its testing, which means that tests are performed with the same movements and actions that a real user would perform in the application. This makes the tests more accurate and ensures that the application behaves as expected in real situations.

## How to use react-testing-library?

To use react-testing-library in your tests, you must first install the library via npm or yarn:

```bash
npm install --save-dev react-testing-library
```

Once installed, you can write your tests using the API provided by react-testing-library. For example, to test a React component, you must first import the component and the library:

```jsx
import React from 'react';
import { render, fireEvent } from 'react-testing-library';
import Button from './Button';
```

Then, you can use the render function to render the component in a test environment and perform your tests:

```jsx
test('Button component', () => {
  const onClick = jest.fn();
  const { getByText } = render(<Button onClick={onClick}>Click me</Button>);
  const button = getByText('Click me');
  
  fireEvent.click(button);
  
  expect(onClick).toHaveBeenCalled();
});
```

In this example, the `render` function is used to render the Button component in a test environment. Then, the `getByText` function is used to get the button and the `fireEvent.click` function is used to simulate a click on the button. Finally, the onClick function is verified to have been called with `expect(onClick).toHaveBeenCalled()`.

## Conclusion

`react-testing-library` is a testing library for React applications that allows you to test the end-user experience effectively. It is easy to use and integrates seamlessly with React, making it ideal for testing React applications.
Squirrel!
Tags: github, git, codereview, codequality
Published: 2023-02-03 15:28:47

Code reviews are the most-interrupted part of the dev process.
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/widlaptnavb0a0cxaxj6.png)

https://twitter.com/EricMeadowsDev
Mailchimp Import and Export Contacts
Tags: wordpress, webdev, mysql, programming
Published: 2023-02-03 15:23:03

Want to create your own website with WordPress? Here's a step-by-step guide on how to install WordPress with MySQL!

1. Choose a web hosting service and sign up.
2. Create a new database and user for WordPress in your hosting control panel.
3. Download the latest version of WordPress from their website.
4. Upload the WordPress files to your hosting server using FTP.
5. Run the WordPress installation wizard and enter your database information.
6. Complete the installation by setting up your website's title, username, and password.

And that's it! You now have a fully functioning WordPress website with MySQL as your database management system. 
Happy creating! 💻🌐 

https://www.youtube.com/watch?v=XEiyDwV4B4o
100% Best Way Free Traffic Increase to Website | linkedin | Traffic
Published: 2023-02-03 15:21:56

 Grow Your Youtube Channel

Google Keyword Planner - How to use Google Keyword Planner for Keyword Research - Fully Explained
Google ads keyword planner || Google Ads || Google's keyword || Google ads youtube || Best for youtuber




Google Ads Keyword Research Youtube
[Read more
](https://youtu.be/2jcMSvAkqt8)
CSS tutorial series: CSS Animation
Tags: beginners, css, webdev, tutorial
Published: 2023-02-03 15:14:08

You might've already come across animation on a website you previously visited and probably wondered how was it done. 

Some animation require the use of javascript which we will get to in a later post but first let's discuss how to animate in CSS.

## What is animation?
An animation is the gradual transition of an element's style to another using properties that sets the looks that the element will have at particular times.

## How is animation done ?
In order for an animation to work it must first be connected to an element.


|Property | function| value|
|---------|:-------:|:-----|
|`animation-delay`| defines the delay of the start time of the animation.| takes a value in seconds such as `2s`|
|`animation-direction`| defines if an animation is to be played forward or backward or even in cycles| `normal`, `reverse`,`alternate`, `alternate-reverse`
|`animation-duration`| indicates how long should the animation last| takes a value in seconds such as `5s`|
|`animation-fill-mode`| indicates how the element looks before and after it is applied| `none`, `forwards`, `backwards`, `both`|
|`animation-iteration-count`| indicates how many times the animation should be played| takes either a number or the value `infinite`|
|`animation-name`| defines a name that is used to select the `@keyframes` rule that specifies the animation| `none` or `custom-name`|
|`animation-play-state`| indicates whether to play or pause the animation| `paused`, `running`|
|`animation-timing-function`| determines how an animation develops over the course of each cycle|`ease`, `ease-in`, `ease-out`, `ease-in-out`, `linear`|


Let's discuss `animation-fill-mode` and `animation-timing-function`'s property values

`animation-fill-mode`:

- `forwards` will allow the element to keep the style values that were set by the last keyframe.

- `backwards` will allow the element to get the styles set by the first keyframe and keep it during the delay period.

- `both` The animation will follow rules for both forward and backward motion.

`animation-timing-function`: 

- `linear` allows the animation to retain the same speed from start to end.

- `ease` allows the animation to start slow then speed up before ending slowly.

- `ease-in` allows the animation to start slowly

- `ease-in-out` allows the animation to have a slow start and end.

- `ease-out` allows the animation to have a slow end.

**Syntax**

```
div {
  property: value;
  property: value;
  animation-name: example;
  animation-duration: 2s;
}

@keyframes example {
 from { property: value}
 to { property: value}
}
```

{% codepen https://codepen.io/fullstackjo/pen/vYabGoL %}
Diario de Python | #7. Color Choice: armando las rutas
Tags: python, devjournal, spanish
Published: 2023-02-03 15:07:22

Ahora que terminé la parte de definir los modelos y la BD, voy a armar los endpoints correspondientes para cada entidad.

Pero antes de continuar, decidí cambiar un poco la arquitectura de las clases para separarlas por sección.

## Nueva Arquitectura
Las carpetas quedaron de la siguiente manera:

```
- color
-- color_model.py: la clase Color que estaba en models.py
- vote
-- vote_model.py: la clase Vote que estaba en models.py
```

Por supuesto, en create_db.py tuve que modificar los imports:

```python
import color
import vote
```

Se que esto puede parecer rebuscado si lo comparamos con la solución anterior, pero con el tiempo, a medida que creemos nuevos componentes, notarán que es una buena decisión.

## Rutas

En principio voy a crear dos archivos de rutas (color_routes.py y vote_routes.py) los cuales contendrán un simple "hello" y se enlazarán a nuestras rutas en main:

```python
from color.color_routes import color_router
from vote.vote_routes import vote_router

app.include_router(color_router)
app.include_router(vote_router)
```

El import llama a "color.color_routes" porque existe un color_routes.py dentro de la carpeta color, la cual también contiene color_model.py. ¿Empiezan a notar la importancia de tener el código separado por entidades?

Ahora bien, dentro de color_routes.py estoy importando a color_router, el cual es mi objeto enrutador que compartiré con app. Veamos que tengo dentro:

```python
from fastapi import APIRouter, status

color_router = APIRouter(
    prefix='/color',
    tags=['color']
)


@color_router.get('/', status_code=status.HTTP_200_OK)
async def home():
    return "hello api color!"

```

El atributo "prefix" será el encargado de darnos una url del estilo "http://127.0.0.1:8000/color" y sobre los tags, veremos posteriormente la utilidad de este atributo.

Como ven, también cambia el get que antes era "app", porque nuestro enrutador ahora es color_router.

> Por cierto, el "@" implica que se trata de un Decorator (o decorador), una funcionalidad de Python que permite generar código adicional en tiempo de ejecución. Más adelante los estudiaremos en detalle.

Ahora que ya tenemos implementado nuestros enrutadores, podemos probarlos corriendo el servidor y llamando a "http://127.0.0.1:8000/color" o "http://127.0.0.1:8000/vote", dado que hicimos lo mismo en los dos. Esto dará como respuesta un "hello api color!" o "hello api vote!" según la ruta que utilicemos.
 
## Conclusiones
Ahora que tenemos las rutas preparadas, lo siguiente será generar los endpoints correspondientes para cada entidad; los cuales harán consultas a nuestra base de datos mediante un objeto Session. Ya lo veremos en la próxima entrega.
Ussd code for opay
Tags: ussdcodeforopay, opaycodes, opayussdtransfercode, opayloanussdcode
Published: 2023-02-03 14:45:50

<a href="https://www.bankussdcode.com/opay-transfer-code/#utm_source=backlinks&utm_medium=search&utm_campaign=darry+ring+us&utm_content=Michelle">https://www.bankussdcode.com/opay-transfer-code/</a>
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/dp57fhu7rb2bz1l4r8nz.jpg)
Devart Introduces a New Release of dbForge Schema Compare for PostgreSQL 1.3 With a Helpful Package of Updates
Tags: postgres, dbforge, devart
Published: 2023-02-03 14:35:17

---
title: Devart Introduces a New Release of dbForge Schema Compare for PostgreSQL 1.3 With a Helpful Package of Updates
published: true
description: Devart has rolled out a new version of dbForge Schema Compare for PostgreSQL, which also supports Amazon Redshift databases. This release brings a bunch of new features to Comparison Wizard and Text Editor
tags: #postgresql #postgres #dbforge #devart
# cover_image: https://direct_url_to_image.jpg
# Use a ratio of 100:42 for best results.
# published_at: 2023-02-03 14:24 +0000
---
Devart, one of the leading developers of database management software, ALM solutions, and data providers for the most popular database servers, has announced an update of [dbForge Schema Compare for PostgreSQL](?utm_source=dev.to&utm_medium=referral&utm_campaign=pr_postgresql_31.01.2023), a free GUI tool for schema comparison and synchronization.  

The core improvements that have been introduced are as follows: 
 
- New options have been added to Comparison Wizard – namely, the ability to specify databases to be compared, as well as the option to copy the original settings to the target database. 

- The usability of Text Editor has been improved with convenient shortcuts for the copy/cut and paste operations and triple clicks to select entire lines. 

- Another feature that has been implemented in this release is the display of RAISE [ NOTICE | WARNING | INFO ] in the Error List and Output messages. 
 

To learn more about the release, refer to https://blog.devart.com/dbforge-schema-compare-for-postgresql-v1-3-is-out.html 
 
About Devart 
 
Devart is a multi-product company that develops advanced tools for database development and administration, ALM solutions, data providers for database servers, as well as data integration and backup solutions. 
 
For additional information about Devart, visit https://www.devart.com/.
Emulator detection of Bluestacks and Nox Player comes to freeRASP v4!
Tags: flutter, freerasp, mobilesecurity, security
Published: 2023-02-03 14:35:10

[https://github.com/talsec/Free-RASP-Flutter/releases/tag/v4.0.0](https://github.com/talsec/Free-RASP-Flutter/releases/tag/v4.0.0
)

The Flutter community asked to include detection of Bluestacks and Nox Player emulators that are popular among gamers. The detection is very precise and quick. It takes into account HW and SW identifiers and can detect these emulators even with spoofed device profiles. This feature is now included in freeRASP v4. https://github.com/talsec/Free-RASP-Flutter/releases/tag/v4.0.0

Some quick ideas:
- You can use it to analyze how many users run your app on these emulators.
- Limit hacking attempts. Use the emulator detection together with the tampering detection.
- Limit cheaters. Correlate emulator instances with suspicious behavior.

Please don't limit users unnecessarily!
TronFAQ Telegram Bot Removes Messages that are older than 5 minutes
Tags: tron, blog, telegram
Published: 2023-02-03 14:24:06

The [TronFAQ Bot](https://steemyy.com/bots.php) now removes the messages of asking for test coins that are older than 5 minutes (300 seconds).

![15ed1329344136a886d4212fe1075d8.png](https://cdn.steemitimages.com/DQmc1vXtMGQ82hvnG1vrnydU1AQEN5m2Ey5Twejkn4bGwPY/15ed1329344136a886d4212fe1075d8.png)

![image.png](https://cdn.steemitimages.com/DQmQfxdU2iHBhsFikEdeXdj9o142vRQYCLNVCJzCrwU3byy/image.png)


![image.png](https://cdn.steemitimages.com/DQmQbc6q4Ax8D6Pd4cjnqMMyrkHYHEUpHrStPpNvsMMo9NA/image.png)

This is to make the channel cleaner - so it doesn't get spammed with these messages (once used and not needed).

<hr/>

### [Steem](https://steemyy.com) to the Moon!
You can swap the STEEM/SBD to USDT (TRC-20) via [Steem2USDT](https://steemyy.com/steem2usdt.php)
how to change user shell in Linux
Tags: linux, programming, cloud
Published: 2023-02-03 14:22:32

A user’s shell is the program that runs when they login to a Linux system. The default shell for most users is bash, but there are many other options available. To see a list of available shells on your system, run the following command: cat /etc/shells.

we can have the following shells in the system.
[root@host ~]# cat /etc/shells
/bin/sh
/bin/bash
/sbin/nologin
/bin/dash
/bin/zsh
/bin/tcsh
/bin/csh

There are many different types of shells available on Linux, each with their own strengths and weaknesses. Choosing the right shell can depend on your individual needs and preferences, as well as the type of Linux distribution that you are using.

Check this article to see [how to change user shell safely in Linux](https://www.howtouselinux.com/post/linux-change-user-login-shell-safely).
Measure your website's emissions
Tags: startup, webdev, sustainability
Published: 2023-02-03 14:18:54

Hey y'all,

Long time lurker, first time poster!

After reading that the internet accounts for 4% of the world's electricity (memes are worth it imo), my friend Ivan and I built a little tool to help us figure out how much CO<sub>2</sub> emissions our own websites were responsible for.

We realized a bunch of people were asking this same question, so we turned it into a service.
Besides **measuring** your emissions, it also gives you insights into what you can do to **reduce** them and optionally lets you **remove** them using carbon removal services.

Measuring your emissions is free while in beta, you can get started here:
https://backspace.eco/

We're also just starting out, so any feedback & suggestions are appreciated.

Learned a lot from dev.to, thanks for being such an awesome community!
Getting undfined while using context API please help
Published: 2023-02-03 14:14:57

import { useState, useContext, useEffect } from "react";
import { UserSate } from "./context/State";

const UserForm = (props) => {
  const [userDetails, setUserDetails] = useState({
    firstName: "",
    lastName: "",
    dob: "",
    gender: ""
  });

  const userContext = useContext(UserSate);

  const { user } = userContext;

  console.log("============>", user);

  const onChange = (e) => {
    setUserDetails({ ...userDetails, [e.target.name]: e.target.value });
  };

  const handleSubmit = (e) => {
    const user = {};
    user[e.target.name] = e.target.value;
    console.log(user);

    // updateUser(user);

    setUserDetails({ ...userDetails, [e.target.name]: "" });
  };

  return (
    <>
      <input
        placeholder="firstName"
        id="firstName"
        name="fistName"
        value={onChange}
      />
      <input
        placeholder="lastName"
        id="lastName"
        name="lastName"
        value={onChange}
      />
      <input placeholder="dob" id="dob" name="dob" value={onChange} />
      <input placeholder="gender" id="gender" name="gender" value={onChange} />
      <button onClick={handleSubmit}>Submit </button>
    </>
  );
};

export default UserForm;

=====================================================

import UserContext from "./State";
import bookings from "../Data/bookings";
import UserForm from "../UserSignUp";
import { useState } from "react";

const UserSate = (props) => {
  const [user, setUser] = useState(bookings);

  console.log("user", user);

  const updateUser = () => {
    console.log("anaaaa");
  };

  return (
    <UserContext.Provider value={{ user, updateUser }}>
      <UserForm />
    </UserContext.Provider>
  );
};

export default UserSate;
Essential plugin to have on your wordpress website
Tags: wordpress, webdev
Published: 2023-02-03 13:41:44

You have just installed a wordpress site and you are wondering what are the essential plugins to have on your site?

Today I share with you the plugins that I think are essential to have on your wordpress site.

**But what is a plugin?**

A plugin or extension (word used on the wordpress dashboard) aims to add features to your website and all without having to touch any line of code, pretty good, right?

To add a plugin, you must go to the extension page via the dashboard of your website and click on the "add" button to search and add a plugin.

**Well, now I know what a plugin is but how I choose it correctly?**

You must pay attention to the rating and the number of people who voted for the plugin, the number of active installations, the comments of the users and the date of the last update.
By crossing all this information, the plugin is more likely to be of good quality. For example, if the plugin is not regularly updated it can cause conflicts with your version of wordpress.

The first essential plugin I recommend is **Updraft plus**. It is an automatic backup plugin for your website to avoid any data loss. It allows you to back up files and database on a regular basis. You can choose where you want to store the backups (google drive, dropbox, FTP, one drive), schedule the backups and choose the number of backups to do.

The plugin exists in free or paid version. For example, the paid version allows you to manage your backups on a multi-site. The free version allows you to meet the main need to regular backup your site.

The second plugin is **WP Super Cache**. It is a plugin managed by the creator of wordpress that allows returning your wordpress site faster for users. Indeed, this one will cache, store some files on the hard drive or in RAM depending on the configuration, so that when users visit the same page, it can display faster.

There is a second very famous plugin which is **WP rocket** made by a French company (cocorico) but which is paying (47€/year for 1 site).

In the next post, I will talk about another essential plugin for your website.