teleren/devto huggingface dataset:
React & Express on Ubuntu
Tags: react, express, node, ubuntu
Published: 2020-10-17 09:31:07

Hello guys
I am a web developer. I am developing simple web app using react & express on ubuntu.
I have a problem , code has been done.
it works well on win10, but does not work on ubuntu.
I am using "yarn dev" command....


this is package.json file in client directory

{
  "name": "reactcrud",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@date-io/date-fns": "^1.3.13",
    "@material-ui/core": "^4.11.0",
    "@material-ui/icons": "^4.9.1",
    "@material-ui/pickers": "^3.2.10",
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.5.0",
    "@testing-library/user-event": "^7.2.1",
    "date-fns": "^2.16.1",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-router-dom": "^5.2.0",
    "react-scripts": "3.4.3"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "proxy": "http://server.com:5000/",
  "description": "This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).",
  "main": "index.js",
  "devDependencies": {},
  "author": "",
  "license": "ISC"
}


and this is package.json file for express

{
  "name": "reactcurd",
  "version": "1.0.0",
  "scripts": {
    "client": "cd client && npm run build && cd build && npm start",
    "server": "nodemon server.js",
    "dev": "concurrently --kill-others-on-fail \"yarn server\" \"yarn client\"",
    "start": "node server.js"
  },
  "dependencies": {
    "@material-ui/pickers": "^3.2.10",
    "axios": "^0.20.0",
    "body-parser": "^1.19.0",
    "express": "^4.16.4",
    "express-session": "^1.17.1",
    "multer": "^1.4.2",
    "mysql": "^2.18.1",
    "nodemon": "^2.0.4",
    "passport": "^0.4.1",
    "passport-google-oauth": "^2.0.0",
    "sync-mysql": "^3.0.1"
  },
  "main": "server.js",
  "author": "",
  "license": "ISC",
  "description": ""
}


please help me...
Thank you...
Completed the Hactoberfest 2020 Challenge.....Thank u DigitalOcean
Tags: hacktoberfest
Published: 2020-10-17 09:25:47

 I'm a fresher at KIIT university ,Bhubaneshwar . I came to know about hacktoberfest and DigitalOcean by my seniors who encouraged us to take part in this challenge .They told us how contributing in these kind of open source repositories can help us gain more knowledge about the developers community
My first Open-source Contribution  HACTOBERFEST2020 !
Tags: hactoberfest
Published: 2020-10-17 09:23:18

## What I Learned From Hacktoberfest
![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/uwyeb8k70o0ibc5ccimr.jpg)
I want to thank all the Hactoberfest 2020 team to encourage to contribute to the open-source community. This is my first time contributing to the open-source community and earned a reward. #Swag #Hactoberfest2020
Deployed a smartcontract on XinFin and Ethereum.
Tags: blockchain, xinfin, ethereum, smartcontract
Published: 2020-10-17 09:18:27

Deployed a smartcontract of online Mediation between Two Parties on XinFin Hybrid Blockchain Network and Ethereum Public Blockchain Network. Both the remix working fine. Other things to be considered is the tech, where XinFin overtake #ETH in speed and fees.
Screen Shot of Ethereum Network
![Ethereum Network](https://dev-to-uploads.s3.amazonaws.com/i/p3uiuwxdjtp1l8wzspib.PNG)

Screen shot of XinFin Network
![XinFin Network](https://dev-to-uploads.s3.amazonaws.com/i/wg4m0az50twqaz0soi2x.PNG)
My First Hacktoberfest !!! Hacktoberfest2020!!!
Tags: hacktoberfest
Published: 2020-10-17 09:05:05

Hi Folks !!! Hope everyone is building something great.
This is Sayan Manna. I'm a CSE under graduate student and its my first contribution.
Today I will be sharing my journey of the hacktoberfest 2020 challenge.
## What I Learned From Hacktoberfest
So basically I'm a beginner and this is my first hacktoberfest. The journey was awesome. I learned many things because of this great initiative. I did 5 pull requests in this hacktoberfest. These are based on Data Structures and algorithms. I learnd many new things and contributed.
The 5 projects for which I completed this, are --
1.pull request link : https://github.com/ahampriyanshu/algo_ds_101/pull/162
   
Here I did Armstrong Number program in Java.
2.pull request link : https://github.com/Anuja-19/Snippets/pull/55
 
Here I did Stack operation in Java.
3.pull request link : https://github.com/Anuja-19/Snippets/pull/67
 
Here also, I did Selection sort algorithm in Javascript.
4.pull request link : https://github.com/FOSS-GCEK/Hacktoberfest/pull/53
5.pull request link : https://github.com/FOSS-GCEK/Hacktoberfest/pull/59

Did a python basic program.

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/yclbxx30d1wgmnhzd2tc.jpg)

So these are the contributions I made in my very first Hacktoberfest 2020. Hope to learn more!!
Thank You Digital Ocean
Classification
Tags: machinelearning, datascience
Published: 2020-10-17 09:01:50

Machine learning consists of two type of supervised tasks known as classification and regression. Today, we are going to discuss some important points about classification.
**Classification** is the process of predicting different classes from the provided information. Humans have this amazing ability to pick out different things from a cluster but it is much harder for a machine to perform the same task.
For example, movie reviews analysis could be considered a classification problem. For keeping things simple let's consider this problem as a binary classification problem, only predicting if the review is positive or negative.  A classifier utilizes some training data to understand how given input variables relate to the class. In our case, known positive and negative reviews have been used as the training data. When the classifier is trained accurately, it can be used to predict for a new data point.

##Classification Algorithms
There are a lot of classification algorithms but it is not possible to decide which one is superior to other. It depends on the problem and the given dataset.
###Decision Tree
![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/5um4v2dm62m0d53boi2x.png)
Decision tree builds models in the form of a tree structure. It uses the if-then rule set to distinguish between different classes. The rules are learned sequentially using the data one at a time. Important attributes are identified using the information gain concept.
Decision tree algorithm is prone to overfitting. To avoid this problem pre-pruning can be used, which stops the construction of the tree early.
###KNN
![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/97wcke83fipmyy13t65c.gif)
K-Nearest Neighbors algorithm put all the data points on a n-dimensional space. When a new data point is introduced to the model, it analyzes the k closest neighbors and returns the most common class as prediction.

To go more deep into algorithms check this [Link](https://www.analyticsvidhya.com/blog/2017/09/common-machine-learning-algorithms/) out.
#Evaluating the model
There are many metrics that can be used to evaluate the model.
###Accuracy
Accuracy is just ratio of correct prediction to the total number of classes.
Accuracy = (True Positive + True Negative)/Total
###Precision Score
Precision is the ratio True positives to the total number of positive predictions.
Precision = (True Positives)/(True Positives + False Positives)
###Recall Score
Recall is the ratio of True Positives to the sum of True positives and False negatives.
Recall = True Positives/(True Positives + False Negatives)

There are many other metrics that are used in machine learning. This [Link](https://towardsdatascience.com/20-popular-machine-learning-metrics-part-1-classification-regression-evaluation-metrics-1ca3e282a2ce) can help you dig more into different type of metrics.
Completed Hacktoberfest
Tags: hacktoberfest
Published: 2020-10-17 09:00:10

This time not only did I make PRs but also maintained an Open Source Org (github.com/Auto-DL). It was fun! Though my maintainer-side work is still left :)

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/ncqvfx8dzpvu2ije7er1.jpg)

Daily I get PRs I need to review and give my feedback. I get to see how different each and every individual is, same issue, same line change and yet drastically different pull requests. The way the title, description, issue linking is done, well according to my observation, it indeed is unique to everyone :)
What I Learned From Hacktoberfest

Tags: hacktoberfest
Published: 2020-10-17 08:48:20

## 
<!-- What did you learn that can help others contribute to the project you worked on? What did you learn that can help the users of that project?! -->
Learned about the github issues and pull requests.
How to abide by the contributor's guideline in every repository.
Why open source projects are important and maintained.
My hacktoberfest journey!
Tags: hacktoberfest
Published: 2020-10-17 08:43:25

## What I Learned From Hacktoberfest
It was the first time when I took participation in this fest + first time when I'm writing a post in Dev ;p ... I really enjoyed this fest a lot!! It was literally my first time contribution on some open sources as well as I learnt to pull and merge requests, got to explore certain amazing repos and what not! Truly loved it and would like to participate again through the upcoming years in it!

<!-- What did you learn that can help others contribute to the project you worked on? What did you learn that can help the users of that project?! -->
One more hacktoberfest
Tags: hacktoberfest
Published: 2020-10-17 08:27:28

## What I Learned From Hacktoberfest

<!-- What did you learn that can help others contribute to the project you worked on? What did you learn that can help the users of that project?! -->

Hacktoberfest, every year reminds us that contributing to community is an exciting thing and the satisfaction you get is limitless.
Taskord is out now 🎉
Tags: showdev, opensource, productivity
Published: 2020-10-17 08:27:18

Hey folks 👋

We are now live on ProductHunt https://meow.ph/taskord

For the past three months, I was working on a project called Taskord as a part of 100 Days of Code. Fortunately, the project now turns into a public product.

Make sure to signup today https://taskord.com

## What is Taskord?

Taskord is free open source social media for tasks! where users can post public and private todos, ask questions, and launch products. Taskord helps you to get things done together with the members of the community.

## Features

- **Login / Signup**
 - Secured PWNED Validator 🛡
 - Social auth via Google or Twitter 🌐
 - Magic Link authentication 🔮
- **Tasks**
 - Pending Tasks ⌛
 - Done Tasks ✅
 - Due date 📅 (only for patrons)
 - Multiple Image Upload 📸
- **Questions**
 - Answers 💬
 - Trending Questions 📈
 - Patron's Questions 🔒 (only for patrons)
- **Product**
 - Product related tasks ✅
 - Subscribe ➕
 - Release Updates 📦
 - Stats 📊 (Coming Soon)
- **User**
 - User related tasks ✅
 - Follow ➕
 - Reputations 🎮
 - Goals 🎯
 - Stats 📊 (Coming Soon)
- **Integration**
 - GitHub 🐙
 - GitLab 🦊
 - Webhook ⚓
- **Deals** 🎁 (only for patrons)
- **Meetups** 🤝 (coming soon)
- **Dark mode** 🌑 (only for patrons)

We are looking forward to your feedback, roasts, bugs, features, anything you want!

Thank you.
Free ✿ icons for all !
Published: 2020-10-17 08:26:01

Hey there 👋, we are excited to introduce **FontUltimate**, a font icon library of beautiful vector icons which are scalable, easy to use & extremely fast to load. It's ready to use and **free** for any personal & commercial project.

**♦ Features**

✿ Explore the library, choose an icon, copy-paste the code inside your Web-App and It's done.
```
<i class="fu-solid fu-hippo" aria-hidden="true"></i>
```
![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/ku9jir0iljzjvf941omx.gif)             
 *************
       
✿ You can choose icons from different categories.

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/7e05uycbf5hmt0zmjbxf.gif)
***
✿ You can also search for the icons, it's really simple.

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/rktqi9v0oczjl0hhb6af.gif)

***
✿ It's fast and ready to use, made specifically for developers & designers.

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/bo41b6nqzbd9nhe1l148.gif)
***

We are launching soon on Product Hunt. So if you would like to get an early access of [**FontUltimate**](https://www.producthunt.com/upcoming/fontultimate/) and be the part of this project, please do **Subscribe** by clicking [**here**](https://www.producthunt.com/upcoming/fontultimate/). It's completely free to subscribe.

  **♦ Subscriber Benefits** ( *What subscribers will get?* )

✿ Will get the early access to the full library for free.

✿ Can use it in any number of personal & commercial projects. 

✿ Can give feedback.

✿ Will get an access to FontUltimate's private #Slack channel.

✿ Will get notified about the new releases before any other user (non-subscriber).


You will ♥ using it as much as we ♥ making it.

Looking forward to see you. Please do [**Subscribe**](https://www.producthunt.com/upcoming/fontultimate/) .


Yours Sincerely,

Maroof Khan
Formulas to Vlookup Values from Bottom to Top in Excel 365!!
Tags: excelformula, excelformulas
Published: 2020-10-19 11:37:19

---
title: Formulas to Vlookup Values from Bottom to Top in Excel 365!!
published: true
date: 2020-10-17 07:36:09 UTC
tags: ExcelFormula,Excelformulas
canonical_url: https://geekexcel.com/formulas-to-vlookup-values-from-bottom-to-top-in-excel-365/
---

## Formulas to Vlookup Values from Bottom to Top in Excel Office 365:

In this article, we will discuss the Excel formulas to Vlookup Values from Bottom to Top. Get an official version of **MS Excel** from the following link: [https://www.microsoft.com/en-in/microsoft-365/excel](https://www.microsoft.com/en-in/microsoft-365/excel)
## Formula Syntax:

-  To Vlookup values from Bottom to Top in Excel, use the below formula.

**=[LOOKUP](https://geekexcel.com/use-lookup-function-in-microsoft-excel-365-simple-methods/)(2,1/([Sheet](https://geekexcel.com/how-to-use-excel-sheet-function-in-office-365-with-examples/)5!$A$2:$A$7=Sheet5!A11),Sheet5!$C$2:$C$7)**

### Example:

- Here we are going to learn this with the following Example table.
- In this image, we give the input values in **Column A** , **Column B** , **Column C** & **Column D**.
- Then, enter the given formula in a selected area.
- After applying the formula, it will display the results in the selected cells.

![](https://eadn-wc04-371788.nxedge.io/cdn/wp-content/uploads/2020/07/cv44.png)

## Explanations for Syntax:

- **LOOKUP** – The main purpose of the [**LOOKUP Function**](https://geekexcel.com/use-lookup-function-in-microsoft-excel-365-simple-methods/) is to match lookup in one-column or one-row range. It also returns the corresponding value from the one-column or one-row range.
- **Sheet** – It will return the index number of the sheet in Excel. Read more on [**Sheet Function**](https://geekexcel.com/how-to-use-excel-sheet-function-in-office-365-with-examples/).

## Wind Up:

In this short tutorial, you can understand how to use the **formulas to  Vlookup Values from Bottom to Top in Excel Office 365**. Don’t forget to drop your valuable **feedback** in the below **comment** section. Thank you so much for Visiting Our Site!! Continue learning on **[Geek Excel](https://geekexcel.com/)!!**

### Read Ahead:

- [**Excel Formula For Finding Vlookup Value Between Two Numbers!!**](https://geekexcel.com/excel-formula-for-finding-vlookup-value-between-two-numbers/)
- 

**[Formula to find Vlookup & Return Matching Values from Multiple worksheet](https://geekexcel.com/formula-to-find-vlookup-return-matching-values-from-multiple-worksheet/)**
Hacktoberfest experience
Tags: hacktoberfest
Published: 2020-10-17 08:22:39

## What I Learned From Hacktoberfest

Hacktoberfest was a great opportunity for me to enter the world of open source. I discovered a great community of developers who shared their knowledge with me, and I did my best to be of help to them. I think this is a great opportunity especially for all beginners who have not worked on open source because they will be greeted by a great community and gain enough experience to continue working on many projects. It also feels good to plant a tree!
SSR Cache in React?
Tags: react
Published: 2020-10-17 08:20:06

Lately, I'm trying to migrate an old Nodejs project from using `ejs` + `jQuery` to using `React`. This migration will dramatically decrease the cost of the development because the content of the rendered HTML depends on the user information brought by each request, which means before the migration I need to write loads of if/else in ejs templates to decide which part should be rendered. Using react server-side rendering helps me out of this hell.

However, it raises the concern about the performance of rendering the whole application per request without any caching strategy. In my case, I cannot pre-render the HTML page ahead of a user request, so I can't make use of solutions like the [Static Generation](https://nextjs.org/docs/basic-features/pages#static-generation-recommended) that Nextjs provided.

I did some searching and found a related [RFC](https://github.com/reactjs/rfcs/pull/16) post. Though the issue is open, it seems like it remains inactive for a long time and the discussion is stale. Is there already a solution to this problem or it's just something that is out of the scope of React? I would really appreciate it if someone could help me out here.
FIRST CONTRIBUTION TO OPEN SOURCE
Tags: hacktoberfest
Published: 2020-10-17 08:03:01

From Hacktoberfest I learned to provide quality content so that the other developers can accept your contribution.

SO this was my first time to contribute in the open source and **Hactoberfest** gave me the opportunity and chance to learn and use the GITHUB so that I can contribute in the open source.
> You can code, It is good. But if your code is not acceptable by others developers than the code doesn't worth.
HACTOBERFEST encourage folks to contribute, sometimes the maintainer doesn't accept the code and this let us think about the issue and give rise to point that where do I lack, and what is the problem in my code.

**So HACTOBERFEST2020 help me in learning many new things, and I am thankful to DIGITAL OCEAN as they are the organizer of HACTOBERFEST2020**
Amazing Hacktoberfest Experience
Tags: hacktoberfest
Published: 2020-10-17 08:01:53

## What I Learned From Hacktoberfest

I learned a hell lot from Hacktoberfest! It was a tremendous experience.. I explored almost every domain of programming in this 17 days of time. I contributed to Backend project, DSA project, ML project, and also OOPs project. This contribution somehow helped me revisit my basics again and helped me sharpen my core concepts. These contributions may look little, but are of great help in order to make you a great developer!
 
Providing such a great opportunity to developers like me is a great gesture from Digital Ocean in the form of Hacktoberfest. It really motivates us to expand our limits!

Hope to see myself at next year's fest! Cheers!!
HacktoberFest 2020
Tags: hacktoberfest, opensource, codenewbie
Published: 2020-10-17 08:00:47

## HacktoberFest Experience

I completed my #Hacktoberfest 2020 challenge by submitting all of the four (+1) pull requests! It was my first time participating in the event, and I had a lot of fun being a contributor and as a maintainer. I'm looking forward to involving myself more in Open-Source projects. 
<br/>
## What I Learned From Hacktoberfest
I opened a repository that accepted all the contributions that can help the students/Graduates to prepare for interviews/internships/fellowships. The repository consists of programs on different data structures and algorithms, questions from different interviews and online judges, basic programming problems, etc, in all the possible programming languages including Python, C++, C, Java, etc.
{% github ShreyaDhir/HacktoberFest2020 %}


## How Can It Help Strengthen The Community
For code-newbies, Open-Source is an excellent way to learn more about the technology field they are interested in. They can learn more about the stack. That's why many different software companies have stepped-out and have actively searched for diverse and highly-motivated contributors to help their product grow.
<br/>
## A Message For Contributors
What I learned as a maintainer that can help others contribute efficiently is to write a clear README.md/CONTRIBUTING.md explaining all the necessary steps and commands to follow in order to have a smooth Pull Request experience. Not only do the participants participate more, but it also helps the maintainers maintain their projects without any hassle.

Happy Learning! 😊

<!-- What did you learn that can help others contribute to the project you worked on? What did you learn that can help the users of that project?! -->
Hacktoberfest 2020
Tags: hacktoberfest
Published: 2020-10-17 07:55:24

## What I Learned From Hacktoberfest

Its not necessary to have knowledge of everything when you work in open source. I learn when I work. I bring the bottom-up approach to contribute. Well, I reviewed the code for cpython and was a contributor to Python Turtle(the learning platform for python). Moreover I found the community really responsive and helpful. The guys with great status are communicating and  were helpful to me. I learn a lot from them.
Hacktober Fest 2020
Tags: hacktoberfest, github, opensource
Published: 2020-10-17 07:46:50

Initially, I thought it was going to be hard to contribute here, but then slowly I realized that it was not that difficult at all. The learning experience was great for me!
My learnings-
1. How Open-Source works and what significance it has.
2. Every contribution is important - be it small or big.
I am going to continue contributing to open-source and increase my learnings even more!
Dockerize an existing Rails application
Tags: docker, rails, ruby, container
Published: 2020-10-17 07:46:13

crea un app in rails:
```
rails new demo -d mysql
```

create a Dockerfile:
```
FROM ruby:2.5.1
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
RUN mkdir /usr/src/demo
WORKDIR /usr/src/demo
ADD Gemfile /usr/src/demo/Gemfile
ADD Gemfile.lock /usr/src/demo/Gemfile.lock
RUN bundle install
ADD . /usr/src/demo
RUN RAILS_ENV=production bundle exec rake assets:precompile --trace
```

create docker-compose.yml
```
version: '2'
services:
  app:
    build: .
    command: bundle exec puma -C config/puma.rb
    volumes:
      - .:/usr/src/demo
    expose:
      - "3000"
    environment:
      RACK_ENV: production
      RAILS_ENV: production
    ports:
        - 3000:3000
	depends_on:
      - db
    links:
      - db
  
  db:
    image: "mysql:5.7"
    environment:
      - MYSQL_ROOT_PASSWORD=password
      - MYSQL_DATABASE=db
      - MYSQL_USER=root
      - MYSQL_PASSWORD=password
    ports:
      - "3306:3306"
  
  phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin
    restart: always
    ports:
      - 8081:80
    environment:
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: password
```