20 Digits of Pi in JSX

import React from 'react';
import ReactDOM from 'react-dom';

// Write code here:
const math = (
 2 + 3 = {2 + 3} 
);
ReactDOM.render(math,
document.getElementById('app')
  );

Git & GitHub Crash Course: Create a Repository From Scratch!

git clone URL

git status

git add README.md

git status

git commit -m "Initial commit"

git push origin master

git add index.html (adding to git after creating index.html)

git diff README.md (what lines have changed)

git commit -m "Second commit" (m stands for message here)

git log

git checkout README.md (undo if you mess up your code)

https://www.udemy.com/course/git-and-github-crash-course-creating-a-repository-from-scratch/learn/lecture/16293114#overview

Making Circle from Square in Python using turtle module

import turtle

my_turtle = turtle.Turtle()

def square(length, angle):
    for i in range(4):       
        my_turtle.forward(length)
        my_turtle.right(angle)

for i in range(50):
    my_turtle.right(10)
    square(100,90)

Visit Count Session in Node and Express

        if(!request.session.visitcount){

            request.session.visitcount = 0;

        }

        request.session.visitcount += 1

        console.log(`Number of visits: ${request.session.visitcount}`)

Install ESlint and Prettier for Nodejs in Visual Studio

ESlint

npm install -d eslint

npx eslint --init

Middleware apply in express to search for matching files like missing css/images

app.use(express.static(path.join(__dirname,'./static')))

Node JS Tricks

• If Cannot install thirdparty application via terminal, you will need package.json file for that.

To install package.json file, write this in your terminal

npm init

• For automated loading of console in visual code or other text editor, you need to install nodemon. For that, you need to install globally with keyword -g

npm install -g nodemon 

• To access in console bar with nodemon, write this in terminal
  nodemon .\demo.js
• If  You see the error while running nodemon, Visual studio code cmd error: Cannot be loaded because running scripts is disabled on this system, follow this link

Simple Test and Async Test with Jasmine

npm install --save-dev jasmine

./node_modules/.bin/jasmine init

npm install --save-dev request