install yarn via npm code example

Example 1: install yarn

npm install -g yarn

Example 2: problem installing yarn ubuntu

sudo apt remove cmdtest
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt update
sudo apt install yarn

Example 3: macos install yarn

brew install yarn

Example 4: npm install yarn equivalent

npm install 'pckg-name'   -> yarn add 'pckg-name'
npm uninstall 'pckg-name' -> yarn remove 'pckg-name'
npm run 'your-script'     -> yarn run 'your-script'
npm init 				  -> yarn init
npm install 			  -> yarn OR yarn install

## In yarn flags like: --save-dev --save are used the same way

Example 5: yarn react install

There are two ways where you can initiate a REACT app.. 
1. Using npm : npm init react-app <app_name>
	 example : npm init react-app sampleApp
2. Using yarn : yarn create react-app <app_name>
	 example : yarn create react-app sampleApp