Nodejs

# Node.js

# versions 
node -v 
node -p 'process.versions.v8'

# Install nodejs
# Using Debian, as root 
sudo curl -sL https://deb.nodesource.com/setup_5.x | bash - 
sudo apt-get update
# https://www.digitalocean.com/community/tutorials/how-to-install-node-js-on-an-ubuntu-14-04-server
sudo apt-get install -y nodejs
sudo apt-get install npm
# then updated using http://stackoverflow.com/questions/8191459/how-to-update-node-js

#update system debian: 
sudo apt-get update 
# Fetches the list of available updates 
sudo apt-get upgrade 
# Strictly upgrades the current packages 
sudo apt-get dist-upgrade 
# Installs updates (new ones)

npm & Tools

# update
apt-get update
npm update -g

#update all globally installed packages of npm
npm update -g
# updates all package.json dependencies which are marked to be updated (Not a fixed version)
npm update <--save/--save-dev>
# check outdated dependencies: 
npm outdated

# Update packages in package.json file 
npm install -g npm-check-updates
npm-check-updates -u
npm install 

# Install packages: 
npm install <--production/--dev> 
# check globally installed npm packages
npm list -g --depth=0

Tools: 
• browser-sync
• # web components tester: npm i -g web-component-tester web-component-tester-istanbul

Options & Shipped, Staged, In progress features

# V8 options - e.g. --use_strict (enforce strict mode)
node --v8-options | less
# e.g. options for garbage collection which is useful when mesasuring memory usage (because it allows manually forcing garbage collector from withen javascript): 
node --v8-ptions | grep gc

# staged features flag
node --harmony -p '<command>'

# In progress features flag - specific to each feature
# show in progress features: 
node --v8-options | grep "in progress"

# "v8" module: 
# set at runtime using v8 module. After requiring it:
v8 
# show heap memory (dynamically allocate memory portion)
v8.getHeapStatistics()