Node.js: The global object / require

1. console.log()

2. slice()     # String.slice(len)

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Include variable in a string  var name = "Er Gou"   console.log(`Hi, this is ${name}`) => Hi, this is Er Gou

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3. _dirname  # full path current path, where is the module located at

4. _filename  # current path as well as the file's name 

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require() # you installed in node, give you some tool to handle on path

var path = require('path')

path.basename(_filename)  -> pluck the file name out .