barca

import urllib.request
with urllib.request.urlopen('http://python.org/') as response:
   html = response.read()
   with open("stored.html", "r+") as file:
       if not (str(file.read()) == str(html)):
           print("THIS IS WHERE YOU ALERT")
       file.seek(0) #sets file pointer to beginning 
       file.truncate() #empties the file
       file.write(str(html))

barca

// basic performance test of let and var in node v5.2.0

"use strict"
var n = Date.now();
var count = 0;
for(var i = 0; i < 10000000000; i++){
  count += i;
}
console.log(Date.now() - n);
//run 1:35443