readfile.js

var data = fs.readFileSync('/etc/passwd');

/* This code would start 1000 simultaneous asynchronous file reads, and run the do_next_part() 
function immediately. This has several problems: first, we’d like to wait until 
all the file reads are done until going further.*/

for(var i = 1; i <= 1000; i++) {
  fs.readFile('./'+i+'.txt', function() {
     // do something with the file
  });
}

do_next_part();