Typing thingy...

typethis.js

process.stdin.setEncoding('utf8');

var str = "File I/O is provided by simple wrappers around standard POSIX functions. To use this module do require('fs'). All the methods have asynchronous and synchronous forms.";

console.log("Hello! ");
console.log("Type this out and press return: ");
console.log("--------------------------");
console.log(str);
console.log("--------------------------");
process.stdout.write("Press enter to start: ");

var starttime, difftime;
var start = false;
process.stdin.on('data', function (chunk) {
  if (start == false) {
    start = true;
    starttime = process.hrtime();
  }
  else {
    if (chunk.indexOf(str) == 0) {
      difftime = process.hrtime(starttime);
      var nano = difftime[0] * 1e9 + difftime[1];
      console.log("You took " + nano + " nanoseconds to type " + str.length + " characters. ");
      console.log("That is aproximately " + ((str.length + 1) / nano * 1e9) + " char/sec, " + (nano / 1e6 / (str.length + 1)) + " ms/char. ");
      process.exit();
    }
    else {
      process.stdout.write("You have errors in your typing, press enter to try again: ");
      start = false;
    }
  }
})