level2.js

var counts = {};
var total = 0;

function freqIP(ip) {
  var count = counts[ip];

  if (count == undefined)
    count = 1;
  else
    count++;

  total++;

  if (total > 10) {
    total = 0;
    counts = {};

    return ((count / 10.0) >= 0.10);
  }

  return false;
}

var blacklist = {};

function currentlyBlacklisted(ip) {
  if (blacklist[ip]) return true;

  blacklist[ip] = freqIP(ip);

  return blacklist[ip];
}