get unique emails

app.js

var _ = require('underscore')
  , redis = require('redis')
  , fs = require('fs')
  , client = redis.createClient();

var content = fs.readFileSync('./bounces', 'utf-8');
content = JSON.parse(content);

_.each(content.items, function(item) {
  client.sadd('mail.del', item.address);
});

content = fs.readFileSync('./complaints', 'utf-8');
content = JSON.parse(content);

_.each(content.items, function(item) {
  client.sadd('mail.del', item.address);
});

for (var i = 1; i < 5; i++) {
  content = fs.readFileSync('./lohasnews' + i, 'utf-8');
  content = JSON.parse(content);

  _.each(content.items, function(item) {
    if (item.subscribed) client.sadd('mail.all', item.address);
    else client.sadd('mail.del', item.address);
  });
}

for (var i = 1; i < 5; i++) {
  content = fs.readFileSync('./shopnews' + i, 'utf-8');
  content = JSON.parse(content);

  _.each(content.items, function(item) {
    if (item.subscribed) client.sadd('mail.all', item.address);
    else client.sadd('mail.del', item.address);
  });
}

client.sdiffstore('mail.left', 'mail.all', 'mail.del', redis.print);

client.smembers('mail.left', function(err, results) {
  _.each(results, function(r) {
    console.log(r);
  });
});