get-email-percent.js

var fs = require('fs');
var emailName = process.argv[2];
var percent = process.argv[3];

var emails = require('./' + emailName + '.json');
var newEmails = emails.slice((emails.length * (percent / 100)));
console.log(
  'Do emails end the same? %s',
  emails[emails.length - 1] === newEmails[newEmails.length -1]
);
console.log('Original email list size: %s', emails.length);
console.log('New Email list size: %s', newEmails.length);
fs.writeFileSync('./emails.json', JSON.stringify(newEmails));