(function() {
Array.from(document.querySelectorAll('textarea')).map(function(ta) {
  var container = document.createElement('div');

  var asc = document.createElement('button');
  asc.textContent = '↑';
  asc.addEventListener("click", function(e) {
    e.preventDefault();
    ta.value = Array.from(new Set(ta.value.split("\n"))).sort().join("\n");
  });

  var dsc = document.createElement('button');
  dsc.textContent = '↓';
  dsc.addEventListener("click", function(e) {
    e.preventDefault();
    ta.value = Array.from(new Set(ta.value.split("\n"))).sort().reverse().join("\n");
  });

  container.appendChild(asc);
  container.appendChild(dsc);
  ta.parentNode.insertBefore(container, ta);
})
})()