Count lines added/removed with Bitbucket

coutLines.es6.js

(() => {

  const CLASS_LIST = [
    {type: 'added', className: '.lines-added'},
    {type: 'removed', className: '.lines-removed'}
  ];

  const stats = CLASS_LIST
    .reduce((accus, o) => {
      const total = Array
        .from(document.querySelectorAll(o.className))
        .map(item => +item.textContent.trim().slice(1))
        .filter(Boolean)
        .reduce((a, b) => a+b, 0);
      accus[o.type] = total;
      return accus;
    }, {});

  console.log(`There are ${stats.added} lines added and ${stats.removed} lines removed`);

})();

coutLines.js

(function countLines() {
  var stats = {
    added: 0,
    removed: 0
  };

  var counter = function(className) {
    return Array.prototype.map
      .call(document.querySelectorAll(className), function(item) {
        return +item.textContent.trim().slice(1)
      })
      .filter(Boolean)
      .reduce(function(a,b) {
        return a + b;
      },0) || 0;
  };

  stats.added = counter('.lines-added');
  stats.removed = counter('.lines-removed');

  console.log('There are %d lines added and  %d lines removed', stats.added, stats.removed);
})();