text: var ProgressBar = require('../index.js');
  
  var bar0 = new ProgressBar({
    current: 0
  });
  
  var bar1 = new ProgressBar({
    current: 10
  });
  
  var bar2 = new ProgressBar({
    current: 20
  });
  
  var bar3 = new ProgressBar({
    current: 30
  });
  
  var bar4 = new ProgressBar({
    current: 40
  });
  
  var bar5 = new ProgressBar({
    current: 50
  });
  
  var timer = setInterval(function () {
  
    bar0.tick();
    bar1.tick();
    bar2.tick();
    bar3.tick();
    bar4.tick();
    bar5.tick();
    if (bar0.completed
      && bar1.completed
      && bar2.completed
      && bar3.completed
      && bar4.completed
      && bar5.completed) {
      clearInterval(timer);
    }
  
  }, 100);
  