d3-lifestyle

// 1. selection an element
var chart = d3.select(".chart");
var bar = chart.selectAll("div");
// 2. then we have to join data to that element
var data = [4,3,5,33,5,67]
var barUpdate = bar.data(data);
// 3. enter/update/exit
var barEnter = barUpdate.enter().append();
// 4. add/update/remove attr, content, styles, etc
barEnter.style("width", function(d){
  return d * 10 + "px";
})