{
let rects = d3.select("#viz2").selectAll("rect").data(numbersObj);
rects.exit().remove();
rects = rects.enter().append("rect").merge(rects);
rects
.attr("x", 10)
.attr("y", function (d, i) {
return 10 + i * 10;
})
.attr("width", function (d, i) {
return d.x * 10;
})
.attr("height", 8)
.attr("fill", "green");
}