Let's make a bar chart
This example shows a static bar chart of population data for ten countries, using SVG rectangles colored in steel blue. The visualization initially draws each bar with a fixed width of 300 pixels and a fixed height of 400 pixels, meaning the bars do not yet encode the population values visually. The code loads data from a CSV file using d3.csv, converts population strings to numbers with a unary plus operator and a multiplication factor of 1000, and then appends rectangles via d3’s data join and selection APIs. It also defines a d3.scaleLinear for the x-axis, though the scale is not yet applied to the rect dimensions.