Making a Bar Chart
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This example visualizes population figures for the ten most populous countries using a basic bar chart layout in SVG. It loads data from a CSV file containing country names and population numbers, converting the population strings to numeric values. The visualization uses D3 v5 with `d3.select` to manage the SVG element and `d3.csv` for data loading. A `scaleLinear` is defined but not yet configured with domains or ranges, while the data join appends rectangles of fixed width and height to the chart.
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