Loading external data
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This example demonstrates loading external data from a JSON file and rendering it as a horizontal bar chart. The data contains employee names, titles, ages, and bonus statuses, with age plotted against name using D3 v4’s `d3.json` to fetch the file. Scales `d3.scaleLinear` and `d3.scaleBand` position the bars, while `d3.axisLeft` and `d3.axisBottom` generate axes. The SVG output is styled with hover effects in CSS, and the chart updates once data is loaded asynchronously.
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