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Melting Data for Multiple Lines

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Ssafdarawan
Last edited Jun 11, 2020
Created on Jun 11, 2020

This example shows population trends over time by region, with multiple colored lines in an SVG chart. The data is processed by melting wide-format UN population estimates into tidy long-form rows using `range` and `timeParse`. The visualization uses `scaleTime`, `scaleLinear`, `scaleOrdinal`, `line` with `curveBasis`, `nest`, and `axisLeft`/`axisBottom`. A custom color legend displays categorical regions, and lines are sorted by their final population value using `descending`.

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