Reusable Chart component for D3 - using prototypes and factories
This example demonstrates a reusable bar-chart component built with D3.js, using a factory method and prototype-based class to create configurable chart instances. The code defines a `BarChart.instanceOf` factory that returns chart objects with chainable accessor methods for width, height, bar padding, and fill color. When the `render` method is called on a selection, it binds to each data array, computes bar dimensions from the data extent, and appends SVG rectangles via `d3.select` and `selection.append`. The chart reads data directly from bound arrays, scaling bar widths proportionally to the maximum value, and applies the configured fill color. The implementation emphasizes encapsulation and reuse through JavaScript prototypes and closures, without relying on external data sources.
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