Parallel Coordinates with Brushing (Heart_Failure_Prediction)
This parallel coordinates visualization uses D3.js to explore heart disease data, mapping clinical variables like age, cholesterol, resting blood pressure, and maximum heart rate across categorical dimensions. Each polyline represents a patient, colored by heart disease status, with brushing enabled on each axis to filter the dataset interactively. Brushed intervals constrain the data across all selected dimensions simultaneously, and the filtered subset is recomputed with memoized efficiency, updating the rendering in real time. The plot includes categorical and quantitative axes, a legend, and animated transitions.