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Three bar charts show categorical values for groups A, B, and C, with a button-driven transition between two predefined datasets. Using d3.v4 with React, the visualization renders SVG rectangles that animate their heights and positions over one second via `transition()`. The y-axis scale is fixed from 0 to 20, while the x-axis uses `d3.scaleBand`. Clicking the buttons calls an `update` function that rebinds data and triggers the smooth visual change.
AI-generated descriptionSmiley face implementation with React.
MIT Licensed