Fork of JS data joins
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A dynamic swarm of circles continuously enters and exits an SVG canvas, with each circle oscillating vertically and changing radius based on a sine wave, creating a pulsing, fluid motion. This animation demonstrates D3 data joins, where the `selection.data()` method binds an array of circle objects to the SVG elements, and the `.join()` method efficiently adds, removes, and updates them. The data originates from custom functions `makeData` and `vizData`, which generate coordinates and radii from the `d3` library, and `setInterval` drives the 60fps loop.
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