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D3 Selection Exploration (Exit Selection Effect)

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Nnim@brejnholt.dk
Last edited Jan 24, 2024
Created on Jan 24, 2024

This example demonstrates D3’s exit selection effect by animating a fluctuating number of circles that move along sine-wave paths. Using `d3.select`, `d3.range`, and a `setInterval` loop, it updates the data array each frame, then merges newly entered circles with existing ones via `.enter()` and `.merge()`, while `.exit().remove()` instantly deletes circles that no longer have corresponding data. The visualization uses an SVG rendering with dynamic `cx` and `cy` attributes, showing how D3 manages DOM elements for changing data sizes without transitions.

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