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Gist 0ad3913f0850c73deb09348eeb1c6e08

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Aadamjanes
Last edited Mar 17, 2018
Created on Mar 17, 2018

This example demonstrates a data-join update pattern for circles in a D3.js visualization. It shows how existing SVG circle elements are bound to a new dataset using `g.selectAll("circle").data(data)`, a core D3 concept that prepares the scene for entering, updating, or exiting elements. The code uses the D3 selection API to join the new data with the old elements, making it a foundational step for dynamic transitions or rescaling. The visualization itself is not yet animated or interactive—it only establishes the data binding, leaving subsequent update logic (such as position or radius changes) out of the visible snippet.

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