Concept of Merge_Join _Functions_Modules

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Concept of Merge_Join _Functions_Modules

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Last edited Aug 9, 2025

Created on Aug 9, 2025

This example demonstrates how merge and join functions work in D3 by animating a set of circles whose positions, radii, and count change over time via a `setInterval` timer. It shows how `selectAll`, `data`, and `join('circle')` merge new data with existing SVG elements, while separate `vizData.js` modules use ES6 `import`/`export` syntax to keep the code scalable. The visualization uses `d3.range` to generate data points and `d3.select` to append an SVG to the body, with the animation updating every 200 milliseconds.

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