9. key-function-update-pattern

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9. key-function-update-pattern

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Last edited Aug 1, 2016

Created on Jul 22, 2016

This example demonstrates the D3 key-function update pattern for binding data to existing SVG elements. It shows the alphabet rendered as text elements, with each update randomly shuffling and slicing the dataset, highlighting entering elements in green and updating elements in dark gray. The code uses `selection.data(data, keyFunction)` to join data by value rather than index, then applies `merge()` and `remove()` to manage the enter, update, and exit selections. The visualization runs on a one-second interval, using `d3.shuffle` to generate new sequences.

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