Key function

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Last edited Mar 15, 2021

Created on Mar 15, 2021

This example demonstrates the D3.js data join lifecycle by visualizing how the enter, update, and exit selections operate when binding an array of objects to SVG elements. An animated walkthrough steps through selection creation, data binding with a key function (`d=>d.id`), and key computation for both elements and data, using dashed rectangles to label the three selection states. The SVG rendering includes interactive "Next" buttons that advance the sequence, with D3 v5 transitions fading in key labels as the data join proceeds.

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