Use a keyed D3 data join to stop reordered data from reusing the wrong DOM nodes
A practical guide to D3’s data join pattern: bind data by identity, handle enter and exit selections, and merge updates without reusing the wrong nodes.
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d3jsd3.js Key Function Default Identity Behavior Lacks Deterministic Constraint
d3.js applies a default key function that uses strict equality (===) on the datum value, treating each object's identity solely by its value. When the data array is reordered, filtered, or mapped, distinct objects may yield the same key, causing the join to mistakenly merge them and produce unintended enter or exit transitions. Developers seek a deterministi
Limits of D3.js .enter() selection with key functions
Limits of D3.js .enter() selection with key functions The goal is to guarantee that each new datum added to a data array results in exactly one corresponding DOM element when using D3's data‑join pattern with a key function. Constraints arise when the key function may produce duplicate values, undefined, or when dealing with very large datasets that could af