Web Reference: Learn about data structures that always preserve the previous version of themselves when they are modified. Compare different techniques for creating and accessing persistent data structures, such as copy-on-write, fat node, path copying and combination. Jul 23, 2025 · A persistent data structure is a data structure that always preserves the previous version of itself when it is modified. They can be considered as ‘immutable’ as updates are not in-place. Partial persistence lets you make modifications only to the present data structure but allows queries of any previous version. These previous versions might be accessed via a timestamp. Full persistence lets you make queries and modifications to all previous versions of the data structure.
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