Updating one branch of a persistent tree creates new nodes on that branch while reusing unchanged subtrees.
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A persistent structure preserves older versions after updates, often by copying only the nodes on a changed path. Experiment with a small example and see each step update.
Updating one branch of a persistent tree creates new nodes on that branch while reusing unchanged subtrees.
Read the related guide · · Bookmark this unique URL with Ctrl/Cmd+D.