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clojure.data

Available since 1.3
  • (diff a b)
Recursively compares a and b, returning a tuple of
[things-only-in-a things-only-in-b things-in-both].
Comparison rules:
 * For equal a and b, return [nil nil a].
* Maps are subdiffed where keys match and values differ.
* Sets are never subdiffed.
* All sequential things are treated as associative collections
  by their indexes, with results returned as vectors.
* Everything else (including strings!) is treated as
  an atom and compared for equality.