http://snipplr.com/users/jarnaldich/tags/alist Recent snippets posted on Snipplr.com en-us Tue, 14 Oct 2008 00:27:53 GMT http://snipplr.com/view/6067/grouping-keys-of-an-associative-list/ Given an an associative list ((k1 . v1) (k2 . v2) ... (kn . vn)), with possibly equal values for ki, it returns another alist where all cells have distinct keys and where values originally associated to the same key have been grouped as a list in the new cons cell. Ouch! This is much harder to explain than to code. Just check the commented example in the code.

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