Here's my take:
(defn mmap [f coll]
(->> coll
(partition 2)
(map (fn [[x y]] (f x y)))))
For instance:
user> (mmap + (range 8))
(1 5 9 13)
user> (mmap * (range 8))
(0 6 20 42)
You probably want to think about whether you'll see input sequences
with an odd number of terms, and how best to handle them.
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