For examining adjacent items in a sequence, there are a few functional
(i.e., no mutable state) approaches.
When the output is a sequence with an element for each adjacent pair:
(map (fn [a b] ...) s (next s))
When the output is a sequence with an element for each adjacent pair that
meets some criterion:
(remove #{::removeme}
(map
(fn [a b]
(if (criterion a b)
(foo a b)
::removeme))
s (next s)))
OR
(for [[a b] (map vector s (next s))
:when criterion]
foo a b)
When the output is a single accumulated value:
(reduce foo (map vector s (next s)))
OR
(reduce foo (partition 2 1 s))
When the output is an accumulated value, with short-circuit when some pair
meets some criterion:
(reduce foo (take-while not-criterion (map vector s (next s))))
(criterion in that case takes a single parameter to destructure into two,
e.g. (fn [[a b]] ...) rather than (fn [a b] ...).)
When the output is a seq that should short-circuit when some pair meets
some criterion:
(map foo
(take-while not-criterion
(map vector s (next s)))
OR
(for [[a b] (map vector s (next s))
:while not-criterion]
(foo a b))
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