So am I! Sean, can you share code for condp->> too, please.
Oh, sorry, I thought it was obvious from condp-> since the only difference is
that it uses ->> instead of -> in one place:
(defmacro condp->>
"Takes an expression and a set of predicate/form pairs. Threads expr (via ->>)
through each form for which the corresponding predicate is true of expr.
Note that, unlike cond branching, condp->> threading does not short circuit
after the first true test expression."
[expr & clauses]
(assert (even? (count clauses)))
(let [g (gensym)
pstep (fn [[pred step]] `(if (~pred ~g) (->> ~g ~step) ~g))]
`(let [~g ~expr
~@(interleave (repeat g) (map pstep (partition 2 clauses)))]
~g)))
Sean
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