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luxbock/map-left.clj Secret

Created July 15, 2016 12:14
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map-left.clj
(defn map-left
[f e]
(if (e/right? e)
e
(e/left (f (m/extract e)))))
(map-left #(assoc % :a a)
(with-monad e/context
(mlet [foo (compute-foo a b)
bar (compute-bar foo c)]
(m/return (foobar foo bar)))))
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