prpr.cats.writer — employeerepublic/promisespromises 2.5.0.1

listen clj/s

(listen mv)

(listen ctx mv)

MonadWriter clj/s≠ protocol

A specific case of Monad abstraction that allows emulate write operations in pure functional way.

A great example is writing a log message.

-listen clj/s

(-listen m mv)

Given a writer, yield a (value, log) pair as a value.

-pass clj/s

(-pass m mv)

Given a writer whose value is a pair with a function as its second element, yield a writer which has the first element of the pair as the value and the result of applying the aforementioned function to the log as the new log.

-tell clj/s

(-tell m v)

Add the given value to the log.

pass clj/s

(pass mv)

(pass ctx mv)

tell clj/s

(tell v)

(tell ctx v)