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# returnA :: x -> CB x | |
returnA = (x) -> (callback) -> callback null, x | |
# bindA :: CB x -> (x -> CB y) -> CB y | |
bindA = (f, g) -> | |
(callback) -> | |
(err, fx) <- f! | |
if !!err | |
callback err, null | |
else | |
g fx, callback | |
# Left to right Kleisli composition | |
# kcompA :: (x -> CB y) -> (y -> CB z) -> (x -> CB z) | |
kcompA = (f, g) -> | |
(x, callback) -> | |
(err, fx) <- f x | |
if !!err then | |
callback err, null | |
else | |
g fx, callback | |
# returnE :: x -> E x | |
returnE = (x) -> [null, x] | |
# bindE :: E x -> (x -> E y) -> E y | |
bindE = ([errf, fx], g) -> | |
if !!errf then [errf, null] else g fx | |
# Left to right Kleisli composition | |
# kcompE :: (x -> E y) -> (y -> E z) -> (x -> E z) | |
kcompE = (f, g) -> | |
(x) -> | |
[errf, fx] = f x | |
if !!errf | |
[errf, null] | |
else | |
g fx | |
# transformAE :: CB x -> (x -> E y) -> CB y | |
transformAE = (f, g) -> | |
(callback) -> | |
(errf, fx) <- f! | |
if !!errf | |
callback errf, null | |
else | |
[errg, gfx] = g fx | |
if !!errg | |
callback errg, null | |
else | |
callback null, gfx | |
# transformEA :: E x -> (x -> CB y) -> CB y | |
transformEA = ([errf, fx], g) -> | |
(callback) -> | |
if !!errf | |
callback errf, null | |
else | |
g fx, callback | |
exports = exports or this | |
exports.returnA = returnA | |
exports.bindA = bindA | |
exports.kcompA = kcompA | |
exports.returnE = returnE | |
exports.bindE = bindE | |
exports.kcompE = kcompE | |
exports.transformAE = transformAE | |
exports.transformEA = transformEA |
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{returnA, returnE, bindA, bindE, kcompA, kcompE, transformAE, transformEA} = require \./compositions | |
add1A = (x, callback) -> | |
setTimeout -> | |
callback null, x+1 | |
, 100 | |
mult2A = (x, callback) -> | |
setTimeout -> | |
callback null, x*2 | |
, 100 | |
divE = (y, x) --> | |
if x == 0 then ['Div by Zero', null] else [null, y/x] | |
logA = (err, x) !-> console.log err, x | |
logE = ([err, x]) !-> console.log err, x | |
# test E | |
logE <| (returnE 4) `bindE` (divE 100) | |
# test A | |
h = add1A `kcompA` mult2A | |
(returnA 100) `bindA` h <| logA | |
(returnA 10) `bindA` add1A `bindA` mult2A <| logA | |
# test transformAE | |
(returnA 3) `bindA` add1A `transformAE` (divE 4) `bindA` mult2A <| logA | |
h = (returnA -1) `bindA` add1A `transformAE` (divE 4) `bindA` mult2A | |
h logA | |
# test transformEA | |
(returnE 4) `bindE` (divE 16) `transformEA` mult2A `bindA` add1A <| logA |
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