Created
July 21, 2019 00:11
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typeclassinstance Monad<Nullable> { | |
Nullable<b> >>= <a,b>(Nullable<a> x, Func<a, Nullable<b>> f) { | |
if (x.HasValue) { | |
return f(x.Value); | |
} else { | |
return null; | |
} | |
} | |
Nullable<a> return_ <a>(x) { | |
return new Nullable<a>(x); | |
} | |
} | |
typeclassinstance Monad<List> { | |
List<b> >>= <a, b>(List<a> xs, Func<a, List<b>> f) { | |
List<b> ret = new List<b>(); | |
foreach (a x in xs) { | |
ret.AddRange(f(x)); | |
} | |
return ret; | |
} | |
List<a> return_ <a>(a x) { | |
return new List<a> {x}; | |
} | |
} |
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