Monads/Writer monad: Difference between revisions
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// Define a function to create writer monads from the simple functions |
// Define a function to create writer monads from the simple functions |
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auto |
auto MakeWriter = [](auto f, string message) |
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{ |
{ |
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return [=](double x){return LoggingMonad(f(x), message);}; |
return [=](double x){return LoggingMonad(f(x), message);}; |
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// Derive writer versions of the simple functions |
// Derive writer versions of the simple functions |
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auto writerRoot = |
auto writerRoot = MakeWriter(Root, "Taking square root"); |
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auto writerAddOne = |
auto writerAddOne = MakeWriter(AddOne, "Adding 1"); |
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auto writerHalf = |
auto writerHalf = MakeWriter(Half, "Dividing by 2"); |
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Result: 1.61803 |
Result: 1.61803 |
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</pre> |
</pre> |
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=={{header|EchoLisp}}== |
=={{header|EchoLisp}}== |
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