Monads/Writer monad: Difference between revisions
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// DERIVE LOGGING VERSIONS OF EACH FUNCTION |
// DERIVE LOGGING VERSIONS OF EACH FUNCTION |
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function loggingVersion(f, strLog) { |
function loggingVersion(f, strLog) { |
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return function (v) { |
return function (v) { |
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// to the contents of a wrapped value |
// to the contents of a wrapped value |
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// and return a wrapped result (with extended log) |
// and return a wrapped result (with extended log) |
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// Writer a -> (a -> Writer b) -> Writer b |
// Writer a -> (a -> Writer b) -> Writer b |
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function writerBind(w, f) { |
function writerBind(w, f) { |
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var half_of_addOne_of_root = function (v) { |
var half_of_addOne_of_root = function (v) { |
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return logCompose([log_half, log_addOne, log_root],v); |
return logCompose([log_half, log_addOne, log_root], v); |
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}; |
}; |
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