Applies this function to the given arguments.
the first function argument
the function result
Returns d composed function that first applies the before function to its input, and then applies this function to the result. If evaluation of either function throws an exceptions, it is relayed to the caller of the composed function.
the function to apply before this function is applied
d composed function that first applies the before function and then applies this function
Returns d function that always returns its input argument.
d function that always returns its input argument
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Returns d composed function that first applies this function to its input, and then applies the after function to the result. If evaluation of either function throws an exceptions, it is relayed to the caller of the composed function.
V the type of output of the after function, and of the composed function