create use_first_valid_of function about janitor HOT 3 CLOSED

Like this code I just reviewed:

currentroster <- currentroster %>%
  mutate(recent_rating = ifelse(!is.na(rating2016), rating2016, 
                          ifelse(!is.na(rating2015), rating2015,
                                               rating2014)))

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Numeric, logical, character instances are easy. Is it important to retain factor class if all inputs are factors? And how should this work for dates?

Maybe allow the user to specify a class and then the empty result vector will be initialized with that type of NA? Edit: if possible, better to have the function detect the uniform class of the input vectors and do that automatically. Dates -> Dates without user specification.

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Not going to have this create a new variable indicating the source vector used for each value. That's a non-critical option, and this is clearest if it always returns a single vector.

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