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map() in purrr is functionally equivalent to lapply(). If you can do something in lapply, you can do it with map.


Right, which is why my example used its cousin, apply, instead of lapply. apply over the row margins of a data frame does not have an equivalent in tidyverse.


Beware that apply() coerces data frames to matrices, which is time consuming and forces all columns to have the same type.




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