Nothing
({ library(readr); library(dplyr); library(purrr) })
x <- map_dfr(set_names(file), .id = "path",
~ read_csv(.x, col_types = c(pickup_datetime = "c"), quote = "", trim_ws = FALSE, na = character())
)
print(x)
a <- head(x)
b <- tail(x)
c <- sample_n(x, 100)
d <- filter(x, payment_type == "UNK")
e <- group_by(x, payment_type) %>% summarise(avg_tip = mean(tip_amount))
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