This is a function that checks if a file exists (the (file specified in the
filename argument)) -
throws an error if it does not - and then silently uses read_csv from the readr-package to read the csv-file
into the current environment.
@param filename A character string giving the file the function will read into R
@return This function returns a data frame (a tibble) representing the data in the csv-file
@importFrom readr read_csv @importFrom dplyr tbl_df
@examples write.csv("testdata.csv", data.frame(x = seq(1,10, 1), y = seq(1,10, 1), stringsAsFactors = F)) fars_read("testdata.csv")
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