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diagnosis a tibble for character NA, NULL, all T/F column, blank in cell
dx_tb(x)
list
tibble
x <- tibble::tibble( c1 = c("NA", NA, "a", "b"), c2 = c("c", "d", "e", "NULL"), c3 = c("T", "F", "F", "T"), c4 = c("T", "F", "F", NA), c5 = c("", " ", "\t", "\n") ) dx_tb(x)
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