nchar() applied to an element with value NA

[komwomak]

The text at the start of section 7.1 and the example do not appear to agree on what nchar() does on encountering NA:

text <- c("one", "two", "three", NA, "five")
nchar(text)
[1] 3 3 5 NA 4

Thank you for making this material available!

[Ax3man]

It used to be true, but is no longer. This behavior changed around R 3.2.0 and is controlled by the keepNA parameter.