is.flag(NA) returns TRUE

[joethorley]

is.count(NA) returns FALSE is.number(NA) returns FALSE is.string(NA) returns FALSE

but is.flag(NA) returns TRUE

this seems inconsistent to me and is annoying because it then requires use of noNA()

Example code

is.flag(NA) is.count(NA) is.number(NA) is.string(NA)

on version 0.1

[hadley]

That's because NA is logical: cf. NA_character_, NA_real_, NA_integer_.

[joethorley]

I didn't know that!

However I would still like a function that confirms a variable has the value TRUE or FALSE versus any other possible value.

Is it possible to add such a function to assert_that?

Say something like:

is.indicator is.TF

[hadley]

What about is.flag(x, naok = FALSE) ? Or is.flag(x, nona = TRUE)

[joethorley]

Sweet!

My vote is for is.flag(x, nona = TRUE) (for consistency with noNA)