Backport of isTRUE for R < 3.5.0 — isTRUE • backports

The implementation of `isTRUE` has been changed in R-3.5.0 from identical(x, TRUE) to is.logical(x) && length(x) == 1L && !is.na(x) && x. This backport overloads the old implementation for R versions prior to 3.5.0.

isTRUE(x)

Examples

# get function from namespace instead of possibly getting
# implementation shipped with recent R versions:
bp_isTRUE = getFromNamespace("isTRUE", "backports")

bp_isTRUE(FALSE)
#> [1] FALSE
bp_isTRUE(iris)
#> [1] FALSE