is_single_even.Rd
Tests if an object is a single even number
is_single_even(x)
an R object
is_single_even(2) # TRUE
#> [1] TRUE
is_single_even(5) # FALSE
#> [1] FALSE
is_single_even(c(1.0,2)) # FALSE
#> [1] FALSE
is_single_even(-1.0) # FALSE
#> [1] FALSE
is_single_even(0) # TRUE
#> [1] TRUE
is_single_even(NA) # FALSE
#> [1] FALSE