R Under development (unstable) (2023-11-07 r85491 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  s i z e . R  tests
> ##
> 
> size <- pracma::size
> numel <- pracma::numel
> ndims <- pracma::ndims
> isempty <- pracma::isempty
> 
> identical(size(1:8), c(1, 8))
[1] TRUE
> identical(size(1:8, 1), 1)
[1] TRUE
> identical(size(1:8, 2), 8)
[1] TRUE
> identical(size(1:8, 3), 1)
[1] TRUE
> identical(size(matrix(1:12, 3, 4)), c(3L, 4L))
[1] TRUE
> 
> identical(numel(array(0, c(4,4,2))), 32)
[1] TRUE
> identical(numel(1:100), 100)
[1] TRUE
> 
> identical(ndims(array(NA, c(4,4,2))), 3L)
[1] TRUE
> identical(ndims(list(a=1:5)), 2L)
[1] FALSE
> 
> identical(isempty(numeric(0)), TRUE)
[1] TRUE
> identical(isempty(matrix(0, 1, 0)), TRUE)
[1] TRUE
> identical(isempty(matrix(0, 1, 1)), FALSE)
[1] TRUE
> identical(isempty(array(NA, c(2,2,2))), FALSE)
[1] TRUE
> identical(isempty(array(NA, c(2,0,2))), TRUE)
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.10    0.04    0.15