R Under development (unstable) (2024-09-10 r87115 ucrt) -- "Unsuffered Consequences"
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> library(abind)
> x <- array(1:4, dim=c(2, 2), dimnames=list(X=c('a','b'), Y=c('d','e')))
> y <- array(5:8, dim=c(2, 2), dimnames=list(W=c('A','B'), Z=c('D','E')))
> # dimname names not used unless use.dnns=T
> abind(x, y)
  d e D E
A 1 3 5 7
B 2 4 6 8
> abind(x, y, along=1)
  D E
a 1 3
b 2 4
A 5 7
B 6 8
> abind(x, y, use.dnns=T)
   Z
W   d e D E
  A 1 3 5 7
  B 2 4 6 8
> abind(y, x, use.dnns=T)
   Y
X   D E d e
  a 5 7 1 3
  b 6 8 2 4
> abind(y, x, use.dnns=T, use.first.dimnames=T)
   Z
W   D E d e
  A 5 7 1 3
  B 6 8 2 4
> abind(x, y, use.dnns=T, use.first.dimnames=T)
   Y
X   d e D E
  a 1 3 5 7
  b 2 4 6 8
> abind(x, y, along=1, use.dnns=T)
   Z
W   D E
  a 1 3
  b 2 4
  A 5 7
  B 6 8
> abind(y, x, along=1, use.dnns=T)
   Y
X   d e
  A 5 7
  B 6 8
  a 1 3
  b 2 4
> abind(y, x, along=1, use.dnns=T, use.first.dimnames=T)
   Z
W   D E
  A 5 7
  B 6 8
  a 1 3
  b 2 4
> abind(x, y, along=1, use.dnns=T, use.first.dimnames=T)
   Y
X   d e
  a 1 3
  b 2 4
  A 5 7
  B 6 8
> 
> proc.time()
   user  system elapsed 
   0.10    0.06    0.17