Dyalog Forums

I wrote an article about this for Vector back in 1996.
So it's old, but I bet much of it is still relevant today.
https://www.rexswain.com/vector.pdf

From a quick read-through, it appears that many of the most severe issues have gone away over the years, or have viable work-arounds:

1. There's no need to search for ⎕NC of the left argument to selectively insert braces around the left argument; just insert braces everywhere. Any monadic use of a strictly dyadic function would VALUE ERROR upon first usage of the left argument, just as APL2 would.
2. While it is hard to identify uses of / as replicate vs reduce, a viable solution is to replace all instances with {⍺⍺/⍵} or {⍺⍺/[k]⍵} when used with an axis.
3. You should probably use the Unicode version of Dyalog, which handles ⌻ ⍂ ⍸ ∵
4. You can sink with {}
5. (1 0 1/M[;4])←0 and (A⊃B)←X work fine now.
6. ,/⍳0 now returns ⊂⍳0 just like APL2.
7. ⎕DL now handles fractional seconds.
8. (X Y)←⊂'ABC' now behaves like APL2
9. You can write your own ¨ that has APL2-like behaviour as Each←{⍺←⊢ ⋄ 0∊⍴¨⍺ ⍵ ⍵:⍺⊢¨⍵ ⋄ ⍺ ⍺⍺¨⍵} but note that it doesn't use the special fill function that corresponds to the operand.
10. Dyalog now has ⌷.
11. And n-wise reduction.
12. And scalar function axis.
13. And ⎕UCS
14. )RESET does now allow an argument