Migrating from APL2 to Dyalog

[rex]

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

[Adam|Dyalog]

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)[I]←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