The full definition of ⍨ can be written as {⍺←⍵ ⋄ ⍵(⍺⍺⊣⊢)⍺}
The functionality given by (⍺⍺⊣⊢) which means an array can represent its constant function, appears a few places, and would have been nice to support even more places. Examples of existing support are A@ and (A g h) and examples of would-have-been-nices are ⍣A and ⍤A
Wikipedia on naming conventions in programming states (without source):
In APL dialects, the delta (Δ) is used between words, e.g. PERFΔSQUARE (…)
This is an unusual choice, but I notice that ECMA-17 says:
(…) in certain applications there is a need for a graphical representation of the contro...
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Wikipedia on naming conventions in programming states (without source):
In APL dialects, the delta (Δ) is used between words, e.g. PERFΔSQUARE (…)
This is an unusual choice, but I notice that ECMA-17 says:
(…) in certain applications there is a need for a graphical representation of the contro...
