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Scan over 𝕩
with 𝔽
from left to right, producing intermediate values.
+` 1‿2‿3
⟨1, 1+2, (1+2)+3⟩
-` 1‿2‿3
⟨1, 1-2, (1-2)-3⟩
Monadic scan, but use 𝕨
as initial left argument.
5 +` 1‿2‿3
⟨5+1, (5+1)+2, ((5+1)+2)+3⟩
5 -` 1‿2‿3
⟨5-1, (5-1)-2, ((5-1)-2)-3⟩