miniapl

∘ — Compose / Bind

f∘g Y is f(g Y).

-∘× ¯3             ⍝ 1

X f∘g Y is X f(g Y).

10+∘-3             ⍝ 7

A∘f binds the left argument; f∘A binds the right. Bound functions are monadic.

(10∘-)3            ⍝ 7
(-∘10)3            ⍝ ¯7

See Atop / Rank and Over.

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