Circle Star (⍟)

𝔽⍟𝔾 𝕩, 𝕨 𝔽⍟𝔾 𝕩: Repeat

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Apply 𝔾 to 𝕨 and 𝕩, then apply 𝔽 to 𝕩 that may times. If 𝕨 is given, use it each time as a constant left argument.

If 𝔾 returns an array, give 𝔽⍟𝕩 for each of its elements.

↗️
    1 +⍟⊢ 4
8

    1 +⍟1‿2‿3 4
⟨ 5 6 7 ⟩

    3 ∾⍟{≠𝕩} ⟨4,5,6⟩
⟨ 3 3 3 4 5 6 ⟩