FR: verb to apply a function N times

[BeastyBlacksmith]

There are different ways to express "apply function foo N times to x"

julia> using BenchmarkTools
julia> N = 10; x = 1; foo(x) = x + 1;
julia> @btime foldl(|>, Iterators.repeated($foo, $N), init=$x)
  0.988 ns (0 allocations: 0 bytes)
11

julia> @btime ∘(fill($foo,$N)...)($x)
  6.034 μs (1 allocation: 80 bytes)
11

julia> @btime reduce(∘,repeat([$foo],$N))($x)
  1.811 μs (2 allocations: 160 bytes)
11

julia> @btime reduce(∘,Iterators.repeated($foo,$N))($x)
  2.182 μs (0 allocations: 0 bytes)
11

(collected from slack thread)
I think those are hard to remember and having an allocation free fast implementation in Base would be a good idea in my opinion.

The only names that come to my mind are:

• apply(foo, N, x)
• fold(foo, N)(x) (though having foldr, foldl and fold is probably too much)

[fredrikekre]

#39042