How to apply a small anonymous function defined in a yaml file?

General Usage
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Update: yes it seems that the difference was that RuntimeGeneratedFunctions.jl was caching the expressions it evaled, making it seem faster than it really was in a @btime loop.

Here’s a macrobenchmark that avoids the caching:

function bench(f, x)
    ops = ["/", "*", "+", "-"]
    vals = rand(5)
    for op1 ∈ ops, op2 ∈ ops
        for y ∈ vals, z ∈ vals
            s = "(x) -> x $op1 $y $op2 $z" 
            f(s, x)
        end
    end
end

julia> @time bench(apply_eval, 1.0)
  1.077235 seconds (449.57 k allocations: 20.770 MiB, 82.07% compilation time)

julia> @time bench(apply_rgf, 1.0)
  1.115373 seconds (976.42 k allocations: 45.832 MiB, 0.66% gc time, 97.86% compilation time)

julia> @time bench(apply_interp, 1.0)
  0.111546 seconds (138.85 k allocations: 6.111 MiB)
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