Converts the given string into code with metaprogramming

[F-YF]

@GunnarFarneback

julia> function foo(s, x)
           f = eval(Meta.parse("x -> $s"))
           return Base.invokelatest(f, x)
       end
foo (generic function with 1 method)

julia> foo("2x+1", 3)
7

It was very helpful to me, thank you so much!