Dynamic function generation at runtime with Code.eval_... very slow

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5

The purpose of the program definitely matters, because there may be simpler solutions available.

When you are evaluating code at runtime, there are at a minimum 4 or 5 compiler passes involved, to build something that is then evaluated (i.e. invoked by hand and not compiled). In your case, it is not clear why you need to use eval in the first place. Couldn’t you return the function?

compiledB =  fn vars ->
  %{"my_var" => userVar_0} = vars
  [["(", to_string(userVar_0), ":", to_string(userVar_0), ")"]]
end
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