JavaScript How about a higher-order function called struggle? on higher order thinking skills,on higher order derivatives,questions

What is the exact problem?

strugle(Input, Solutions) ->
  lists:any(fun(X) -> X(Input) end, Solutions).

It is Erlang essentials. Or if you wish to return first non-false value.

strugle(Input, Solutions) ->
  any_non_false(fun(X) -> X(Input) end, Solutions).

any_non_false(F, L) ->
  try lists:any(fun(X) ->
      case F(X) of
        false -> false;
        Y -> throw({return, Y})
      end
    end, L)
  catch {return, X} -> X end.
Answer:1

This sounds very much like Array.prototype.find, except that your desired return value is the first truthy value that find sees, and not the element that produced the truthy value.

You could use Array.prototype.reduce to accomplish this:

function struggle(input, solutions) {
  return solutions.reduce((ans, solution) =>
    ans !== undefined ? ans : solution(input)
  , undefined);
}

Written imperatively, this would be like:

function struggle(input, solutions) {
  for (const solution of solutions) {
    const ans = solution(input);
    if (ans !== undefined) {
      return ans;
    }
  }
  return undefined;
}

This doesn't sound like it needs to be a built-in function, because it's not general enough. There's two steps here: (1) mapping the solutions, and (2) testing if the value is acceptable. Built-in JavaScript functions tend to be extremely general purpose. More specific functions are a better fit for utility libraries.

Answer:2

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