Access array elements from string argument in Modelica

StackoverflowArray.mo

package StackoverflowArray
  record Dictionary "key value pair"
    parameter String name "Unique name key";
    parameter Real[:] c "coefficients";
  end Dictionary;

  function getIdx
    input String key="B";
    input Dictionary[2] dict={Dictionary(name="A", c={1,2,3}), Dictionary(name="B", c={4,5,6,7})};
    output Integer idx;
  protected 
    Boolean[:] b;
  algorithm 
    b := {kv.name == key for kv in dict};
    idx := Modelica.Math.BooleanVectors.firstTrueIndex(b);
  end getIdx;

  annotation (uses(Modelica(version="3.2.1")));
end StackoverflowArray;