samples/check_nashorn.js

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// check if script is being run using nashorn script engine
function isNashorn() {
  try {
    // "engine" variable is of type javax.script.ScriptEngine is defined
    // by nashorn jsr-223 engine. Check the name of the engine from
    // javax.script.ScriptEngineFactory associated
    
    return engine.factory.engineName.contains("Nashorn");
  } catch (e) {
    // if engine or any of the properties are undefined
    // then script is not being run using nashorn.
    return false;
  }
}