How to call a function from another function without constructor in React native?

I need to call from my function "RegisterTaster" to my function "endRegisterAlert" but actually im not using constructor because i use the class like a const in react native.

How can i call the function ?

const Validator=(props)=>{

  async function RegisterTaster(){
    //do something...
    endRegisterAlert();
  }

  function endRegisterAlert(){
   //do something
  }

 return(
    <Button onPress={async ()=> await RegisterTaster() }> 
                    <Text >Register</Text> 
    </Button
  );
 }

export default Validator;

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