Javascript Ternary Operator I need to make a code Help me plss [closed]

Hey i need to make a code That ask the user for his postal code. And if the Postal code is even to: 1010ST There should appear a alert pop-up With the next input: 'Kans op de Nationale Postcode Loterij is 90%' And if its not even to 1010ST there should appear this input: 'Kans op de Nationale Postcode Loterij is 0,969%'