CPW2: Contagem de Letras Únicas

HTML

<!DOCTYPE html>
<html>
<head>
  <title>Exercício</title>
  <link rel="stylesheet" href="https://code.jquery.com/qunit/qunit-2.20.1.css">
</head>
<body>
  <!-- NÃO ALTERAR --> 
  <div id="qunit"></div>
  <div id="qunit-fixture"></div>
  <script src="https://code.jquery.com/qunit/qunit-2.20.1.js">
  </script>
</body>
</html>

JavaScript

//  Escreva uma função em JavaScript que conte quantas letras únicas estão presentes em uma string. Por exemplo, a string "banana" contém 3 letras ou a string "paralelepípedo" contém 7 letras únicas.
function main(palavra) {
   // O seu código deve ser implementado abaixo
   
   
   //
}
 
 // ******** TESTES - NÃO ALTEAR ********
 QUnit.module('var', hooks => {
  QUnit.test('Concatenação', assert => {
    assert.equal(main("banana"), 3);
  });
  QUnit.test('Concatenação', assert => {
    assert.equal(main("paralelepípedo"), 7);
  });
});

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CPW2: Contagem de Letras Únicas

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