--description--

Write a function, named lastLetter, that takes a string as a parameter and returns the last letter of the string.

--hints--

You should have a function named lastLetter.

assert.isFunction(lastLetter);

Your function should take in a string as a parameter.

assert.match(lastLetter.toString(), /\s*lastLetter\(\s*\w+\s*\)/);

You should return the last letter of the string.

assert.strictEqual(lastLetter('Sem'), 'm');

--seed--

--seed-contents--

--solutions--

function lastLetter(str) {
  return str[str.length - 1];
}