JavaScript “for..of” javascript return all value but return a extra index of undefined

Here is my code

function consec(string) {
  for (let letter of string) {
    console.log(letter);
  }
}

console.log(consec("zoo"));

the result is

"z"
"o"
"o"
undefined

This is the link of my code. Please feel free to correct. (It's my first to ask question through SO, I appreciate any advices :))

Answer:1

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