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Example: This may produce an error if listNumbers is undefined.
const showPrimeFactors = (listNumbers) => {
  listNumbers.map((number) => {
    console.log(primeFactors(number));
  })
}Suggestion by DeepCode
Solution: Change map by for-of
const showPrimeFactors = (listNumbers) => {
  for (const number of listNumbers) {
    console.log(primeFactors(number));
  }
}

