function intersection(firstArray: number[], secondArray: number[]): number[] {
 
  const output = []
  let secondNumArray = [...secondArray]
  

  firstArray.forEach((num) => {
    const foundIndex = secondNumArray.findIndex((secondNum)=> secondNum === num);

    if ( foundIndex >= 0) {
      secondNumArray.splice(foundIndex,1)
      output.push(num);
    }
  })

  return output;
}

// No modificar: necesario para evaluar el resultado.
export { intersection };