function flattenOneLevel(array: (number | number[])[]): number[] {
  let newArray: number[] = []
  for (let el of array) {
    if (typeof el == "number") {
      newArray.push(el)
    } else {
      el.forEach(n => {
        newArray.push(n)
      })
    }
  }
  return newArray;
}

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