Function validateParameters

trivia/code.ts:82–96

(
  parameters: ParameterValues
)

}

function validateParameters(
  parameters: ParameterValues
): TriviaParameters | null {
  const numberString = parameters.number;
  const number = validateNumber(numberString)
  if (number === null) {
    return null
  }

  const category = parameters.category;
  const difficulty = parameters.difficulty;
  const type = parameters.type;

  return { number, category, difficulty, type };
}

function validateNumber(numberString: string) {
  let number: number;