javascript random entries from an array

arrayRandom.js

const getRandomPercentageElements = (array, percentage) => {
  if (!Array.isArray(array) || array.length === 0 || typeof percentage !== 'number' || percentage < 0 || percentage > 100) {
    throw new Error('Invalid input');
  }
  const numberOfElements = Math.ceil(array.length * (percentage / 100));
  return getRandomEntriesFromArray(array, numberOfElements);
}

const getRandomEntriesFromArray = (array, numberOfElements) => {
  if (!Array.isArray(array) || array.length === 0 || typeof numberOfElements !== 'number' || numberOfElements < 0 || numberOfElements > array.length) {
    throw new Error('Invalid input');
  }
  const result = [];
  const selectedIndexes = new Set();
  while (selectedIndexes.size < numberOfElements) {
    const randomIndex = Math.floor(Math.random() * array.length);
    if (!selectedIndexes.has(randomIndex)) {
        selectedIndexes.add(randomIndex);
        result.push(array[randomIndex]);
    }
  }
  return result;
}

// if quantity is less that 1 use percent
// otherwise use a number
const randomFromArray(array, quantity) => {
  if (!Array.isArray(array) || array.length === 0 || typeof quantity !== 'number') {
    throw new Error('Invalid input');
  }
  if (quantity < 1) {
    return getRandomPercentageElements(array, quantity * 100)
  }
  return getRandomEntriesFromArray(array, quantity);
}