function getRandomArrayElements (array, count, startIndex, endIndex) {
  if (Array.isArray(array) === false) throw new Error('Invalid array object')
  if (startIndex < 0 || startIndex > array.length - 1) throw new Error('Invalid startIndex value')
  if (endIndex < 0 || endIndex > array.length - 1) throw new Error('Invalid endIndex value')
  if (count < startIndex || count > (endIndex - startIndex)   1) throw new Error('Invalid count value')
  var resultList = []
  var temp, randomIndex
  while (count > 0) {
    randomIndex = chooseRandomNumer(startIndex, endIndex)
    temp = array[randomIndex]
    array[randomIndex] = array[endIndex]
    array[endIndex] = temp
    resultList.push(temp)
    count--
    endIndex--
  }
  return resultList
}