Algo friday 3 solution

startAndEnd.js

const startAndEnd = (nums, val) => {
  if (!Array.isArray(nums) || typeof val !== 'number') throw new Error('Invalid input')

  const min = Math.min(...nums);

  let positions = [-1, -1]

  let countLessThanVal = 0
  let countOfVal = 0
  let countOfMin = 0

  for (let num of nums) {
    if (num === min) countOfMin++
    if (num < val) countLessThanVal++
    if (num === val) countOfVal++
  }

  if (!countOfVal) return positions

  positions[0] = val === min ? 0 : countLessThanVal + countOfMin - 1
  positions[1] = positions[0] + countOfVal - 1

  return positions
}

Thank you.