js search middle number algorithm code example

Example: binaryserachindex javascript

function binarySearchIndex (array, target, low = 0, high = array.length - 1) {
  if (low > high) {
    return -1
  }
  const midPoint = Math.floor((low + high) / 2)

  if (target < array[midPoint]) {
    return binarySearchIndex(array, target, low, midPoint - 1)
  } else if (target > array[midPoint]) {
    return binarySearchIndex(array, target, midPoint + 1, high)
  } else {
    return midPoint
  }
}