gistfile1.txt

function openMine () {
  let diamonds = 21

  function dig (getDug: (remaining: number) => number) {
    const dug = getDug(diamonds)
    diamonds -= dug
    console.log('diamonds', diamonds)
    return dug
  }

  return dig
}

const digNorth = openMine()
const digSouth = openMine()

function getOne () {
  return 1
}
function getTwo () {
  return 2
}
function getHalf (remaining: number) {
  return remaining / 2
}

digNorth(getOne) // diamonds 20
digSouth(getTwo) // diamonds 19
const dugNorth = digNorth(getHalf)
const dugSouth = digSouth(getHalf)
console.log('dugNorth', dugNorth)
console.log('dugSouth', dugSouth)