1
var reformatNumber = function (number) {
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  let numArr = number.replace(/-/g, "").replace(/ /g, "").split("");
3
  let res = "";
4
  while (numArr.length >= 4) {
5
    numArr.length == 4
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      ? (res +=
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          numArr.splice(0, 2).join("") + "-" + numArr.splice(0, 2).join(""))
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      : (res += numArr.splice(0, 3).join("") + "-");
9
  }
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  res += numArr.join("");
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  return res;
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};