Get latest version from array of versions formatted like so: x.x.x

getLatest.js

function getLatest(arr) {
  if (arr.length === 0) {
    return null;
  }
  if (arr.length === 1) {
    return arr[0];
  }
  const newArr = arr.map(item => {
    return parseInt(item.split(".").join(""));
  });
  const max = Math.max.apply(Math, newArr);
  return max.toString().split("").join(".");
}

getLatest(["1.0.1","1.0.2","1.0.3","4.9.8","1.0.5","1.6.2"])