versionComparator.js

const assert = require('node:assert');

const parseInt = (n) => Number.parseInt(n)

function versionComparator(v1, v2) {
  const v1arr = v1.split('.').map(parseInt);
  const v1arrlen = v1arr.length;
  const v2arr = v2.split('.').map(parseInt);
  const v2arrlen = v2arr.length;
  
  // preventing out of bounds
  const len = v1arrlen > v2arrlen ? v2arrlen : v1arrlen;
  
  for(let i = 0; i < len; i++) {
    if (v1arr[i] === v2arr[i]) {
      continue;
    }
    return v1arr[i] > v2arr[i] ? 1 : -1;
  }

  return 0
}

const versions = [
  ['1.0.1', '1.0.01', 0],
  ['1.0.1', '0.1.0.1.0', 1],
  ['1.0.2', '1.0.0.2', 1],
  ['2.1.0', '2.4.6.001', -1],
]

versions.forEach(([v1, v2, answer]) => {
  const result = versionComparator(v1, v2);
  console.log(v1, v2, result);
  assert.equal(result, answer)
});