export function getLongestPathSegmentPrefix(arr1: string[], arr2: string[]): number {
  var prefixSize = 0;
  var minLen = Math.min(arr1.length, arr2.length);
  while (prefixSize < minLen && arr1[prefixSize] == arr2[prefixSize]) {
    prefixSize++;
  }
  return prefixSize;
}

function _randomChar(): string {
  return StringWrapper.fromCharCode(97 + Math.floor(Math.random() * 25));
}

function randomNum(max) {
  return Math.floor(Math.random() * max);
}