Javascript Algorithm String Count Word

function wordCount(sentence) {
  // period with nothing so it doesn't count as word
  var wordsArray = sentence.replace(/[.]/g, "").split(" "),
      occurenceList = {},/*from   w ww  . j a  va  2  s  .  c  o  m*/
      answerList = {};

  for (var i = 0, wordsLength = wordsArray.length; i < wordsLength; i++) {
      var currentWord = wordsArray[i];
      if (!occurenceList[currentWord]) { // doesn't exist, set as 1st occurrence
          occurenceList[currentWord] = 1;
      } else {
          occurenceList[currentWord]++; // add occurrences
      }
  }

  var arrayTemp = [];
  // push the value and key as fixed array
  for (var prop in occurenceList) {
      arrayTemp.push([occurenceList[prop], prop]);
  }

  function sortcomp(a, b) {
      return b[0] - a[0]; // compare the first element of the array
  }

  arrayTemp.sort(sortcomp); //sort

  for (var i = 0, arrlength = arrayTemp.length; i < arrlength; i++) {
      var current = arrayTemp[i];
      answerList[current[1]] = current[0]; // key value pairs
  }
  return answerList;
}
let a = wordCount("this is a test is a test test test test test");
console.log(a);