Match height of multiple elements with javascript

(function matchHeight(){
  //Grab divs with the class name 'match-height'
  var getDivs = document.getElementsByClassName('match-height');

  //Find out how my divs there are with the class 'match-height'
  var arrayLength = getDivs.length;
  var heights = [];

  //Create a loop that iterates through the getDivs variable and pushes the heights of the divs into an empty array
  for (var i = 0; i < arrayLength; i++) {
      heights.push(getDivs[i].offsetHeight);
  }

   //Find the largest of the divs
  function getHighest() {
    return Math.max(...heights);
  }

  //Set a variable equal to the tallest div
  var tallest = getHighest();

  //Iterate through getDivs and set all their height style equal to the tallest variable
  for (var i = 0; i < getDivs.length; i++) {
      getDivs[i].style.height = tallest + "px";
  }
})();