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++) {

//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";

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