get the most frequent element from an array. In other words, mode of an array

mode.js

/**
 * Getting the most frequent element from an array
 */

function mode(array = []) {
  // check if it is an array and have atleast a single element
  if (!Array.isArray(array)) {
    throw new Error(`Please provide an array as argument`);
  }

  const counter = {};
  let maxElement = [];
  let maxCount = 1;

  for (const element of array) {
    if (!counter[element]) {
      counter[element] = 1;
    } else {
      counter[element]++;
    }

    if (counter[element] > maxCount) {
      maxElement = [element];
      maxCount = counter[element];
    } else if (counter[element] === maxCount) {
      maxElement.push(element);
    }
  }

  return maxElement;
}