maxBy

/**
 * @param {Array} array The array to iterate over.
 * @param {Function} iteratee The iteratee invoked per element.
 * @returns {*} Returns the maximum value.
 */
export default function maxBy(array, iteratee) {
  if (array.length === 0) {
    return undefined;
  }

  let maxItem;
  let maxValue;

  for (const item of array) {
    const value = iteratee(item);

    // Skip undefined results
    if (value === undefined) {
      continue;
    }

    if (maxItem === undefined || value > maxValue) {
      maxItem = item;
      maxValue = value;
    }
  }

  return maxItem;
}