// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
/**
 * Returns the first element that is the largest value of the given function or
 * undefined if there are no elements.
 *
 * @template T The type of the elements in the array.
 *
 * @param array The array to find the maximum element in.
 * @param selector The function to get the value to compare from each element.
 *
 * @returns The first element that is the largest value of the given function or
 * undefined if there are no elements.
 *
 * @example Basic usage
 * ```ts
 * import { maxBy } from "@std/collections/max-by";
 * import { assertEquals } from "@std/assert/assert-equals";
 *
 * const people = [
 *   { name: "Anna", age: 34 },
 *   { name: "Kim", age: 42 },
 *   { name: "John", age: 23 },
 * ];
 *
 * const personWithMaxAge = maxBy(people, (person) => person.age);
 *
 * assertEquals(personWithMaxAge, { name: "Kim", age: 42 });
 * ```
 */ export function maxBy(array, selector) {
  let max;
  let maxValue;
  for (const current of array){
    const currentValue = selector(current);
    if (maxValue === undefined || currentValue > maxValue) {
      max = current;
      maxValue = currentValue;
    }
  }
  return max;
}
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