// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
/**
 * Applies the given selector to all elements of the given collection and
 * returns the min value of all elements. If an empty array is provided the
 * function will return undefined.
 *
 * @template T The type of the elements in the array.
 *
 * @param array The array to find the minimum element in.
 * @param selector The function to get the value to compare from each element.
 *
 * @returns The smallest value of the given function or undefined if there are
 * no elements.
 *
 * @example Basic usage
 * ```ts
 * import { minOf } from "@std/collections/min-of";
 * import { assertEquals } from "@std/assert/assert-equals";
 *
 * const inventory = [
 *   { name: "mustard", count: 2 },
 *   { name: "soy", count: 4 },
 *   { name: "tomato", count: 32 },
 * ];
 *
 * const minCount = minOf(inventory, (item) => item.count);
 *
 * assertEquals(minCount, 2);
 * ```
 */ export function minOf(array, selector) {
  let minimumValue;
  for (const element of array){
    const currentValue = selector(element);
    if (minimumValue === undefined || currentValue < minimumValue) {
      minimumValue = currentValue;
      continue;
    }
    if (Number.isNaN(currentValue)) {
      return currentValue;
    }
  }
  return minimumValue;
}
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