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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Returns the first element that is the smallest value of the given function or * undefined if there are no elements * * @example * ```ts * import { minBy } from "https://deno.land/std@$STD_VERSION/collections/min_by.ts"; * import { assertEquals } from "https://deno.land/std@$STD_VERSION/assert/assert_equals.ts"; * * const people = [ *   { name: "Anna", age: 34 }, *   { name: "Kim", age: 42 }, *   { name: "John", age: 23 }, * ]; * * const personWithMinAge = minBy(people, (i) => i.age); * * assertEquals(personWithMinAge, { name: "John", age: 23 }); * ``` */export function minBy<T>(  array: Iterable<T>,  selector: (el: T) => number,): T | undefined;/** * Returns the first element that is the smallest value of the given function or * undefined if there are no elements * * @example * ```ts * import { minBy } from "https://deno.land/std@$STD_VERSION/collections/min_by.ts"; * * const people = [ *   { name: "Anna" }, *   { name: "Kim" }, *   { name: "John" }, * ]; * * const personWithMinName = minBy(people, (i) => i.name); * ``` */export function minBy<T>(  array: Iterable<T>,  selector: (el: T) => string,): T | undefined;/** * Returns the first element that is the smallest value of the given function or * undefined if there are no elements * * @example * ```ts * import { minBy } from "https://deno.land/std@$STD_VERSION/collections/min_by.ts"; * import { assertEquals } from "https://deno.land/std@$STD_VERSION/assert/assert_equals.ts"; * * const people = [ *   { name: "Anna", age: 34n }, *   { name: "Kim", age: 42n }, *   { name: "John", age: 23n }, * ]; * * const personWithMinAge = minBy(people, (i) => i.age); * * assertEquals(personWithMinAge, { name: "John", age: 23n }); * ``` */export function minBy<T>(  array: Iterable<T>,  selector: (el: T) => bigint,): T | undefined;/** * Returns the first element that is the smallest value of the given function or * undefined if there are no elements * * @example * ```ts * import { minBy } from "https://deno.land/std@$STD_VERSION/collections/min_by.ts"; * * const people = [ *   { name: "Anna", startedAt: new Date("2020-01-01") }, *   { name: "Kim", startedAt: new Date("2020-03-01") }, *   { name: "John", startedAt: new Date("2019-01-01") }, * ]; * * const personWithMinStartedAt = minBy(people, (i) => i.startedAt); * ``` */export function minBy<T>(  array: Iterable<T>,  selector: (el: T) => Date,): T | undefined;export function minBy<T>(  array: Iterable<T>,  selector:    | ((el: T) => number)    | ((el: T) => string)    | ((el: T) => bigint)    | ((el: T) => Date),): T | undefined {  let min: T | undefined = undefined;  let minValue: ReturnType<typeof selector> | undefined = undefined;
  for (const current of array) {    const currentValue = selector(current);
    if (minValue === undefined || currentValue < minValue) {      min = current;      minValue = currentValue;    }  }
  return min;}