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Viewing File: /home/optimaldigitaltr/public_html/src/vendor/nette/utils/src/Utils/Iterables.php

<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Utils;

use Nette;


/**
 * Utilities for iterables.
 */
final class Iterables
{
	use Nette\StaticClass;

	/**
	 * Tests for the presence of value.
	 */
	public static function contains(iterable $iterable, mixed $value): bool
	{
		foreach ($iterable as $v) {
			if ($v === $value) {
				return true;
			}
		}
		return false;
	}


	/**
	 * Tests for the presence of key.
	 */
	public static function containsKey(iterable $iterable, mixed $key): bool
	{
		foreach ($iterable as $k => $v) {
			if ($k === $key) {
				return true;
			}
		}
		return false;
	}


	/**
	 * Returns the first item (matching the specified predicate if given). If there is no such item, it returns result of invoking $else or null.
	 * The $predicate has the signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
	 * @template T
	 * @param  iterable<T>  $iterable
	 * @return ?T
	 */
	public static function first(iterable $iterable, ?callable $predicate = null, ?callable $else = null): mixed
	{
		foreach ($iterable as $k => $v) {
			if (!$predicate || $predicate($v, $k, $iterable)) {
				return $v;
			}
		}
		return $else ? $else() : null;
	}


	/**
	 * Returns the key of first item (matching the specified predicate if given). If there is no such item, it returns result of invoking $else or null.
	 * The $predicate has the signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
	 * @template T
	 * @param  iterable<T, mixed>  $iterable
	 * @return ?T
	 */
	public static function firstKey(iterable $iterable, ?callable $predicate = null, ?callable $else = null): mixed
	{
		foreach ($iterable as $k => $v) {
			if (!$predicate || $predicate($v, $k, $iterable)) {
				return $k;
			}
		}
		return $else ? $else() : null;
	}


	/**
	 * Tests whether at least one element in the iterator passes the test implemented by the
	 * provided callback with signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
	 * @template K
	 * @template V
	 * @param  iterable<K, V> $iterable
	 * @param  callable(V, K, iterable<K, V>): bool  $predicate
	 */
	public static function some(iterable $iterable, callable $predicate): bool
	{
		foreach ($iterable as $k => $v) {
			if ($predicate($v, $k, $iterable)) {
				return true;
			}
		}
		return false;
	}


	/**
	 * Tests whether all elements in the iterator pass the test implemented by the provided function,
	 * which has the signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
	 * @template K
	 * @template V
	 * @param  iterable<K, V> $iterable
	 * @param  callable(V, K, iterable<K, V>): bool  $predicate
	 */
	public static function every(iterable $iterable, callable $predicate): bool
	{
		foreach ($iterable as $k => $v) {
			if (!$predicate($v, $k, $iterable)) {
				return false;
			}
		}
		return true;
	}


	/**
	 * Iterator that filters elements according to a given $predicate. Maintains original keys.
	 * The callback has the signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
	 * @template K
	 * @template V
	 * @param  iterable<K, V> $iterable
	 * @param  callable(V, K, iterable<K, V>): bool $predicate
	 * @return \Generator<K, V>
	 */
	public static function filter(iterable $iterable, callable $predicate): \Generator
	{
		foreach ($iterable as $k => $v) {
			if ($predicate($v, $k, $iterable)) {
				yield $k => $v;
			}
		}
	}


	/**
	 * Iterator that transforms values by calling $transformer. Maintains original keys.
	 * The callback has the signature `function (mixed $value, mixed $key, iterable $iterable): bool`.
	 * @template K
	 * @template V
	 * @template R
	 * @param  iterable<K, V> $iterable
	 * @param  callable(V, K, iterable<K, V>): R $transformer
	 * @return \Generator<K, R>
	 */
	public static function map(iterable $iterable, callable $transformer): \Generator
	{
		foreach ($iterable as $k => $v) {
			yield $k => $transformer($v, $k, $iterable);
		}
	}
}
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