WithCollection.php
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	<?php

	namespace Keruald\OmniTools\Collections;

	use Keruald\OmniTools\Reflection\CallableElement;

	use InvalidArgumentException;
	use OutOfRangeException;

	trait WithCollection {

	abstract function count () : int;
	abstract function toArray() : array;

	public function first () : mixed {
	foreach ($this->toArray() as $item) {
	return $item;
	}

	throw new OutOfRangeException("The collection is empty.");
	}

	public function firstOr (mixed $default) : mixed {
	return match ($this->count()) {
	0 => $default,
	default => $this->first(),
	};
	}

	///
	/// HOF
	///

	/**
	* Determines if at least an element of the collection satisfies a condition.
	*
	* The execution of callbacks stop after a callable returned true.
	*
	* @param callable $callable A method returning a boolean with key and value
	* or only value as arguments.
	*
	* @return bool True if callback is true for at least one of the elements
	* @throws \ReflectionException if the callable does not exist.
	*/
	public function any (callable $callable) : bool {
	$argc = (new CallableElement($callable))->countArguments();
	$items = $this->toArray();

	foreach ($items as $key => $value) {
	$result = match($argc) {
	0 => throw new InvalidArgumentException(self::CB_ZERO_ARG),
	1 => $callable($value),
	default => $callable($key, $value),
	};

	// PHP standard or extensions functions can sometimes throw
	// mixed result, for example true or a constant. Any other
	// result than the boolean true is interpreted as falsy.
	if ($result === true) {
	return true;
	}
	}

	return false;
	}

	/**
	* Determines if all elements of the collection satisfies a condition.
	*
	* The execution of callbacks stop after a callable returned false.
	*
	* @param callable $callable A method returning a boolean with key and value
	* or only value as arguments.
	*
	* @return bool True if callback is true for all the elements
	* @throws \ReflectionException if the callable does not exist.
	*/
	public function all (callable $callable) : bool {
	$argc = (new CallableElement($callable))->countArguments();
	$items = $this->toArray();

	foreach ($items as $key => $value) {
	$result = match($argc) {
	0 => throw new InvalidArgumentException(self::CB_ZERO_ARG),
	1 => $callable($value),
	default => $callable($key, $value),
	};

	// PHP standard or extensions functions can sometimes throw
	// mixed result, for example true or a constant. Any other
	// result than the boolean true is interpreted as falsy.
	if ($result !== true) {
	return false;
	}
	}

	return true;
	}

	}

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