60 lines
1.1 KiB
PHP
60 lines
1.1 KiB
PHP
<?php declare(strict_types=1);
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/**
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* This file is part of the Phootwork package.
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*
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* @license MIT License
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* @copyright Thomas Gossmann
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*/
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namespace phootwork\collection;
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use Iterator;
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use phootwork\lang\parts\PopPart;
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/**
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* Represents a Stack
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*
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* FILO - first in last out
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*
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* @author Thomas Gossmann
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*/
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class Stack extends AbstractList {
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use PopPart;
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/**
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* Creates a new ArrayList
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*
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* @param array|Iterator $collection
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*/
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public function __construct(array|Iterator $collection = []) {
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$this->push(...$collection);
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}
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/**
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* Pushes an element onto the stack
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*
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* @param mixed ...$elements
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*
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* @return $this
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*/
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public function push(mixed ...$elements): self {
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array_push($this->array, ...$elements);
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return $this;
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}
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/**
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* Returns the element at the head or null if the stack is empty but doesn't remove that element
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*
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* @return mixed
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*/
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public function peek(): mixed {
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if ($this->size() > 0) {
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return $this->array[$this->size() - 1];
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}
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return null;
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}
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}
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