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<?php |
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namespace Ianriizky\CodingInterview\Palindrome; |
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class Palindrome |
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{ |
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/** |
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* Create a new instance class. |
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* |
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* @param string $value |
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* @return void |
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*/ |
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public function __construct( |
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protected string $value |
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) { |
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$this->value = $this->sanitize($value); |
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} |
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/** |
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* Create a new instance class in a static way. |
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* |
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* @param string $value |
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* @return static |
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*/ |
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public static function make(string $value) |
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{ |
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return new static($value); |
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} |
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/** |
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* Determine whether the given value is a palindrome or not using reverse way. |
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* |
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* @return bool |
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*/ |
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public function checkUsingReverse(): bool |
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{ |
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$value = $this->value; |
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$newValue = ''; |
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for ($index = strlen($value) - 1; $index >= 0; $index--) { |
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$newValue .= $value[$index]; |
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} |
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return $value === $newValue; |
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} |
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/** |
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* Determine whether the given value is a palindrome or not using loop way. |
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* |
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* @return bool |
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*/ |
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public function checkUsingLoop(): bool |
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{ |
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$value = $this->value; |
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for ($index = 0; $index < floor(strlen($value) / 2); $index++) { |
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$lastCharacterIndex = strlen($value) - ($index + 1); |
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$firstCharacter = $value[$index]; |
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$lastCharacter = $value[$lastCharacterIndex]; |
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if ($firstCharacter !== $lastCharacter) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* Determine whether the given value is a palindrome or not using recursive way. |
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* |
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* @param int $index |
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* @return bool |
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*/ |
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public function checkUsingRecursive(int $index = 0): bool |
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{ |
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$value = $this->value; |
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if ($index < floor(strlen($value) / 2)) { |
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$lastCharacterIndex = strlen($value) - ($index + 1); |
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$firstCharacter = $value[$index]; |
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$lastCharacter = $value[$lastCharacterIndex]; |
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if ($firstCharacter !== $lastCharacter) { |
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return false; |
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} |
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return $this->checkUsingRecursive($index + 1); |
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} |
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return true; |
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} |
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/** |
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* Sanitize the given value by running some specific task. |
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* |
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* @return string |
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*/ |
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protected function sanitize(string $value): string |
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{ |
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$value = str_replace(' ', '', $value); |
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$value = str_replace('-', '', $value); |
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$value = preg_replace('/[^A-Za-z0-9\-]/', '', $value); |
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$value = mb_strtolower($value, 'UTF-8'); |
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return $value; |
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} |
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} |
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ianriizky /
coding-interview
