Jul 30, 2025 · Jul 30, 2025 · Jul 30, 2025 · Jul 30, 2025 · Jul 30, 2025 · Jul 30, 2025
diff --git a/String/AlphaNumericPalindrome.js b/String/AlphaNumericPalindrome.js
Original file line number	Diff line number	Diff line change
		@@ -1,31 +1,33 @@
		/**
		* @function alphaNumericPalindrome
	* @description alphaNumericPalindrome should return true if the string has alphanumeric characters that are palindrome irrespective of special characters and the letter case.
	* @description alphaNumericPalindrome should return true if the string has alphanumeric characters that form a palindrome,
	* regardless of special characters and letter case.
		* @param {string} str the string to check
		* @returns {boolean}
		* @see [Palindrome](https://en.wikipedia.org/wiki/Palindrome)
		* @example
		* The function alphaNumericPalindrome() receives a string with varying formats
	* like "racecar", "RaceCar", and "race CAR"
	* like "racecar", "RaceCar", and "race CAR".
		* The string can also have special characters
	* like "2A33a2", "2A3 3a2", and "2_A33#A2"
	* like "2A33a2", "2A3 3a2", and "2_A33#A2".
		*
		* But the catch is, we have to check only if the alphanumeric characters
	* are palindrome i.e remove spaces, symbols, punctuations etc
	* and the case of the characters doesn't matter
	* form a palindrome, i.e., remove spaces, symbols, punctuation, etc.
	* The case of the characters doesn't matter.
		*/
		const alphaNumericPalindrome = (str) => {
		if (typeof str !== 'string') {
		throw new TypeError('Argument should be string')
		}

	// removing all the special characters and turning everything to lowercase
	// Remove all non-alphanumeric characters and convert to lowercase
		const newStr = str.replace(/[^a-z0-9]+/gi, '').toLowerCase()

		const midIndex = newStr.length >> 1 // x >> y = floor(x / 2^y)

		for (let i = 0; i < midIndex; i++) {
		if (newStr.at(i) !== newStr.at(~i)) {
	// ~n = -(n + 1)
	// ~n = -(n + 1), used to get characters from the end
		return false
		}
		}
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