String reversal is a fundamental operation in computer science used in various applications, including text processing, cryptography, and data compression

String reversal involves reversing the order of characters in a given string. It is a simple yet essential operation with applications in many areas of computer science, ranging from basic text manipulation to advanced data processing tasks.

• Iterative Reversal: Iterate through the string and build the reversed string character by character.

// Iterative Reversal
function reverseStringIterative(str) {
    let reversed = '';
    for (let i = str.length - 1; i >= 0; i--) {
        reversed += str[i];
    }
    return reversed;
}

• Recursive Reversal: Recursively reverse substrings of the input string.

// Recursive Reversal
function reverseStringRecursive(str) {
    if (str === '') {
        return '';
    } else {
        return reverseStringRecursive(str.substr(1)) + str.charAt(0);
    }
}

• Using Built-in Functions: Utilize built-in JavaScript functions like split, reverse, and join to reverse the string efficiently.

// Using Built-in Functions
function reverseStringBuiltIn(str) {
    return str.split('').reverse().join('');
}

The time complexity of all three approaches to string reversal is O(n), where n is the length of the input string. Each character of the string is processed once during the reversal operation.