Reverse a String

function reverseString(s) {
  return s.split('').reverse().join('');
}
                  

Explanation: We split the string into characters, reverse the array, and then join it back into a string.

⏱ O(n) | 💾 O(n)

class Solution {
  public String reverseString(String s) {
    return new StringBuilder(s).reverse().toString();
  }
}
                  

Explanation: StringBuilder provides a built-in reverse method which efficiently reverses the string.

⏱ O(n) | 💾 O(n)

def reverse_string(s):
    return s[::-1]
                  

Explanation: Python slicing with a step of -1 returns the reversed string.

⏱ O(n) | 💾 O(n)