344. Reverse String

Write a function that reverses a string. The input string is given as an array of characters s.

You must do this by modifying the input array in-place with O(1) extra memory.

Example 1:

Input: s = ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]

Example 2:

Input: s = ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]

Constraints:

• 1 <= s.length <= 10^5
• s[i] is a printable ascii character.

/**
 Do not return anything, modify s in-place instead.
 */
function reverseString(s: string[]): void {
  let left = 0;
  let right = s.length - 1;

  while (left < right) {
    let temp = s[left];
    s[left] = s[right];
    s[right] = temp;
    left++;
    right--;
  }
}