Leet Code 344: Reverse String

Problem statement:

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.

Constraints:

• 1 <= s.length <= 105
• s[i] is a printable ascii character.

Soultion:

Copy
/**
 * @param {character[]} s
 * @return {void} Do not return anything, modify s in-place instead.
 */
var reverseString = function(s) {
  let r = s.length -1;
  let l = 0;
  while (l<r) {
      let temp = s[l];
      s[l] = s[r];
      s[r] = temp;
      l++;
      r--;
  }
};