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"]

by Arvind Pal

JavaScript

function reverseString( s) {
   let left = 0;
   let end = s.length-1;
   while (left < end) {
      //swap
      let temp = s[left];
      s[left] = s[end];
      s[end] = temp;
      
      left ++;
      end --;
   }
}

console.log(reverseString('h', 'e', 'l', 'l', 'o'));