344-reverse-string.js

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