[알고리즘] 344. Reverse String

문제

Write a function that reverses a string. The input string is given as an array of characters char[].
Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
You may assume all the characters consist of printable ascii characters.

구현

// reverse를 사용하지 않는 방법
var reverseString = function(s) {
  let left = 0;
  let right = s.length-1;

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

return s;
};

// reverse를 활용한 방법
var reverseString = function(s) {
    return s.reverse();
};