reverseWords.js

/**
Given an input string s, reverse the order of the words.
A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space.
Return a string of the words in reverse order concatenated by a single space.

Note that s may contain leading or trailing spaces or multiple spaces between two words. The returned string should only have a single space separating the words. Do not include any extra spaces.

Example 1:
Input: s = "the sky is blue"
Output: "blue is sky the"

Example 2:
Input: s = "  hello world  "
Output: "world hello"
Explanation: Your reversed string should not contain leading or trailing spaces.

Example 3:
Input: s = "a good   example"
Output: "example good a"
Explanation: You need to reduce multiple spaces between two words to a single space in the reversed string.
* @param {string} s
* @return {string}
*/
var reverseWords = function (s) {
  const strArray = s
    .trim()
    .split(" ")
    .filter((e) => e !== "");
  let left = 0;
  let right = strArray.length - 1;
  while (left < right) {
    [strArray[left], strArray[right]] = [strArray[right], strArray[left]];
    left++;
    right--;
  }
  return strArray.join(" ");
};