151-reverse-words-in-a-string

151. Reverse Words in a String (Medium) (https://leetcode.com/problems/reverse-words-in-a-string/)

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. Constraints: - 1 <= s.length <= 10^4 - s contains English letters (upper-case and lower-case), digits, and spaces ’ ’.

• There is at least one word in s. Follow-up: If the string data type is mutable in your language, can you solve it in-place with O(1) extra space?

function reverseWords(s: string): string {
  return s.trim().split(/\s+/).reverse().join(" ");
}
 
// Local check:
console.log(reverseWords("the sky is blue"));
console.log(reverseWords("  hello world  "));
console.log(reverseWords("a good   example"));

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.

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