- Know how to use
trimto remove leading or trailing spaces.
/ +/gregex to replace multi spaces with
- Convert string to arr, then use double pointers method to reverse.
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.
Input: s = "a good example"