Reverse Words in a String

Description

Given an input string, reverse the string word by word.

 

Example 1:

Input: "the sky is blue"
Output: "blue is sky the"

Example 2:

Input: "  hello world!  "
Output: "world! hello"
Explanation: Your reversed string should not contain leading or trailing spaces.

Example 3:

Input: "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.

 

Note:

• A word is defined as a sequence of non-space characters.
• Input string may contain leading or trailing spaces. However, your reversed string should not contain leading or trailing spaces.
• You need to reduce multiple spaces between two words to a single space in the reversed string.

 

Follow up:

For C programmers, try to solve it in-place in O(1) extra space.

Solution(javascript)

/**
 * @param {string} str
 * @returns {string}
 */
const reverseWords = str => str.trim().split(/\s+/).reverse().join(' ')