Reverse Words in a String III

Description

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: "Let's take LeetCode contest"
Output: "s'teL ekat edoCteeL tsetnoc"

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

Solution(javascript)

/**
 * @param {string} str
 * @returns {string}
 */
const reverseWords = str => str.trim()
  .split(/\s+/)
  .map((s) => {
    let returned = ''
    for (let i = s.length-1; i >= 0; i--) {
      returned += s[i]
    }
    return returned
  })
  .join(' ')