how to reverse word in javascript code example

Example 1: javascript reverse a string

function reverseString(s){
    return s.split("").reverse().join("");
}
reverseString("Hello");//"olleH"

Example 2: reverse words in a string javascript

function reverseString(str) {
    return str.split("").reverse().join("");
}
reverseString("hello");

Example 3: javascript reverse string

function reverseString(str) {
  if (str === "")
    return "";
  else
    return reverseString(str.substr(1)) + str.charAt(0);
}
reverseString("hello");

Example 4: reverse a word javascript

function reverseWords(str) {
  const allWords = str.split(" ")
  return allWords.map(item => item.split("").reverse().join("")).join(" ")
}