how to reverse a particular string in js code example

Example 1: reverse string js

str.split('').reduce((reversed, character) =>{
    return character + reversed;
  }, '');
//apple = leppa

Example 2: reverse a word javascript

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