javascript how to reverse a string

function reverseString(s){
    return s.split("").reverse().join("");
}
reverseString("Hello");//"olleH""this is a test string".split("").reverse().join("");
//"gnirts tset a si siht"

// Or
const reverse = str => [...str].reverse().join('');

// Or
const reverse = str => str.split('').reduce((rev, char)=> `${char}${rev}`, '');

// Or
const reverse = str => (str === '') ? '' : `${reverse(str.substr(1))}${str.charAt(0)}`;

// Example
reverse('hello world');     // 'dlrow olleh'return str.split("").reverse().join("");// hey buddy, here are different implementations, choose your favourite !!


// best implementation
const reverse = (str) => str.split("").reverse().join("");


// explanation
function reverse1(str) {
  // turn string to array, each char of the string will be part of the
  // array as an individual element
  const arr = str.split("");

  // swap all the indexes of the array
  arr.reverse();

  // join every element back together
  const res = arr.join("");
  return res;
}


//  without using REVERSE method
//  recursive function
function reverse2(str) {
  let res = "";
  for (let i = 0; i < str.length; i++) res = str[i] + res;
  return res;
}


// using REDUCE ( high order array function )
function reverse3(str) {
  return str.split("").reduce((output, char) => {
  return char + output;
  }, "");
}function reverseString(str) {
    return str.split("").reverse().join("");
}
reverseString("hello");function reverseString(str) {
    // Step 1. Use the split() method to return a new array
    var splitString = str.split(""); // var splitString = "hello".split("");
    // ["h", "e", "l", "l", "o"]
 
    // Step 2. Use the reverse() method to reverse the new created array
    var reverseArray = splitString.reverse(); // var reverseArray = ["h", "e", "l", "l", "o"].reverse();
    // ["o", "l", "l", "e", "h"]
 
    // Step 3. Use the join() method to join all elements of the array into a string
    var joinArray = reverseArray.join(""); // var joinArray = ["o", "l", "l", "e", "h"].join("");
    // "olleh"
    
    //Step 4. Return the reversed string
    return joinArray; // "olleh"
}
 
reverseString("hello");