On-line Cadeia Reversa

I have a hex string : 81 61 08 0a a0 80 04

now I want to reverse it like : 04 80 a0 0a 08 61 81

I have tried converting hex to number and then reversing it and convert back to hex but it doesn't provide the required result.

if it's newRev += str[i] it's hello but if str[i] is first it's reversed why?

function rev(str){  newRev = '' for(let i = 0; i < str.length; i++) {   newRev = str[i] + newRev } return newRev}console.log(rev('hello'))

I'm working on an exercise and I can't use any kind of Array.prototype.reverse or Array.prototype.join. I have to reverse every string in an array individually and print them on separate lines.

Here is what I've tried :

// Create a function that reverses elements of a stringlet reversedStuff = function (str) {  let newReversed = "";  for (let i = str.length - 1; i >= 0; i--) {    newReversed += str[i];  }  return newReversed;};// Use the previous function to apply the reverse on each string of an arrayconst args = process.argv.slice(2);let allArr = [];let eachWord = function (args) {  for (let y = 0; y <= args.length; y++) {    return functionReverse(args)  }};console.log(eachWord(args));

The problem is with my first function. I can't quietly fins a way to apply the reverse function on every string of an array, it only applies on the first one. Any tips on how to approach this problem?

Thank you so much in advance!

How can we reverse a simple string in Go?

I tried coderbyte and looks something is wrong with it. The first challenge is simply to reverse a string. I did this in java:

import java.util.*; import java.io.*;class Main {  public static String FirstReverse(String str) {    char[] chars = str.toCharArray();    String ret = "";    for (int i = chars.length - 1; i >= 0; i--) {      ret += chars[i];    }    return ret;  }  public static void main (String[] args) {      // keep this function call here         Scanner s = new Scanner(System.in);    System.out.print(FirstReverse(s.nextLine()));   }}

It said, that three test cases had wrong output and there was the correct output. I tried running the code with the specified cases and it printed the same string as correct output for that case. So I tried resubmitting it and it said that only one test case was correct and all other had wrong out put. So I said OK and rewrote my code this way:

import java.util.*; import java.io.*;class Main {  public static String FirstReverse(String str) {    return new StringBuilder(str).reverse().toString();  }  public static void main (String[] args) {      // keep this function call here         Scanner s = new Scanner(System.in);    System.out.print(FirstReverse(s.nextLine()));   }}

Unfortunately it still says only one test case was successful... Any ideas what happened? Thanks