Here's the question reformatted to be more concise and direct:

Reverse String

Create code to reverse a string. For example, "hello" should become "olleh". Return an empty string if the input is empty, and null if the input is null.

Examples:

Input: str = "hello" Output: "olleh" Input: str = "Hi There" Output: "erehT iH" Input: str = "" Output: "" Input: str = null Output: null
Apex Code Editor
Log In
Log in to submit your code and save your progress.

Welcome to Lightning Challenge!

Create an Account

Sign up to track your progress, earn points, and compete with others. Your solutions will be saved automatically.

Create account

How It Works

  • • Write your solution in the code editor
  • • Connect your Salesforce org to test
  • • Submit to check if your solution passes
  • • Use hints if you get stuck

Contest Alert

🏆 #CodeEveryDay Contest

Two ways to win a free Salesforce certification voucher:

  • The #1 ranked player on our #CodeEveryDay leaderboard by June 28th
  • Complete challenges to enter our random drawing! Each challenge you complete gives you an additional entry, increasing your chances to win.

Contest runs June 16-28. Additional prizes available for other top leaderboard positions. Track your position and compete for prizes!

Points are only calculated for questions created and completed during the contest period. If you previously won, you are not eligible to win the certification voucher again.