Coderbyte Reverse string Challenge

1-FirstReverse.js

// http://coderbyte.com/CodingArea/GuestEditor.php?ct=First%20Reverse&lan=JavaScript
function FirstReverse(str) { 
  var string = [];
  for(i = 0; i <= str.length; i++) {
    string[i] = str[str.length - i];
  }
  // code goes here  
  return string.join("");
}
   
// keep this function call here 
// to see how to enter arguments in JavaScript scroll down
FirstReverse(readline());