reverse in JS
Description
Unfortunately, this function is not available in JavaScript, but it can be implemented using predefined functions.
Sample Source Pattern 
Implementation Example
function REVERSE(string){
    return string.split("").reverse().join("");
}Arguments
string: String expression to reverse. 
Return Type
String.
Examples
CREATE OR REPLACE FUNCTION REVERSE(str varchar)
  RETURNS string
  LANGUAGE JAVASCRIPT
AS
$$
   return STR.split("").reverse().join("");
$$;
SELECT REVERSE('rotator') PALINDROME;      PALINDROME|      
----------------+
         rotator|  Last updated
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