reverseString: Make hint more generic (#578)

Provide alternative solution that also draws from the Loops and Arrays lesson.

Author: sajwan05

07_reverseString/README.md

@@ -7,4 +7,5 @@ reverseString('hello there') // returns 'ereht olleh'
 ```
 
 ## Hints
-Strings in JavaScript cannot be reversed directly so you're going to have to split it into something else first.. do the reversal and then join it back together into a string.
+Strings in JavaScript are immutable and, therefore, cannot be reversed directly in place. While there is no built-in method for this, several alternative approaches can be used, drawing on the concepts you've been introduced to in the lessons.
+

07_reverseString/solution/reverseString-solution.js

@@ -3,3 +3,17 @@ const reverseString = function (string) {
 };
 
 module.exports = reverseString;
+
+
+
+// Another approach could be to loop over the string in reverse direction to construct a new one
+/*
+  const reverseString = function (string) {
+    let reversedString = "";
+
+    for (let i = string.length -1; i >= 0; i--) {
+      reversedString += string[i];
+    }
+    return reversedString;
+  };
+*/