Fix 4.js: rename variables to not start with a digit, add explanation

Author: lamlakamana-oss

Sprint-2/2-mandatory-errors/4.js

@@ -1,2 +1,10 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+const twentyFourHourClockTime = "20:53";
+
+// Error: SyntaxError: Invalid or unexpected token
+// Cause: I originally named the variables 12HourClockTime and 24hourClockTime,
+//        but JavaScript doesn't allow variable names to start with a number.
+//        They have to start with a letter, an underscore, or a dollar sign.
+//        The parser was reading 12 as a number and then got stuck on the "H".
+// Fix: Renamed them to twelveHourClockTime and twentyFourHourClockTime so they
+//      start with letters instead of digits.