Add comments to explain the errors

Author: anosidium

Sprint-1/2-mandatory-errors/1.js

@@ -2,3 +2,5 @@
 
 let age = 33;
 age = age + 1;
+
+// You cannot mutate a constant so you need to change it to a variable where mutation is permitted

Sprint-1/2-mandatory-errors/2.js

@@ -3,3 +3,5 @@
 
 const cityOfBirth = "Bolton";
 console.log(`I was born in ${cityOfBirth}`);
+
+// The order of the code matters, the constant needs to be defined first before it can be used

Sprint-1/2-mandatory-errors/3.js

@@ -7,3 +7,6 @@ const last4Digits = `${cardNumber}`.slice(-4)
 // Then run the code and see what error it gives.
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+// slice() function only work on String type and not on Number type.
+// So, convert the Number type into a String type in order to use slice() function

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,4 @@
 const _12HourClockTime = "20:53";
-const _24hourClockTime = "08:53";
+const _24hourClockTime = "08:53";
+
+// Variables and constants name cannot begin with a number but can include number later on