Fix Sprint 1 mandatory errors

Author: shafiekwalker7861

Sprint-1/2-mandatory-errors/0.js

@@ -1,2 +1,2 @@
-This is just an instruction for the first activity - but it is just for human consumption
-We don't want the computer to run these 2 lines - how can we solve this problem?
+// This is just an instruction for the first activity - but it is just for human consumption
+// We don't want the computer to run these 2 lines - how can we solve this problem?

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

@@ -1,4 +1,5 @@
 // trying to create an age variable and then reassign the value by 1
+// A const variable cannot be reassigned.It it constant
 
-const age = 33;
+let age = 33;
 age = age + 1;

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

@@ -1,5 +1,5 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
-// what's the error ?
+// what's the error ? - The variable is being used before it's declared
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -3,7 +3,15 @@ const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
+
 // Before running the code, make and explain a prediction about why the code won't work
+// .Slice only works on strings, not numbers. Therefore, the code will throw an error 
+
 // Then run the code and see what error it gives.
+// Uncaught TypeError: cardNumber.slice is not a function
+
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
+// The error is what I predicted. The slice method is not a function that can be used on numbers, only strings.
+
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+const last4Digits = cardNumber % 10000;

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

@@ -1,2 +1,4 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+const twentyFourHourClockTime = "20:53";
+
+// Variable names cannot start with a number, so the variable name "24HourClockTime" and "12HourClockTime" is invalid.