Completed all tasks in mandatory errors folder

Author: ausiejute

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

@@ -1,2 +1,4 @@
-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?
+
+// the answer: by using "//" on each line

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

@@ -1,4 +1,12 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+// const age = 33;
+// age = age + 1;
+
+// the error is in line 4. It's a "TypeError: Assignment to constant variable", which was thrown because the value to
+// a specific constant can only be assigned once (which is done in line 3 already).
+// This wouldn't throw an error if instead of const, the let was used
+
+let age = 33;
 age = age + 1;
+console.log(age);

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

@@ -1,5 +1,11 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
 
-console.log(`I was born in ${cityOfBirth}`);
+// console.log(`I was born in ${cityOfBirth}`);
+// const cityOfBirth = "Bolton";
+
+// an error in line 4, "ReferenceError: Cannot access 'cityOfBirth' before initialization", which proves my assumption that
+// the value of cityOfBirth should have been assigned prior to trying to print the string
+
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -1,9 +1,17 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
+//const last4Digits = cardNumber.slice(-4);
 const last4Digits = cardNumber.slice(-4);
+console.log(last4Digits);
 
 // 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
 // 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
+
+// I thought it was something to do with the slice "-4" (but i turned out i forgot that negative indices start at -1, not 0)
+// The actual error indicates that on the 3rd line there is a typeError: "cardNumber.slice is not a function"
+// Checked the error reference and decided to look more closely. Noticed that the card number is used as a number,
+// so it answers why the function couldn't be called - because they can be only called on Arrays and Strings.
+// Therefore, I'll add parentheses to turn the card number into a string (so that the function could be called)

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

@@ -1,2 +1,9 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+// const 12HourClockTime = "8:53pm";
+// const 24hourClockTime = "20:53";
+
+// SyntaxError: Invalid or unexpected token.
+// it turns out that in JS variable names cannot begin with a number
+
+const HourClockTime12 = "8:53pm";
+const HourClockTime24 = "20:53";
+console.log(HourClockTime24);