completed 3.js with comments also commented out question in 1.js and 2.js

Author: AngelaMcLeary

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

@@ -1,10 +1,11 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
-age = age + 1;
+//const age = 33;
+//age = age + 1;
 
 //Answer:
 //we cannot re-assign variables with "const". 
 // We have use "let". let allows the variable to be re-assigned.
 let age = 33;
 age = age + 1;
+console.log(age);

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

@@ -1,12 +1,12 @@
 // 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}`);
-const cityOfBirth = "Bolton";
+//console.log(`I was born in ${cityOfBirth}`);
+//const cityOfBirth = "Bolton";
 
 //*Answer
 // The console.log is before the variable and it cannot see it. 
-// The console log needs to be blow the variable to compute the data.
+// The console log needs to be below the variable to compute the data.
 
 const cityOfBirth = "Bolton";
 console.log(`I was born in ${cityOfBirth}`);

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

@@ -1,9 +1,24 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+//const cardNumber = 4533787178994213;
+//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
+//*Answer
+//It won't work because cardNumber is not a string and .slice() only works with strings. It will throw an error.
+
 // Then run the code and see what error it gives.
+//*Answer
+//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?
+//*Answer
+//I was right. cardNumber is a number not a string and .slice() only works with strings 
+// so it needs to be converted to a string to work using .toString()
+
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+//*Answer
+const cardNumber = 4533787178994213;
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits);