Apply changes commentd by the reviewer

Author: mohsenzamanist

Sprint-1/1-key-exercises/4-random.js

@@ -10,4 +10,5 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
 console.log(num);
 
-// minimum <= num => maximum
+// num is a random number between 1 and 100(inclusive)
+// using Math.random which returns a number between 0(inclusive) and 1(exclusive)

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

@@ -1,2 +1,5 @@
 // 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?
+
+// running the code throws error because it is written in human language for human understanding
+// so it must be commented

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

@@ -1,4 +1,8 @@
 // trying to create an age variable and then reassign the value by 1
 
-let age = 33;
-age = 1;
+const age = 33;
+age = age + 1;
+
+// TypeError: Assignment to constant variable.
+// JS throws above error because the variable age is declared as a constant
+// and can not be reassigned.

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

@@ -1,5 +1,8 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
 
-const cityOfBirth = "Bolton";
 console.log(`I was born in ${cityOfBirth}`);
+const cityOfBirth = "Bolton";
+
+// cityOfBirth is declared before initialization
+// so JS can not access it

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

@@ -1,5 +1,5 @@
-const cardNumber = 4533787178994213;
-const last4Digits = String(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
@@ -8,5 +8,8 @@ const last4Digits = String(cardNumber).slice(-4);
 // 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 is a string method but cardNumber is a number
-console.log(Number(last4Digits));
+// the code will throw error because slice is a string method
+// and not a Number method
+
+// TypeError: cardNumber.slice is not a function
+// my prediction was correct

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -12,7 +12,7 @@ console.log(`The percentage change is ${percentageChange}`);
 // Read the code and then answer the questions below
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
-// 4
+// 5 times  (called on lines: 4, 4, 5, 5, 10 )
 
 // b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
 // Line 5. It is a syntaxError. string.replaceAll() is missing a ','