Answering each question with in the file by puting // to separate from the code

Author: Abrsh100

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

@@ -7,3 +7,13 @@ 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
+
+//Answer
+
+// This code is not working because slice() is working with "string" or "arrays" but not with numbers. and cardNumber is a number.
+// So the error is "TypeError:cardNumber.slice is not a function"\
+// slice() didn't recognize the number as I expected before.
+
+const cardNumber = 4533787178994213;
+const last4Digits = String(cardNumber).slice(-4);
+console.log(last4Digits)

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

@@ -1,2 +1,5 @@
 const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const 24hourClockTime = "08:53";
+// the 12 and 24 are changing position 
+const 24HourClockTime = "20:53";
+const 12hourClockTime = "08:53";

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

@@ -13,10 +13,37 @@ console.log(`The percentage change is ${percentageChange}`);
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
 
+// There are five functions calls.
+//carPrice.replaceAll(",", "")
+//Number(carPrice.replaceAll(",", ""))
+//priceAfterOneYear.replaceAll("," "")
+//Number(priceAfterOneYear.replaceAll("," ""))
+//console.log(`The percentage change is ${percentageChange}`)
+
 // 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?
 
+// When I run the code the error is "syntaxError: missing ) after argument list.
+// The error comes from line 5
+// The error occurs due to the missing coma between the two strings in the replaceAll() call.
+// Add coma between the two strings "priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));"
+
 // c) Identify all the lines that are variable reassignment statements
 
+// there are to lines that state variable reassignment
+// carPrice = Number(carPrice.replaceAll(",", ""));
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+
 // d) Identify all the lines that are variable declarations
 
+// There are fore variable declarations (line 1, line 2, line 7, line 8)
+// let carPrice = "10,000";
+// let priceAfterOneYear = "8,543";
+// const priceDifference = carPrice - priceAfterOneYear;
+// const percentageChange = (priceDifference / carPrice) * 100;
+
+
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+// carprice at line 1 is a string in order to calculate for the next line of codes you have to change the string ti number.
+// carPrice.replaceAll(",","")). delete the coma in between the number (e.g from "10,000" to "10000")
+// number() change the string to number ("10000" to 10000)

Sprint-1/3-mandatory-interpret/2-time-format.js

@@ -12,14 +12,21 @@ console.log(result);
 // For the piece of code above, read the code and then answer the following questions
 
 // a) How many variable declarations are there in this program?
+// There are 6 variable declaration. "line1, line3, line4, line6, line7, line9"
 
 // b) How many function calls are there?
+// There is only one function call in this program "console.log(result);"
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// % is called remainder. There fore movieLength % 60 represents the remainder of the movie length after dividing by 60.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// totalMinutes are calculated by subtracting the remaining seconds from movie length and divided by 60 to get full minutes. this helps to get a number which divided by 60 with out reminder.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// result represents the total length of the movie in the form of Hour: minute: second
+// moveDurationFormatted can be a better name to replace result. 
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Yes it works for all value. the only thing that is concerning is the validation of movieLength as the negative integer also gives value which is unrealistic. 

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -1,4 +1,4 @@
-const penceString = "399p";
+onst penceString = "399p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
@@ -25,3 +25,13 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP = penceString.substring( 0, penceString.length - 1);
+//    This remove the p and left the string with only 399
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//    this code make sure that the string has 3 character. since one pound is equal 100 pence.
+// 4. const pounds = paddedPenceNumberString.substring( 0, paddedPenceNumberString.length - 2);
+//    This code takes the number leaving the last 2 digits  "in this case it takes 3 and leave 99"
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2)  .padEnd(2, "0");
+//    This code takes the last digit from the string and also make sure that it has only two digits this gives a "99" value.
+// 6. console.log(`£${pounds}.${pence}`);
+//    his gives a result with £ sign and separated by . " in this case it gives £3.99 "