completed all three excerises in this sprint

Author: Enice-Codes

Module-Structuring-and-Testing-Data

@@ -0,0 +1 @@
+Subproject commit b31a586bf20de09330f37bcf5d708e5ecd67f45b

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

@@ -13,3 +13,4 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
 // It will help to think about the order in which expressions are evaluated
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+console.log(num);

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

@@ -1,2 +1,7 @@
 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?
+We don't want the computer to run these 2 lines - how can we solve this problem?
+
+// we can use //to comment out the lines of code we don't want to run.
+
+//his 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
 
-const age = 33;
+let age = 33;
 age = age + 1;
+console.log(age);

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 ?
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+// the error is that the variable cityOfBirth is being use in the console.log statement  before it is declared with let or const unlike var.
+ 

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

@@ -1,6 +1,18 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
 
+const last4Digits =  String(cardNumber).slice(-4);
+
+
+console.log(last4Digits); // "4213"
+
+
+let prediction = " because of the lack of slice method available for numbers,I predict that the code will throw an error. the cardNumber variable is a number, and slice is a method that can only be used on strings or arrays.";
+ slice is a method that can only be used on strings or arrays."
+ 
+ //.slice () works on arrays and strings 
+
+ // i ran the code the error i got was excatly as predicted.
+ 
 // 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

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

@@ -1,2 +1,5 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+ // the code having an error because the variable is not named correctly,has to be twelvehourclocktime instead of 12hourclocktime.
+const twentyFourHourClockTime = "20:53"; 
+// the code having an error because the variable is not named correctly,has to be twentyfourhourclocktime insted of 24hourclocktime.
+

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

@@ -2,7 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ,""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -12,11 +12,19 @@ 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
+//one function call in line 4 ,5 
 
 // 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?
+// there  seem to be no error when running the code.
 
 // c) Identify all the lines that are variable reassignment statements
+// line 4 and 5 
 
 // d) Identify all the lines that are variable declarations
+// 1,2,7,8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+// The expression `Number(carPrice.replaceAll(",", ""))` is performs two operations. it uses the `replaceAll` method to remove all commas from the string `carPrice`, effectively converting it from a formatted string o a plain number string. 
+//Then, it converts that resulting string into a number using the `Number()` function. 
+//The purpose of this expression is to convert a formatted price string into a numerical value that can be used for calculations.    

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

@@ -7,19 +7,26 @@ const remainingMinutes = totalMinutes % 60;
 const totalHours = (totalMinutes - remainingMinutes) / 60;
 
 const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
-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?
+// 6 variables in total: movieLength, remainingSeconds, totalMinutes, remainingMinutes, totalHours, result  
 
 // b) How many function calls are there?
+// there are 3 function calls in line 4,7 and 9 
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+// it means that the movie hour  is being calculated. totalminutes minus remainingseconds divided by 60.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+// the variable result represents the total length of the movie in hours and minutes.
+//Better name is MOvieTime.
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Yes, this code will work for all values because it is using the modulus operator to calculate the remaining seconds and is using division to calculate the total hours. 
+// The code will correctly handle any length of movie in seconds and convert it to the appropriate format.
+

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

@@ -24,4 +24,10 @@ console.log(`£${pounds}.${pence}`);
 // Try and describe the purpose / rationale behind each step
 
 // To begin, we can start with
-// 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 1. const penceString = "399p": // the "399p"represents the amount in pence.
+// initializes a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): // the trailing 'p'has been removed  from the string to isolate the numeric value.
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): // ensures that the numeric value has at least three digits by padding with leading zeros .
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): // extracts the pounds portion of the string by taking all but the last two characters.
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): // extracts the pence portion of the string by taking the last two characters and ensures it has two digits by padding with trailing zeros .
+// 6. console.log(`£${pounds}.${pence}`): // outputs the final formatted price in pounds and pence to the console, prefixed with the pound symbol (£).