West Midlands | May 2026 | Muhammad-Burhan Mustafa | Sprint 1 | Module-Structuring-and-Testing-Data

Sprint-1/1-key-exercises/1-count.js

@@ -4,3 +4,7 @@ count = count + 1;
 
 // Line 1 is a variable declaration, creating the count variable with an initial value of 0
 // Describe what line 3 is doing, in particular focus on what = is doing
+
+//Answer: Line 3  is updating the value of the count variable by 1 to the current value of count.
+// The = operator reassigns the value of count to be equal to  (count + 1), which is the current value of count plus 1.
+//This creates a counter that always increases by an increment of 1.

Sprint-1/1-key-exercises/2-initials.js

@@ -5,7 +5,7 @@ let lastName = "Johnson";
 // Declare a variable called initials that stores the first character of each string.
 // This should produce the string "CKJ", but you must not write the characters C, K, or J in the code of your solution.
 
-let initials = ``;
+let initials = firstName[0] + middleName[0] + lastName[0];
+console.log("The initials are", initials);
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
-

Sprint-1/1-key-exercises/3-paths.js

@@ -17,7 +17,11 @@ console.log(`The base part of ${filePath} is ${base}`);
 // Create a variable to store the dir part of the filePath variable
 // Create a variable to store the ext part of the variable
 
-const dir = ;
-const ext = ;
+const lastDotIndex = filePath.lastIndexOf(".");
+const firstSlashIndex = filePath.indexOf("/");
+const dir = filePath.slice(firstSlashIndex, lastSlashIndex);
+const ext = filePath.slice(lastDotIndex);
+console.log(`The directory is ${dir}`);
+console.log(`The ext is ${ext}`);
 
-// https://www.google.com/search?q=slice+mdn
+// https://www.google.com/search?q=slice+mdn

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

@@ -7,3 +7,5 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // Try breaking down the expression and using documentation to explain what it means
 // 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
+
+//Answer: Firstly, a random number in the range [0, 1) is generated, meaning it is greater than or equal to 0 BUT less than 1. That number is multiplied by 100, always rounded down to the nearest whole number, and then the minimum value of 1 is added.

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

@@ -1,2 +1,2 @@
-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?

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

@@ -1,4 +1,6 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+var age = 33;
 age = age + 1;
+
+console.log(age);

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

@@ -1,5 +1,6 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
+// We were trying to call a the variable before it was even initialized / made.
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -1,6 +1,6 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
-
+const last4Digits = String(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

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const civilTime = "8:53pm";
+const continentalTime = "20:53";

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 +12,13 @@ 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
-
+// Answer: There are 5 function calls on lines 4, 5 and 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?
-
+// Answer: line 5 there is a comma missing in the replaceAll parameters.
 // c) Identify all the lines that are variable reassignment statements
-
+// Answer:  Lines 4 and 5
 // d) Identify all the lines that are variable declarations
-
+// Answer: Lines 1, 2, 7 and 8
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// Answer: The purpose is to remove the comma from carPrice and turn it into a number, so it can be used in the calculation.
+// Without doing this, JavaScript would treat it like a string instead of a proper number.

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = "839f"; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +12,15 @@ 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?
-
+// Answer: There is 6 variable declarations
 // b) How many function calls are there?
-
+// Answer: There is one function call on line 10
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
-
+// Answer: this finds the remainder of movieLength when its divided by 60
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
-// e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+// Answer: The expressions uses the modulo function to work out the remainder value which in this case works out the remaining seconds of the total movie length
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Answer:  No it only works as intended when a Non negative integer is used however when Decimal, negative, or string values it does not work as intended.
+// Decimal values will display decimal seconds, which does not cause an error, but the output may not be in the expected time format.
+// Negative values will produce negative time values, and string values may produce NaN if they cannot be converted into a number.

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

@@ -25,3 +25,22 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// 3–6. const penceStringWithoutTrailingP takes the initial constant variable with the value of "399p" and uses the substring function to make a new string
+//     without the "p". It uses the .length property to return the number of characters in the string and subtracts 1 so that substring stops before the last
+//     character, which will always remove the "p".
+
+// 8.  the next variable paddedPenceNumberString takes the previous string which only has number characters and checks if it is made up of three characters if it is not it
+//     is padded with "0" at the start of the string till there are three characters the reason for this is the minimum amount of characters needed to represent pounds and
+//     pence can be represented by is 3.
+
+// 9-12. The next variable pounds takes the previous variable paddedPenceNumberString and uses the substring function to create a new string without the last
+//     two characters. It uses .length - 2 to stop before the final two characters because those characters represent the pence leaving only the characters
+//     that represent the pounds.
+
+// 14-16. The next variable pence takes paddedPenceNumberString and uses the substring function starting from two characters before the end of the string.
+//     This creates a new string containing only the final two characters which represent the pence. The padEnd function then adds "0" to the end of the
+//     string until it contains two characters making sure that the pence is always displayed using two digits.
+
+// 18. The console.log uses a template literal to combine the pound sign with the pounds and pence variables. A decimal point is placed between the two
+//     variables so that the final value is displayed as a price in pounds, for example "£3.99".