Glasgow | ITP-Jan-2026 | Alasdair MacDonald | Sprint 1 | Structuring and Testing Data

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

@@ -4,3 +4,4 @@ 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
+// Line 3 reassigns the variable count by taking its current value, adding 1 to it, and storing the new value back into count. The = operator assigns the value on the right to the variable on the left.

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

@@ -5,7 +5,8 @@ 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];
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 
+console.log(initials);

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

@@ -17,7 +17,9 @@ 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 dir = filePath.slice(0, lastSlashIndex);
+
+const lastDotIndex = base.lastIndexOf(".");
+const ext = base.slice(lastDotIndex + 1);
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -3,7 +3,15 @@ const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
+console.log(num);
 // In this exercise, you will need to work out what num represents?
 // 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
+
+// Math.random https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
+// Math.floor https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/floor
+// mdn order of operations javascript https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_precedence
+
+
+// It generates a random whole number between 1 and 100

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 +1,10 @@
 // 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);
+
+// Another way to write this code...
+// let age = 33;
+// 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 variable was declared after console.log

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

@@ -1,9 +1,13 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().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
 // 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
+
+// This won't work because cardNumbers is a number, and numbers don't have the .slice() method.

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

@@ -1,2 +1,5 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twelveHourClockTime = "20:53";
+const twentyFourHourClockTime = "08:53";
+
+console.log(twelveHourClockTime);
+console.log(twentyFourHourClockTime);

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 +12,16 @@ 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
+// There is 5 function calls, anything that has () afterwards is a function. 
 
 // 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?
+// I added a a comma , here --> (priceAfterOneYear.replaceAll(",", "")); as this was missing, I seen this as soon as i opened this exercise.
 
 // c) Identify all the lines that are variable reassignment statements
+// Lines 4 and 5 are reassignments, carPrice was declared with let and priceAfterOneYear was already declared with let.
 
 // d) Identify all the lines that are variable declarations
+// There is 4 declarations in total, theres where all varibales crated using let,const and var. (lines 1,2,7,8)
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// breaking it down this part, carPrice.replaceAll(",", "") removes all commas from the string. Next step is this Number("10000"), this converts the string into a number.

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

@@ -12,14 +12,23 @@ 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 is 6 variable declarations in this program. 
 
 // b) How many function calls are there?
+// There is 1 function call. console.log();
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// This means divide movieLength  by 60 and return what is left over.
+
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// Subtract the leftover seconds and divide by 60 so this calculates the total number of full minutes in the movie.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// This builds a formatted string that looks like hours:minutes:seconds so the movie duration converted in time format (HH:MM:SS)
+// Result is quite vague a better variable name could be formattedTime 
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// This works for positive whole numbers and any length in seconds.
+// It doesn't work handling negative numbers properly.

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

@@ -25,3 +25,17 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. penceString.length gives the length of "399p" -> 4, length -1 = 3, substring(0,3) takes characters from idex 0 up to (but not including) index 3
+// 3. padStart(3, "0") ensures the string is at least 3 characters long.
+// 4. const pounds = paddedPenceNumberString.substring(
+// 0,
+//  paddedPenceNumberString.length - 2
+// );
+// What this does: it takes everything except the last 2 digits. Because: The last 2 digits represent pence and everything before that represents pounds.
+// 5.  substring(length - 2) --> takes the last 2 digits, .padEnd(2, "0") ensures it is always 2 digits.
+// 6. console.log() --> builds a formatted currency string £3.99
+
+// This program is doing overall, removing the "p", 
+// ensuring there are at least 3 digits, 
+// splitting the number into pounds and pence,
+// finally formatting it into a proper currency format.

Sprint-1/4-stretch-explore/chrome.md

@@ -16,3 +16,8 @@ Now try invoking the function `prompt` with a string input of `"What is your nam
 
 What effect does calling the `prompt` function have?
 What is the return value of `prompt`?
+
+// The returned value of prompt --> The string I typed or null if I press cancel.
+I typed Alasdair and when I called myName it was stored inside that variiable called myName.
+
+let myName = prompt("What is your name?");

Sprint-1/4-stretch-explore/objects.md

@@ -14,3 +14,6 @@ Answer the following questions:
 
 What does `console` store?
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+
+Typing console.log shows a function definition (e.g. ƒ log() { [native code] }). This means console.log is a built-in function provided by the browser.