Cape Town | sep-2026-itp | Matthaus Bause | Sprint 2| Complete Sprint 2 courswork

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

@@ -2,5 +2,6 @@ let count = 0;
 
 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
+console.log(count);
+// Line 3 is updating the value of the variable count by adding 1 to its current value. The = operator is used to assign the new value (which is the result of count + 1) back to the variable count. This means that after line 3 executes, count will hold a value that is one greater than it did before.
+

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

@@ -5,6 +5,7 @@ const 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.
 
-const initials = ``;
+const initials = `${firstName[0]}${middleName[0]}${lastName[0]}`;
+console.log(initials); // Output: CKJ
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn

Sprint-2/1-key-exercises/3-paths.js

@@ -17,7 +17,10 @@ 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(1, lastSlashIndex);
+const ext = filePath.slice(filePath.lastIndexOf("."));
+
+console.log(`The dir part of ${filePath} is ${dir}`);
+console.log(`The ext part of ${filePath} is ${ext}`);
 
 // https://www.google.com/search?q=slice+mdn

Sprint-2/1-key-exercises/4-random.js

@@ -3,7 +3,22 @@ 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?
+
+// Answer: num is represents a random integer inclusive between minimum and maximum 
+
 // 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
+// Answers: const minimum = 1 (thats's the minimum number constent variable)
+//          const maxiumum = 100 (that's the maxiumum number constant variable)
+//          Math.random: generates a random decimal number between 0 and 1
+//          (maximum - minimum + 1) Calculates the range of possible numbers (100 - 1 + 1=100)
+//          Math.random() * (maximum - minimum + 1) scales a random decimal to range a between 0 and 99.99
+//          Math.floor: Rounds the decimal down to the nearest whole interger (0 to 99)
+//          + minimum: shifts the range up by 1, resulting in the whole number from 1 to 100
+
+
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+// ran a console.log and the num value returned randomly each time 

Sprint-2/2-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?
+
+//By commenting it out
+
+//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-2/2-mandatory-errors/1.js

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

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

@@ -1,5 +1,7 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
+// Answer: because javascript runs from top to bottom, by declaring the const after running console.log the function throws an error because the decleration is done ater console.log
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+

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

@@ -1,9 +1,13 @@
-const cardNumber = 4533787178994213;
+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
 // Before running the code, make and explain a prediction about why the code won't work
+// The .slice() can't be called using numeric values only string values
 // Then run the code and see what error it gives.
+// This is just an instruction for the first activity - but it is just for human consumption
+//TypeError: cardNumber.slice is not a function
 // 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
+console.log(last4Digits)

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

@@ -1,2 +1,7 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const clockTime12Hour = "8:53pm";
+const clockTime24Hour = "20:53";
+
+console.log(clockTime12Hour);
+console.log(clockTime24Hour);
+
+// variable names can't be declared when starting with numbers, only letters

Sprint-2/3-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
+// i) There are five function calls. 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?
+// ii) The error is coming from line 5. There wasn't a , seperating what the replaceAll function should replace the initial "," with "" so that Javascript knows to remove the , in line 2.
 
 // c) Identify all the lines that are variable reassignment statements
+// iii) Lines 4 and 5 are variable reassignment statetments
 
 // d) Identify all the lines that are variable declarations
+// iv) Lines 1, 2, 7 and 8 are variable declarations.
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// v) It is replacing the string value 10,000 with 10000 by removing the comma and converts the string into a number type so that mathematical operations can be performed on it.

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

@@ -6,20 +6,26 @@ const totalMinutes = (movieLength - remainingSeconds) / 60;
 const remainingMinutes = totalMinutes % 60;
 const totalHours = (totalMinutes - remainingMinutes) / 60;
 
-const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
-console.log(result);
+const timeRemainingHHMMSS = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
+console.log(timeRemainingHHMMSS);
 
 // 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?
+// i) There are 5 variable declerations. Lines 1, 3, 4, 6, 7 and 9
 
 // b) How many function calls are there?
+// ii) There is only one function call. 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
+// iii) the % is a remainder operator telling us how many remaining seconds are left in the variable decleration in line 1
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// iv) line 4 is taking the movieLength 8784 - remainingSeconds 24 which leaves us with a whole value of 146 for the totalMinutes variable decleration.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// v) It represents the total time remaining in HH:MM:SS format, perhaps changing variable decleration to timeRemainingHHMMSS would be more descriptive in what we are trying to achieve?
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// vi) this code won't work for negative number values and non-numeric values, I noticed that single-digit values don't follow the HHMMSS it shows HMSS depending on the value input used such as movieLength = 52.

Sprint-2/3-mandatory-interpret/3-to-pounds.js

@@ -1,20 +1,27 @@
+//declaring a variable with the value of "399p"
 const penceString = "399p";
 
+//the .substring is removing the "p" from the value of penceString by taking the total length of the subString "4" - 1 = 3, by stripping the "p" leaving only 399
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
 
+// padStart is creating a pad for the output by giving it an extra "0" if the value is less than £1
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+
+//The .substring is removing the "99" from the value of .penceStringWithoutTrailingP by taking the total length of the .penceStringWithoutTrailingP "3" - 2 = 1 by stripping the "99" leaving only the 3
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
 
+// the .substring is doing the same as the "pound" variable declared in now line 14, by grabbing the last 2 characters "99" except it is ending the pad as safeguard to always ensure that two digits remain 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
 
+  // console.log is using template literals to combine the currency symbol, pound string decimal point and pence string. Giving us an output of £3.99
 console.log(`£${pounds}.${pence}`);
 
 // This program takes a string representing a price in pence

Sprint-2/4-stretch-explore/chrome.md

@@ -8,8 +8,14 @@ Let's try an example.
 In the Chrome console, invoke the function `alert` with one argument, the string `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+// This created a pop-up saying Hello world!
 
 Now try invoking the function `prompt` with a string input of `"What is your name?"` - store the return value of your call to `prompt` in an variable called `myName`.
+// I did const myName = prompt("What is your name?") 
+//console.log(myName)
 
 What effect does calling the `prompt` function have?
+// Displayed a pop-up text box that I could enter Matthaus, which Javascript stored in the myName variable
+
 What is the return value of `prompt`?
+Matthaus

Sprint-2/4-stretch-explore/objects.md

@@ -5,12 +5,18 @@ In this activity, we'll explore some additional concepts that you'll encounter i
 Open the Chrome devtools Console, type in `console.log` and then hit enter
 
 What output do you get?
+Answer: function log() { (native code) }
 
 Now enter just `console` in the Console, what output do you get back?
+Answer: Output is 'console {debug: function, error: function, info: function, log: function, warn: function, ...} with a drop down list of all functions'
 
 Try also entering `typeof console`
+Answer: output is 'object'
 
 Answer the following questions:
 
 What does `console` store?
+Answer: this stores all the functions that the console has.
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+Answer: 'console' is an object and 'log/assert' is properties of log. the `.` is going to look-up which property is stored in the object