ZA | MAY-2025 | OBERT TILIMANDZI | MODULE-STRUCTURING AND TESTING DATA | COURSEWORK SPRINT 1

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
+// Answer: "count + 1" is a value being assigned to the variable count and "=" is the assignement operator used to assign values to a variable

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

@@ -5,7 +5,9 @@ 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.charAt(0) + middleName.charAt(0) + lastName.charAt(0)}`;
+
+console.log(initials);
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

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

@@ -10,14 +10,30 @@
 // (All spaces in the "" line should be ignored. They are purely for formatting.)
 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
+
+// Find the last slash and we can seperate the base from "dir"
 const lastSlashIndex = filePath.lastIndexOf("/");
 const base = filePath.slice(lastSlashIndex + 1);
-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
+// Find the last dot
+const lastDot = base.lastIndexOf(".");
+// console.log(`The base part of ${filePath} is ${base}`);
+
+// Ectract everything before the base
+const dir = filePath.slice(0, lastSlashIndex);
+// Extract the txt extention from the dot
+const ext = base.slice(lastDot);
+
+
+
 
-const dir = ;
-const ext = ;
 
-// https://www.google.com/search?q=slice+mdn
+
+
+
+
+
+// Create a variable to store the dir part of the filePath variable
+// Create a variable to store the ext part of the variable
+console.log(`The base part of ${filePath} is ${base}`);
+// Moved to bottom its confusing me

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

@@ -7,3 +7,11 @@ 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: Inermost brackets first (maximum - minimum + 1) this is calcuating the range
+// Math.random generated a number between 0 and 1 but wont get to 1
+// Math.random * 100 moved the comma by 2 decimal places
+// Math.floor wii remove decimal parts of the number
+// + minimum will add 1
+
+console.log(num);

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

@@ -1,4 +1,8 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+age = 1;
+
+
+// Will remove the constant varible and use the let keyword

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 at the bottom so we could not access it, so it has to be hoisted at the top

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

@@ -1,9 +1,18 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+// 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
+// Answer: Missing console.log
 // Then run the code and see what error it gives.
+// Error:we had TypeError: cardNumber.slice is not a function
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
+// "cardNumber.slice" must declared as a function, this is not what i thought, the difference is that the code is incomplete and so will add a function
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+
+// After some research i found out that ".slice()" only works on strings so we have to convert the numbers into a string first
+// Also learned abour method chaining

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

@@ -1,2 +1,4 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const HourClockTime12 = "20:53";
+const hourClockTime24 = "08:53";
+
+// You cannot name a variable starting witha number

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
+    // Anwer: The function is called 4 times in the code line 7 and 8 then we have the built-in functions line 4 and 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?
+    // Answer: The error is coming from line 5 a comma is missing between the quotes '(priceAfterOneYear.replaceAll("," ""))'
 
 // c) Identify all the lines that are variable reassignment statements
+    // Answer: Line 4 and 5
 
 // d) Identify all the lines that are variable declarations
+    // Answer: Line 1, 2, 7 and 8 
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+    // Answer: It removing all the commas and also converting the values to a number

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 81034; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +12,20 @@ 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 are 6
 
 // b) How many function calls are there?
+    // Answer: There are no function calls
 
 // 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 devides values and gives us the remainder 
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+    // Answer: It subtracts remaining seconds from movie length then devides that by 60
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+    // Answer: This will display the movie length formatted in hours, minutes and seconds, it can be named totalTime
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+    // Answer: Yes it works with all values, this can be because there are template litterals in the result variable 

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

@@ -1,19 +1,12 @@
 const penceString = "399p";
 
-const penceStringWithoutTrailingP = penceString.substring(
-  0,
-  penceString.length - 1
-);
+const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1);
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
-const pounds = paddedPenceNumberString.substring(
-  0,
-  paddedPenceNumberString.length - 2
-);
 
-const pence = paddedPenceNumberString
-  .substring(paddedPenceNumberString.length - 2)
-  .padEnd(2, "0");
+const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
+
+const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
 
 console.log(`£${pounds}.${pence}`);
 
@@ -25,3 +18,16 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// 2. penceStringWithoutTrailingP the last "p" from line 1 is removed
+  // substring() method will select a charactor from index 0 to -1, and return the new string "-1 is the last charactor" then we get "399"
+
+// 3. paddedPenceNumberString  this is assingned to the variable penceStringWithoutTrailingP where a charactor is added to the beggining of the string by the method padStart
+  // 3 will add 2 zeros to the begining of the string, we have padStart(3, "0") and we already have three charactor 
+  // if it was padStart(4, "0") then the result was "0399"
+
+// 4. pounds will take the paddedPenceNumberString, select all the charactors exept the last two
+
+// 5. pence selects the values in paddedPenceNumberString, then makes sure we have the last we have two digits at the end
+
+// console will print the output value in pounds