Brussels | ITP-2025-1 | Preeti Tyagi | Week 4 |Sprint 1 Exercises

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

@@ -3,4 +3,4 @@ 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
+//Line 3 is adding 1 to the current value of count and stores the result back into count

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 = `${firstName[0]}${middleName[0]}${lastName[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 +10,19 @@
 // (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 where the last slash is — that’s the boundary between the directory and the file
 const lastSlashIndex = filePath.lastIndexOf("/");
+
+// The "base" is everything after the last slash
 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
 
-const dir = ;
-const ext = ;
+const dir = filePath.slice(0, lastSlashIndex); // everything before the last slash
+const ext = base.slice(base.lastIndexOf(".")); // everything after the last dot, including the dot
 
-// https://www.google.com/search?q=slice+mdn
+console.log(`The dir part of ${filePath} is ${dir}`);
+console.log(`The ext part of ${filePath} is ${ext}`);

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

@@ -1,9 +1,7 @@
 const minimum = 1;
 const maximum = 100;
 
+// Generate a random integer between minimum and maximum (inclusive)
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
-// 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
+console.log(`The random number is: ${num}`);

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

@@ -1,2 +1,4 @@
-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?
+
+ //added // sign in begining of each comment to make sure that its is a comment not a part of the code.

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

@@ -1,4 +1,7 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
-age = age + 1;
+let age = 33;   // use 'let' instead of 'const'
+age = age + 1;  // reassigns 'age' by adding 1
+
+console.log(age);
+

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

@@ -1,5 +1,4 @@
-// Currently trying to print the string "I was born in Bolton" but it isn't working...
-// what's the error ?
+const cityOfBirth = "Bolton";           // declared and initialized
+console.log(`I was born in ${cityOfBirth}`);  // variable now accessible
 
-console.log(`I was born in ${cityOfBirth}`);
-const cityOfBirth = "Bolton";
+//Fixed Execution Order

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

@@ -1,9 +1,7 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().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
-// 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
+console.log(last4Digits); 
+
+// Output: "4213"
+//converted the number to a string to make slice out of it

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const hour12ClockTime = "08:53 PM"; // 12-hour format should include AM/PM
+const hour24ClockTime = "20:53";    // 24-hour format

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

@@ -1,22 +1,12 @@
 let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
+// Remove commas and convert strings to numbers
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
+// Calculate price difference and percentage change
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
 
-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
-
-// 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?
-
-// c) Identify all the lines that are variable reassignment statements
-
-// d) Identify all the lines that are variable declarations
-
-// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+console.log(`The percentage change is ${percentageChange}%`);

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

@@ -1,25 +1,20 @@
 const movieLength = 8784; // length of movie in seconds
 
+// Calculate remaining seconds after converting to minutes
 const remainingSeconds = movieLength % 60;
+
+// Total minutes (integer division)
 const totalMinutes = (movieLength - remainingSeconds) / 60;
 
+// Calculate remaining minutes after converting to hours
 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?
-
-// b) How many function calls are there?
-
-// c) Using documentation, explain what the expression movieLength % 60 represents
-// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// Total hours (integer division)
+const totalHours = (totalMinutes - remainingMinutes) / 60;
 
-// d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// Format the result as "hours:minutes:seconds"
+const movieDuration = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
 
-// e) What do you think the variable result represents? Can you think of a better name for this variable?
+console.log(movieDuration);
 
-// f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//6 variable declaration and 1 function call done

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

@@ -1,27 +1,25 @@
+// 1️⃣ Initialize a string representing a price in pence, ending with 'p'
 const penceString = "399p";
 
+// 2️⃣ Remove the trailing "p" from the string
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
 
+// 3️⃣ Pad the number string on the left with zeros to ensure it has at least 3 digits
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+
+// 4️⃣ Extract the pounds part (all digits except the last 2)
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
 
+// 5️⃣ Extract the pence part (the last 2 digits) and pad it on the right if needed
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
 
+// 6️⃣ Build the final formatted price string in pounds and pence
 console.log(`£${pounds}.${pence}`);
-
-// This program takes a string representing a price in pence
-// The program then builds up a string representing the price in pounds
-
-// You need to do a step-by-step breakdown of each line in this program
-// 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"

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

@@ -10,9 +10,10 @@ Let's try an example.
 In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
-What effect does calling the `alert` function have?
+What effect does calling the `alert` function have?  It pops up a small alert tab mentioning `"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`.
+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`.
 
-What effect does calling the `prompt` function have?
-What is the return value of `prompt`?
+What effect does calling the `prompt` function have? In this pop up tab I now see a prompt `" What is your name"` and under it an empty input space to add `my name`. 
+
+What is the return value of `prompt`?  It is empty if I don't input my name.

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

@@ -4,13 +4,19 @@ 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?
+What output do you get? I get : ƒ log() { [native code] }
 
 Now enter just `console` in the Console, what output do you get back?
 
-Try also entering `typeof console`
+Try also entering `typeof console` I get : `object`
 
 Answer the following questions:
 
 What does `console` store?
-What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+Console is an object that holds many `methods` and `functions`.
+
+What does the syntax `console.log` or `console.assert` mean?
+console.log means `"use the log method from the console object.”`
+
+In particular, what does the `.` mean?
+The dot means “go inside this object and grab this property or method.”