London | Jan2026 | Ihor Taradaiko | Sprint 1 | Coursework/sprint 1

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

@@ -2,5 +2,10 @@ 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
+//It takes the current value of count, add 1 to it
+//The one-word programming term is increment.

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 = `${firstName.charAt(0)}${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

@@ -16,8 +16,9 @@ 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 lastDotIndex = filePath.lastIndexOf(".");
+const dir = filePath.slice(0, lastSlashIndex);
+const ext = filePath.slice(lastDotIndex);
+console.log(dir,ext)
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -2,8 +2,14 @@ const minimum = 1;
 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
+//results: 4,23,91,46 the program is giving you a random number while math.random give you a random decimal number math.floor rounds the total number up
+// 1. Math.random() - should produce random decimal number [0,1)
+// 2. Math.random() * (maximum - minimum + 1) - should produce [0,1) * (100-1+1)
+// 3. Math.floor(Math.random() * (maximum - minimum + 1)) - Math.floor() rounds down to the nearest integer so it won't be 88.88 but just 88
+// 4. Math.floor(Math.random() * (maximum - minimum + 1)) + minimum - adds minumin to have an integer between 1 and 100 inclusive. [0,100]

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

@@ -1,2 +1,3 @@
-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?
+// comment them

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;
+age = age+1
+console.log(age)
+
+//const sets the value as a constant you can't change

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 ?
-
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+//wrong order

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

@@ -1,9 +1,13 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
-
+function digits() {
+  const cardNumber = 4533787178994213;
+  const last4Digits = String(cardNumber).slice(-4);
+  return last4Digits;
+}console.log(digits())
 // 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
+
+//Numbers don’t have .slice(), so we convert the number to a string

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

@@ -1,2 +1,9 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+// const 12HourClockTime = "20:53";
+// const 24hourClockTime = "08:53";
+
+//answer
+
+const hourClockTime24 = "20:53";
+const hourClockTime12 = "08:53";
+
+// you can't start a parameter with the number, also the values did not match logically to the parameter

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 +12,12 @@ 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
-
+//4,5,10 (five)
 // 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?
-
+//line 5, added come before ""
 // c) Identify all the lines that are variable reassignment statements
-
+//4,5
 // d) Identify all the lines that are variable declarations
-
+//1,2,7,8
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//removes commas / Converts the string "10000" into the number

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 2600; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +12,16 @@ 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?
-
+//6
 // 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
+//The remainder (%) operator returns the remainder left over when one operand is divided by a second operand. It always takes the sign of the dividend.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+//The total number of whole minutes in the movie
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+//timeInHMS
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//

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

@@ -1,21 +1,23 @@
 const penceString = "399p";
-
+// 1. const penceString = "399p": initialises a string variable with the value "399p"
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
-
+//2. removes "P" from the string
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//3. Ensures the string is at least 3 characters long by adding 0 to the start
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
-
+//4. Extracts everything except the last 2 digits of paddedPenceNumberString
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
-  .padEnd(2, "0");
-
+  // .padEnd(2, "0");
+//5. takes the last 2 digits as the pence from paddedPenceNumberString
 console.log(`£${pounds}.${pence}`);
+//6. Prints the formatted pounds-and-pence value
 
 // This program takes a string representing a price in pence
 // The program then builds up a string representing the price in pounds

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

@@ -11,8 +11,8 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
-
+//Shows an alert
 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`?
+//shows a pop-up to enter a name / stores and shows name
+What effect does calling the `prompt` function have? //shows pop-up form
+What is the return value of `prompt`? //if myName is set returns myName value (It returns the text that the user types into the input box.)

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

@@ -4,13 +4,15 @@ 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?// ƒ log() { [native code] }
 
 Now enter just `console` in the Console, what output do you get back?
-
+// console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
 Try also entering `typeof console`
-
+// 'object'
 Answer the following questions:
 
 What does `console` store?
+//stores an object that contains lots of built-in debugging functions
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+//means “get the log (or assert) property from the console object”