From b975ffa37a44c05711293f3e753aa5e85248586f Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 02:24:22 +0000 Subject: [PATCH 01/15] Initial commit --- Sprint-1/1-key-exercises/1-count.js | 4 ++++ prep/prep-sprint-1.js | 17 +++++++++++++++++ 2 files changed, 21 insertions(+) create mode 100644 prep/prep-sprint-1.js diff --git a/Sprint-1/1-key-exercises/1-count.js b/Sprint-1/1-key-exercises/1-count.js index 117bcb2b6..05eb3385d 100644 --- a/Sprint-1/1-key-exercises/1-count.js +++ b/Sprint-1/1-key-exercises/1-count.js @@ -4,3 +4,7 @@ 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 updating the value of the count variable by adding 1 to its current value. The = operator is an assignment operator that assigns the result of the expression on the right (count + 1) to the variable on the left (count). +// So after line 3 executes, count will have a new value of 1. +// = does not mean “equal to” (as in math); it means “take the value on the right and store it in the variable on the left.” diff --git a/prep/prep-sprint-1.js b/prep/prep-sprint-1.js new file mode 100644 index 000000000..9e1e24120 --- /dev/null +++ b/prep/prep-sprint-1.js @@ -0,0 +1,17 @@ +// 1.Write a function that will calculate the area of a rectangle. The function should take two parameters: length and width. It should return the area of the rectangle. + +function calculateArea(length, width) { + const area = length * width; + return area; +} + +console.log(calculateArea(3, 4)); // Output: 12 + +// 2.Write a function that will capitalize the first letter in a given string. + +function capitalizeFirstLetter(name) { + const result = name[0].toUpperCase() + name.slice(1); + return result; +} + +console.log(capitalizeFirstLetter("mario")); // Output: "Mario" From 8f8263e23c0e04d046ca4f4365397b9e6ba5f0fc Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 02:31:24 +0000 Subject: [PATCH 02/15] Solved 2-initials.js --- Sprint-1/1-key-exercises/2-initials.js | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/Sprint-1/1-key-exercises/2-initials.js b/Sprint-1/1-key-exercises/2-initials.js index 47561f617..9e3f35ef8 100644 --- a/Sprint-1/1-key-exercises/2-initials.js +++ b/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); // Output: "CKJ" +// https://www.google.com/search?q=get+first+character+of+string+mdn From 1473a63b797399ff8f05d0fb1df38c055f17829a Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 15:55:48 +0000 Subject: [PATCH 03/15] Solved 3-paths.js --- Sprint-1/1-key-exercises/3-paths.js | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/Sprint-1/1-key-exercises/3-paths.js b/Sprint-1/1-key-exercises/3-paths.js index ab90ebb28..9fbdd16a9 100644 --- a/Sprint-1/1-key-exercises/3-paths.js +++ b/Sprint-1/1-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(".")); -// https://www.google.com/search?q=slice+mdn \ No newline at end of file +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 From 492c04f4b08cad94d0fbc6763f58e715327ef785 Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 16:24:28 +0000 Subject: [PATCH 04/15] Solved 4-random.js --- Sprint-1/1-key-exercises/4-random.js | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/Sprint-1/1-key-exercises/4-random.js b/Sprint-1/1-key-exercises/4-random.js index 292f83aab..bf246f3d1 100644 --- a/Sprint-1/1-key-exercises/4-random.js +++ b/Sprint-1/1-key-exercises/4-random.js @@ -7,3 +7,22 @@ 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 + +console.log(`Random number between ${minimum} and ${maximum}: ${num}`); + +console.log( + "Random number between 0 and 1 after evaluating Math.random() is: ", + Math.random() +); +console.log( + "Math.random() * (maximum - minimum + 1) scales the range from 1 to 100 (100 isn't included) for the random number: ", + Math.random() * (maximum - minimum + 1) +); +console.log( + "Math.floor(Math.random() * (maximum - minimum + 1)) rounds down the random number: ", + Math.floor(Math.random() * (maximum - minimum + 1)) +); +console.log( + "(Math.floor(Math.random() * (maximum - minimum + 1)) + minimum) shifts the range to 1–100 (100 is included): ", + Math.floor(Math.random() * (maximum - minimum + 1)) + minimum +); From 3eb841041a78db668ab189812840173abb8be518 Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 16:26:54 +0000 Subject: [PATCH 05/15] Solved mandatory-errors/0.js --- Sprint-1/2-mandatory-errors/0.js | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Sprint-1/2-mandatory-errors/0.js b/Sprint-1/2-mandatory-errors/0.js index cf6c5039f..044add7ac 100644 --- a/Sprint-1/2-mandatory-errors/0.js +++ b/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? \ No newline at end of file +// 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? From ee3a0b11dc6b05784848e226106aaabbda173d18 Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 16:28:26 +0000 Subject: [PATCH 06/15] Solved mandatory-errors/1.js --- Sprint-1/2-mandatory-errors/1.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Sprint-1/2-mandatory-errors/1.js b/Sprint-1/2-mandatory-errors/1.js index 7a43cbea7..031839b47 100644 --- a/Sprint-1/2-mandatory-errors/1.js +++ b/Sprint-1/2-mandatory-errors/1.js @@ -1,4 +1,4 @@ // trying to create an age variable and then reassign the value by 1 -const age = 33; +let age = 33; age = age + 1; From 94fb26cbeac6398289b8b0efde6f8ddc126c9820 Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 16:29:32 +0000 Subject: [PATCH 07/15] Solved mandatory-errors/2.js --- Sprint-1/2-mandatory-errors/2.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Sprint-1/2-mandatory-errors/2.js b/Sprint-1/2-mandatory-errors/2.js index e09b89831..2865eb8a4 100644 --- a/Sprint-1/2-mandatory-errors/2.js +++ b/Sprint-1/2-mandatory-errors/2.js @@ -1,5 +1,5 @@ // 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}`); From b64a8f66a8e5155e1995ce3bd4ccfc68aec533ce Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 16:33:42 +0000 Subject: [PATCH 08/15] Solved mandatory-errors/3.js --- Sprint-1/2-mandatory-errors/3.js | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js index ec101884d..56d703c3b 100644 --- a/Sprint-1/2-mandatory-errors/3.js +++ b/Sprint-1/2-mandatory-errors/3.js @@ -1,5 +1,5 @@ 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 @@ -7,3 +7,4 @@ const last4Digits = cardNumber.slice(-4); // 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(`The last 4 digits of the card number are: ${last4Digits}`); From e9b50c2a42d3f78abe8c2f3ec22b432d2d3d6bb6 Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 16:36:32 +0000 Subject: [PATCH 09/15] Solved mandatory-errors/4.js --- Sprint-1/2-mandatory-errors/4.js | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Sprint-1/2-mandatory-errors/4.js b/Sprint-1/2-mandatory-errors/4.js index 21dad8c5d..df1553660 100644 --- a/Sprint-1/2-mandatory-errors/4.js +++ b/Sprint-1/2-mandatory-errors/4.js @@ -1,2 +1,2 @@ -const 12HourClockTime = "20:53"; -const 24hourClockTime = "08:53"; \ No newline at end of file +const _12HourClockTime = "20:53"; +const hour24ClockTime = "08:53"; From bbf4e20ecc30c558e6276b0f2a98eee5945606b5 Mon Sep 17 00:00:00 2001 From: Konvaly Date: Thu, 30 Oct 2025 23:30:24 +0000 Subject: [PATCH 10/15] Solved mandatory-interpret/1-percentage-change.js --- .../3-mandatory-interpret/1-percentage-change.js | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/Sprint-1/3-mandatory-interpret/1-percentage-change.js b/Sprint-1/3-mandatory-interpret/1-percentage-change.js index e24ecb8e1..d7319eb98 100644 --- a/Sprint-1/3-mandatory-interpret/1-percentage-change.js +++ b/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 +12,23 @@ 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 +// Line 4: Number(), carPrice.replaceAll(",", "") - 2 function calls +// Line 5: Number(), priceAfterOneYear.replaceAll(",", "") - 2 function calls +// Line 10: console.log() - 1 function call +// In total: 5 function calls // 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? +// Its line 5 - missed comma in replaceAll method. Fixed now - added comma after the first parameter. // c) Identify all the lines that are variable reassignment statements +// Line 4: carPrice = Number(carPrice.replaceAll(",", "")); +// Line 5: priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", "")); // d) Identify all the lines that are variable declarations +// Line 1: let carPrice = "10,000"; +// Line 2: let priceAfterOneYear = "8,543"; +// Line 7: const priceDifference = carPrice - priceAfterOneYear; +// Line 8: const percentageChange = (priceDifference / carPrice) * 100; // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression? +// This expression transforms data type from String to Number and removes all commas from the String value of carPrice, so "10,000" becomes "10000". From 85635a5ffef2e74edb42eb4dc343b3621e891991 Mon Sep 17 00:00:00 2001 From: Konvaly Date: Fri, 31 Oct 2025 00:14:30 +0000 Subject: [PATCH 11/15] Solved mandatory-interpret/2-time-format.js --- Sprint-1/3-mandatory-interpret/2-time-format.js | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/Sprint-1/3-mandatory-interpret/2-time-format.js b/Sprint-1/3-mandatory-interpret/2-time-format.js index 47d239558..c0b701a91 100644 --- a/Sprint-1/3-mandatory-interpret/2-time-format.js +++ b/Sprint-1/3-mandatory-interpret/2-time-format.js @@ -1,4 +1,4 @@ -const movieLength = 8784; // length of movie in seconds +const movieLength = 8468; // length of movie in seconds const remainingSeconds = movieLength % 60; const totalMinutes = (movieLength - remainingSeconds) / 60; @@ -12,14 +12,25 @@ 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 are 6 variable declarations: movieLength, remainingSeconds, totalMinutes, remainingMinutes, totalHours, and result. // b) How many function calls are there? +// 1 function call: console.log(result); // c) Using documentation, explain what the expression movieLength % 60 represents // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators +// This expression calculates the remainder or modulo when movieLength (in seconds) is divided by 60. This gives the number of seconds remaining after converting the total seconds into full minutes. // d) Interpret line 4, what does the expression assigned to totalMinutes mean? +// It means the total number of full minutes in the movie length. It subtracts the remaining seconds from the total movie length and then divides that value by 60 to convert it from seconds to minutes. // e) What do you think the variable result represents? Can you think of a better name for this variable? +// It represents the formatted string of the movie length in hours, minutes and seconds. A better name could be formattedMovieTime or durationMovieFormatted. // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer +//Code works correctly, but there are few edge cases to consider: +// 1. If movieLength is negative, the output won't make sense in the context of time duration. +// 2. If movieLength is a very large number the output'll still be correct, but not readable - "1.7968563299644136e+35:4:52" +// 3. If movieLength is zero, the output will be "0:0:0", which is valid but may not be the desired format for representing zero duration. +// 4. If movieLength is not an integer like floating-point number, the calculations may yield unexpected results - "2:21:8.299999999999272" since time is typically represented in whole seconds. +// 5. When hours, minutes or seconds are single digits (1:5:3) the output may not be in the desired format with 2digits - "01:05:03". From 4f7798d904c3cd91fdf9f64191a8ca67f7fdbb6c Mon Sep 17 00:00:00 2001 From: Konvaly Date: Fri, 31 Oct 2025 00:38:25 +0000 Subject: [PATCH 12/15] Solved mandatory-interpret/3-to pounds.js --- Sprint-1/3-mandatory-interpret/3-to-pounds.js | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/Sprint-1/3-mandatory-interpret/3-to-pounds.js b/Sprint-1/3-mandatory-interpret/3-to-pounds.js index 60c9ace69..150c78a67 100644 --- a/Sprint-1/3-mandatory-interpret/3-to-pounds.js +++ b/Sprint-1/3-mandatory-interpret/3-to-pounds.js @@ -24,4 +24,9 @@ console.log(`£${pounds}.${pence}`); // Try and describe the purpose / rationale behind each step // To begin, we can start with -// 1. const penceString = "399p": initialises a string variable with the value "399p" +// 1. const penceString = "399p": initializes a string variable with the value "399p" +// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): creates a copy of the penceString and method substring() removes the last character 'p', using the length of the original string minus 1 as the endpoint +// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): ensures that the string has at least 3 characters, if not - adds zeros to the start of the string until it reaches that length. Method padStart() is used for this purpose - padStart(targetLength, padString), where targetLength is 3 and padString is "0". If string is already 3 or more characters long, no symbol is added. +// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): extracts the pounds from the paddedPenceNumberString by taking all characters except the last two, using substring() method with the endpoint set to the length of the string minus 2 +// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): extracts the last two characters with method substring() from the paddedPenceNumberString to represent the pence (starting index set to the length of the string minus 2). Then, padEnd(2, "0") ensures that the resulting string has at least 2 characters, adding a trailing zero if necessary. +// 6. console.log(`£${pounds}.${pence}`): outputs the formatted amount of money/price in pounds and pence to the console, using template literals for nice readable view (it allowed combining the pounds and pence with the appropriate currency symbol and decimal point. From a7f84c367d066a4d0bd5c4c7e3187cfdae9d905f Mon Sep 17 00:00:00 2001 From: Konvaly Date: Fri, 31 Oct 2025 01:01:09 +0000 Subject: [PATCH 13/15] Answered 4-stretch-explore/chrome.md --- Sprint-1/4-stretch-explore/chrome.md | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/Sprint-1/4-stretch-explore/chrome.md b/Sprint-1/4-stretch-explore/chrome.md index e7dd5feaf..3b04158af 100644 --- a/Sprint-1/4-stretch-explore/chrome.md +++ b/Sprint-1/4-stretch-explore/chrome.md @@ -12,7 +12,14 @@ invoke the function `alert` with an input string of `"Hello world!"`; What effect does calling the `alert` function have? +- It shows a modal pop-up box. + 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`? + +- The browser shows the pop-up dialogue box with the question `"What is your name?"`, two buttons "Cancel" and "Ok" and text input field where user can type their name + +## What is the return value of `prompt`? + +- If user typed something in the text input field that'll be the return value with data type String, even if user typed numbers. If user pressed "Cancel" button, then value'll be null. From 157a8ce619b0f0d86e4eafdcc88b8741f96c6def Mon Sep 17 00:00:00 2001 From: Konvaly Date: Fri, 31 Oct 2025 01:08:42 +0000 Subject: [PATCH 14/15] Answered 4-stretch-explore/objects.md --- Sprint-1/4-stretch-explore/objects.md | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/Sprint-1/4-stretch-explore/objects.md b/Sprint-1/4-stretch-explore/objects.md index 0216dee56..2b1ca1cb8 100644 --- a/Sprint-1/4-stretch-explore/objects.md +++ b/Sprint-1/4-stretch-explore/objects.md @@ -6,11 +6,20 @@ Open the Chrome devtools Console, type in `console.log` and then hit enter 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` Answer the following questions: What does `console` store? -What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean? + +- It stores functions/methods + What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean? + - `console.log` means “get the log property from the console object.” + - `console.assert` means “get the assert property from the console object.” + - `.` is the property access operator, it lets us access specific functions or values that belong to an object. From 8a0ebbbe4b108703153a851f5009a44aafdebaa3 Mon Sep 17 00:00:00 2001 From: Konvaly Date: Sat, 1 Nov 2025 00:52:55 +0000 Subject: [PATCH 15/15] Fixed task 4-stretch-explore/chrome.md --- Sprint-1/4-stretch-explore/chrome.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Sprint-1/4-stretch-explore/chrome.md b/Sprint-1/4-stretch-explore/chrome.md index 3b04158af..a862453f7 100644 --- a/Sprint-1/4-stretch-explore/chrome.md +++ b/Sprint-1/4-stretch-explore/chrome.md @@ -12,7 +12,7 @@ invoke the function `alert` with an input string of `"Hello world!"`; What effect does calling the `alert` function have? -- It shows a modal pop-up box. +- It shows a modal pop-up box with phrase `"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`. @@ -22,4 +22,4 @@ What effect does calling the `prompt` function have? ## What is the return value of `prompt`? -- If user typed something in the text input field that'll be the return value with data type String, even if user typed numbers. If user pressed "Cancel" button, then value'll be null. +- If user typed something in the text input field - that'll be the return value with data type String, even if user typed numbers. If user pressed "Cancel" button, then value'll be null. If user pressed "Ok" button but didn't type anytning then value'll be an empty string - ""