From eafb19f4002f316ff7837e112d42a44a60dc44e0 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Thu, 5 Feb 2026 21:28:30 +0200 Subject: [PATCH 01/15] Solution: key-exercises 1, count --- Sprint-1/1-key-exercises/1-count.js | 1 + 1 file changed, 1 insertion(+) diff --git a/Sprint-1/1-key-exercises/1-count.js b/Sprint-1/1-key-exercises/1-count.js index 117bcb2b6..b64e62395 100644 --- a/Sprint-1/1-key-exercises/1-count.js +++ b/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: Line 3 reassigns the value of count by increasing it by 1. It therefore increases the value of count from 0 to 1 From d1c151acdffb206d069c4f5f7bbf68653190385c Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Thu, 5 Feb 2026 21:48:04 +0200 Subject: [PATCH 02/15] Solution: key-exercises 2, initials --- Sprint-1/1-key-exercises/2-initials.js | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/Sprint-1/1-key-exercises/2-initials.js b/Sprint-1/1-key-exercises/2-initials.js index 47561f617..8f4624fc1 100644 --- a/Sprint-1/1-key-exercises/2-initials.js +++ b/Sprint-1/1-key-exercises/2-initials.js @@ -5,7 +5,17 @@ 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 = ``; +function getInitials(names) { + let initials = ""; + for (const name of names) { + initials += name.charAt(0) + } + + return initials +} + +let initials = getInitials([firstName, middleName, lastName]); +console.log(initials) // https://www.google.com/search?q=get+first+character+of+string+mdn From a7fa5eb3f2fd16484be7fbc82ab97289e847d1b7 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:01:12 +0200 Subject: [PATCH 03/15] Solution: key-exercises 3, paths --- Sprint-1/1-key-exercises/3-paths.js | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Sprint-1/1-key-exercises/3-paths.js b/Sprint-1/1-key-exercises/3-paths.js index ab90ebb28..b96e4cd6a 100644 --- a/Sprint-1/1-key-exercises/3-paths.js +++ b/Sprint-1/1-key-exercises/3-paths.js @@ -17,7 +17,7 @@ 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); +const ext = base.slice(base.lastIndexOf(".") + 1); // https://www.google.com/search?q=slice+mdn \ No newline at end of file From 09b393415f9bada87be08a1506d33fbb1385bee1 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:08:37 +0200 Subject: [PATCH 04/15] Solution: key-exercises 4, random --- Sprint-1/1-key-exercises/4-random.js | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Sprint-1/1-key-exercises/4-random.js b/Sprint-1/1-key-exercises/4-random.js index 292f83aab..ba1e8b7d6 100644 --- a/Sprint-1/1-key-exercises/4-random.js +++ b/Sprint-1/1-key-exercises/4-random.js @@ -7,3 +7,5 @@ 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: num represents a random integer between 1 and 100 (inclusive). \ No newline at end of file From f5db08b2fa7ec92a92a7fc42fbc9617ad7935dc9 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:10:17 +0200 Subject: [PATCH 05/15] Solution: mandatory-errors, 0 --- 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..6a7a7f690 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? \ No newline at end of file From 5c7e6f314e7c41087699b0443ebdd565b4e33b1c Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:12:02 +0200 Subject: [PATCH 06/15] Solution: mandatory-errors, 1 --- 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 27d4549b5e33e9f82c3d4686c039f3e125861a3e Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:13:09 +0200 Subject: [PATCH 07/15] Solution: mandatory-errors, 2 --- 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 cc8fcda1c22b4fd03ebfe8d56f8f8e3eccc8995b Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:26:17 +0200 Subject: [PATCH 08/15] Solution: mandatory-errors, 3 --- Sprint-1/2-mandatory-errors/3.js | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js index ec101884d..8d5d0ca93 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 +7,9 @@ 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 + +// Prediction: running this will generate an error. This is because the slice method is a string method, +// so it only works on strings. However, the cardNumber variable is an integer. To correct this, we +// need to caste this integer into an string. + +console.log(last4Digits); From 9a5e7919076b3e4fd81002cea71ba14c8924b149 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:27:07 +0200 Subject: [PATCH 09/15] Solution: mandatory-errors, 3 --- Sprint-1/2-mandatory-errors/3.js | 2 -- 1 file changed, 2 deletions(-) diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js index 8d5d0ca93..283b310c5 100644 --- a/Sprint-1/2-mandatory-errors/3.js +++ b/Sprint-1/2-mandatory-errors/3.js @@ -11,5 +11,3 @@ const last4Digits = cardNumber.toString().slice(-4); // Prediction: running this will generate an error. This is because the slice method is a string method, // so it only works on strings. However, the cardNumber variable is an integer. To correct this, we // need to caste this integer into an string. - -console.log(last4Digits); From 0997be98a8a938c22e25d7ae6dfc808c9e9a3cf0 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:34:06 +0200 Subject: [PATCH 10/15] Solution: mandatory-errors, 4 --- 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..3009b4b97 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 clock_12H = "08:53 PM"; +const clock_24H = "20:53"; From 6660e35a86dfa4f8967bb23646ab8ae1583bd795 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:46:43 +0200 Subject: [PATCH 11/15] Solution: mandatory-interpret, 1 --- Sprint-1/3-mandatory-interpret/1-percentage-change.js | 9 ++++++++- 1 file changed, 8 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..4ab314883 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 +12,18 @@ 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 +// Answer: 4 in total (on lines 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? +// Prediction: it will generate an error. This is because the replaceAll function isn't syntactically correct as there is a comma separator missing +// After running: error identified on Line 5 (priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));) // c) Identify all the lines that are variable reassignment statements +// Answer: Lines 4 and 5 // d) Identify all the lines that are variable declarations +// Answer: Lines 1, 2, 7, and 8 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression? +// Answer: It takes the string and replaces all instances of the comma "," with an empty space "". For example, the string "10,000,000" +// gets turned to "10000000" From 4ad249486fb7277a85798d3985ca110aaaeee629 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:53:29 +0200 Subject: [PATCH 12/15] Solution: mandatory-interpret, 1 --- Sprint-1/3-mandatory-interpret/1-percentage-change.js | 2 +- 1 file changed, 1 insertion(+), 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 4ab314883..1d37a4387 100644 --- a/Sprint-1/3-mandatory-interpret/1-percentage-change.js +++ b/Sprint-1/3-mandatory-interpret/1-percentage-change.js @@ -12,7 +12,7 @@ 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 -// Answer: 4 in total (on lines 4 and 5) +// Answer: 5 in total (on 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? // Prediction: it will generate an error. This is because the replaceAll function isn't syntactically correct as there is a comma separator missing From 6ddb5689caa80a3cfaf2956f94d0174a87c6b50c Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 04:58:05 +0200 Subject: [PATCH 13/15] Solution: mandatory-interpret, 1-percentage-change --- Sprint-1/3-mandatory-interpret/1-percentage-change.js | 2 +- 1 file changed, 1 insertion(+), 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 1d37a4387..5ce6b28d1 100644 --- a/Sprint-1/3-mandatory-interpret/1-percentage-change.js +++ b/Sprint-1/3-mandatory-interpret/1-percentage-change.js @@ -12,7 +12,7 @@ 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 -// Answer: 5 in total (on lines 4, 5, and 10) +// Answer: 6 in total (on 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? // Prediction: it will generate an error. This is because the replaceAll function isn't syntactically correct as there is a comma separator missing From c09b8c76aa04a22c31fe9d255dc305e293489e60 Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 05:10:57 +0200 Subject: [PATCH 14/15] Solution: mandatory-interpret, 2-time-format --- Sprint-1/3-mandatory-interpret/2-time-format.js | 8 +++++++- 1 file changed, 7 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..84df226c1 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 = -9.5; // 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: 6 in total (on lines 1, 3, 4, 6, and 7) // b) How many function calls are there? +// Answer: 3 (on 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 +// Answer: It returns the modulus (i.e. remainder) of a division // d) Interpret line 4, what does the expression assigned to totalMinutes mean? +// Answer: It's the floor of the movie runtime in minutes // e) What do you think the variable result represents? Can you think of a better name for this variable? +// Answer: it's the formatted runtime of the movie (in Hours:Minutes:Seconds). A better name could be formattedRuntime // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer +// Answer: It won't work for all values, for example strings From 9c357138fa55956c2be5d7d97d90c22031540a1e Mon Sep 17 00:00:00 2001 From: Isaac Abodunrin Date: Fri, 6 Feb 2026 16:45:56 +0200 Subject: [PATCH 15/15] Solution: mandatory-interpret, 3-to-pounds --- Sprint-1/3-mandatory-interpret/3-to-pounds.js | 22 +++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/Sprint-1/3-mandatory-interpret/3-to-pounds.js b/Sprint-1/3-mandatory-interpret/3-to-pounds.js index 60c9ace69..58c15578c 100644 --- a/Sprint-1/3-mandatory-interpret/3-to-pounds.js +++ b/Sprint-1/3-mandatory-interpret/3-to-pounds.js @@ -23,5 +23,23 @@ console.log(`£${pounds}.${pence}`); // You need to do a step-by-step breakdown of each line in this program // Try and describe the purpose / rationale behind each step -// To begin, we can start with -// 1. const penceString = "399p": initialises a string variable with the value "399p" +// Step 1: initialize the string variable penceString with the value "399p" +// const penceString = "399p"; + +// Step 2: Remove the "p" from the end of "399p" and store the value to penceStringWithoutTrailingP +// const penceStringWithoutTrailingP = penceString.substring(0,penceString.length - 1); + +// Step 3: The padStart method is used to ensure that the paddedPenceNumberString string variable has at least 3 +// characters, padding it with "0" at the start if necessary. Since paddedPenceNumberString is already 3 characters +// long, no padding is added. +// const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); + +// Step 4: The substring method is used to extract the pounds part of the price and store it in the variable pounds. +// const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2); + +// Step 5: The substring method is used to extract the pence part of the price and store it in the variable pence. +// It uses the padEnd method to ensure that the pence string has at least 2 characters, padding it with "0" at the end if necessary. +// const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"); + +// Step 6: The console.log method is used to output the final price in pounds and pence format. +// console.log(`£${pounds}.${pence}`);