From 3f9358ca34418b4c498871abc8f2e83ce9ab1f20 Mon Sep 17 00:00:00 2001
From: Diana <40689028+ausiejute@users.noreply.github.com>
Date: Sun, 27 Sep 2026 22:49:36 +0100
Subject: [PATCH 1/8] Complete all mandatory-debug exercises

---
 Sprint-3/1-key-errors/0.js      | 15 +++++++++++----
 Sprint-3/1-key-errors/1.js      | 13 +++++++++----
 Sprint-3/1-key-errors/2.js      |  6 ++++--
 Sprint-3/2-mandatory-debug/0.js | 12 ++++++++++--
 Sprint-3/2-mandatory-debug/1.js |  8 ++++++++
 Sprint-3/2-mandatory-debug/2.js | 20 ++++++++++++++++++--
 6 files changed, 60 insertions(+), 14 deletions(-)

diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 653d6f5a0..17b65d00b 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -1,13 +1,20 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> If the function will be called, it will print the first letter of the string
+// in capital with the rest of the word in lowercase
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
-function capitalise(str) {
+/* function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
+} */
+
+// =============> A SyntaxError was thrown because the str was used to name both the function parameter
+// and a new variable, which cannot happen in the same scope
+// =============>
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+console.log(capitalise("mother"));
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index f2d56151f..68ccc25d1 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -1,20 +1,25 @@
 // Predict and explain first...
+// There will be another syntax error, because the same name is used for both the parameter and the variable
+// (decimalNumber)
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============>
+// We cannot redeclare a variable with the same name in the same scope.
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
+/* function convertToPercentage(decimalNumber) {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
-
-console.log(decimalNumber);
+*/
 
 // =============> write your explanation here
+// We create a function that takes a decimal number as a parameter, then declare a variable and assign value to it,
+// then create a variable named "percentage", the value of which is calculated by calculating the decimal number
+// and multiplying it by 100. Finally, we return the output - percentage.
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index aad57f7cf..d33fc6fab 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -4,17 +4,19 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// I predict it will say 'num is not defined'
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
-
+// SyntaxError: Unexpected number
 // =============> explain this error message here
-
+// 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
 
+console.log(square(3));
\ No newline at end of file
diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index b27511b41..9d8d9c0f0 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -1,6 +1,7 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============>
+// Variables haven't been declared, so it will throw a reference error
 
 function multiply(a, b) {
   console.log(a * b);
@@ -9,6 +10,13 @@ function multiply(a, b) {
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
-
+// It printed 32 because that particular console function is inside the multiply function (local), whereas the other one
+// is outside the scope and when we call the multiply function it comes up as undefined because nothing has been returned
+// inside of it.
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+/* function multiply(a, b) {
+  return a * b;
+}
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`); */
diff --git a/Sprint-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 37cedfbcf..eb918729b 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,13 +1,21 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// it will print the following: `The sum of 10 and 32 is undefined'
 
+/*
 function sum(a, b) {
   return;
   a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+*/
 
 // =============> write your explanation here
+// the function sum doesn't return any value. The arithmetic operation doesn't execute because it's defined after 'return'
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum(a, b) {
+  return a + b;
+}
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
diff --git a/Sprint-3/2-mandatory-debug/2.js b/Sprint-3/2-mandatory-debug/2.js
index 57d3f5dc3..fad01d643 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -2,8 +2,8 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
-
-const num = 103;
+// it will not print the correct last digits
+/*const num = 103;
 
 function getLastDigit() {
   return num.toString().slice(-1);
@@ -12,13 +12,29 @@ function getLastDigit() {
 console.log(`The last digit of 42 is ${getLastDigit(42)}`);
 console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 console.log(`The last digit of 806 is ${getLastDigit(806)}`);
+*/
 
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+/* The last digit of 42 is 3
+The last digit of 105 is 3
+The last digit of 806 is 3 
+*/
 // Explain why the output is the way it is
 // =============> write your explanation here
+
+// Because the method uses the num value which is 103.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+function getLastDigit(num) {
+  return num.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(806)}`);
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+// The function getLastDigit wasn't using intended parameters

From 39a813f6cb017532191a0131cfa5f64c06407669 Mon Sep 17 00:00:00 2001
From: Diana <40689028+ausiejute@users.noreply.github.com>
Date: Mon, 28 Sep 2026 22:29:45 +0100
Subject: [PATCH 2/8] Complete all Key-Errors exercises

---
 Sprint-3/1-key-errors/0.js | 15 +++++++++++----
 Sprint-3/1-key-errors/1.js | 18 +++++++++++++-----
 Sprint-3/1-key-errors/2.js | 17 ++++++++++-------
 3 files changed, 34 insertions(+), 16 deletions(-)

diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 653d6f5a0..17b65d00b 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -1,13 +1,20 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> If the function will be called, it will print the first letter of the string
+// in capital with the rest of the word in lowercase
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
-function capitalise(str) {
+/* function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
+} */
+
+// =============> A SyntaxError was thrown because the str was used to name both the function parameter
+// and a new variable, which cannot happen in the same scope
+// =============>
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+console.log(capitalise("mother"));
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index f2d56151f..5c6724272 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -1,20 +1,28 @@
 // Predict and explain first...
+// There will be another syntax error, because the same name is used for both the parameter and the variable
+// (decimalNumber)
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============>
+// We cannot redeclare a variable with the same name in the same scope.
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
+/*function convertToPercentage(decimalNumber) {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
-
-console.log(decimalNumber);
-
+*/
 // =============> write your explanation here
+//
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage;
+}
+
+console.log(convertToPercentage(0.8));
diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index aad57f7cf..fed0d1a76 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -1,20 +1,23 @@
-
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// I predict it will say 'num is not defined'
 
-function square(3) {
-    return num * num;
-}
+//  function square(3) {
+//     return num * num;
+// }
 
 // =============> write the error message here
-
+// SyntaxError: Unexpected number
 // =============> explain this error message here
-
+// Instead of a parameter name, the actual value was passed, resulting in an error;
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num) {
+  return num * num;
+}
+console.log(square(6));

From 17a224314ebfd0862d9df80c13d970c3c4d879e5 Mon Sep 17 00:00:00 2001
From: Diana <40689028+ausiejute@users.noreply.github.com>
Date: Mon, 28 Sep 2026 22:43:47 +0100
Subject: [PATCH 3/8] Complete all mandatory-implement exercises

---
 Sprint-3/3-mandatory-implement/1-bmi.js       |  4 ++++
 Sprint-3/3-mandatory-implement/2-cases.js     |  9 +++++++++
 Sprint-3/3-mandatory-implement/3-to-pounds.js | 20 +++++++++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/Sprint-3/3-mandatory-implement/1-bmi.js b/Sprint-3/3-mandatory-implement/1-bmi.js
index 58b1085f1..17f01474c 100644
--- a/Sprint-3/3-mandatory-implement/1-bmi.js
+++ b/Sprint-3/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,9 @@
 // It should return a string of their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
+  let bmi = weight / (height * height);
+  return bmi.toFixed(1);
+
   // return the BMI of someone based off their weight and height
 }
+console.log(`Your Bmi is ${calculateBMI(56, 1.66)}`);
diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index 5b0ef77ad..d1a7b7a2c 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -14,3 +14,12 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+
+function upperCaseMaker(str) {
+  let upperCased = str.toUpperCase();
+  let symbol = "_";
+  let underscored = upperCased.split(" ").join(symbol);
+  return underscored;
+}
+
+console.log(upperCaseMaker("the sun is shining"));
diff --git a/Sprint-3/3-mandatory-implement/3-to-pounds.js b/Sprint-3/3-mandatory-implement/3-to-pounds.js
index 10754da73..05f85fc4c 100644
--- a/Sprint-3/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-3/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,23 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+
+function toPounds(penceString) {
+  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");
+
+  return `£${pounds}.${pence}`;
+}
+
+console.log(toPounds("11000p"));
+// results of some different inputs: 0p -> £0.00, 3p -> £0.03, 50p -> £0.50, 170p -> £1.70, 1200p -> £12.00, 11000p -> £110.00

From d14629e47b728d40effd51fd3a9dad85a4ea4a10 Mon Sep 17 00:00:00 2001
From: Diana <40689028+ausiejute@users.noreply.github.com>
Date: Mon, 28 Sep 2026 22:45:14 +0100
Subject: [PATCH 4/8] Complete mandatory-interpret exercise

---
 Sprint-3/4-mandatory-interpret/time-format.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/Sprint-3/4-mandatory-interpret/time-format.js b/Sprint-3/4-mandatory-interpret/time-format.js
index c0dd9c9a5..edba00a6f 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -21,18 +21,18 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> 3
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
 // b) What is the value assigned to num when pad is called for the first time?
-// =============> write your answer here
+// =============> 0
 
 // c) What is the return value of pad when it is called for the first time?
-// =============> write your answer here
+// =============> "00"
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> 1, because that's the actual value assigned to the num parameter
 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> "01", the remainingSeconds is 1, which gets padded to "01" in the return value

From 57a02870826a5633603e1b41efa1429d50b734aa Mon Sep 17 00:00:00 2001
From: Diana <40689028+ausiejute@users.noreply.github.com>
Date: Tue, 29 Sep 2026 22:59:46 +0100
Subject: [PATCH 5/8] comment out the original code and uncomment the correct
 one

---
 Sprint-3/2-mandatory-debug/0.js | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index 9d8d9c0f0..b675e6293 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -3,12 +3,11 @@
 // =============>
 // Variables haven't been declared, so it will throw a reference error
 
-function multiply(a, b) {
+/* function multiply(a, b) {
   console.log(a * b);
 }
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
-
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`); */
 // =============> write your explanation here
 // It printed 32 because that particular console function is inside the multiply function (local), whereas the other one
 // is outside the scope and when we call the multiply function it comes up as undefined because nothing has been returned
@@ -16,7 +15,7 @@ console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
 
-/* function multiply(a, b) {
+function multiply(a, b) {
   return a * b;
 }
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`); */
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);

From 863cbad2220981451467e82afb060a11300a8300 Mon Sep 17 00:00:00 2001
From: Diana <40689028+ausiejute@users.noreply.github.com>
Date: Tue, 29 Sep 2026 23:04:37 +0100
Subject: [PATCH 6/8] Fix the name of the function

---
 Sprint-3/3-mandatory-implement/2-cases.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index d1a7b7a2c..97afe4bc9 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -15,11 +15,11 @@
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
 
-function upperCaseMaker(str) {
+function upperSnakeCaseMaker(str) {
   let upperCased = str.toUpperCase();
   let symbol = "_";
   let underscored = upperCased.split(" ").join(symbol);
   return underscored;
 }
 
-console.log(upperCaseMaker("the sun is shining"));
+console.log(upperSnakeCaseMaker("the sun is shining"));

From 67f01954499570bc9a34fcb3ed039c95a89ccd14 Mon Sep 17 00:00:00 2001
From: Diana <40689028+ausiejute@users.noreply.github.com>
Date: Tue, 29 Sep 2026 23:14:24 +0100
Subject: [PATCH 7/8] Add actual function calls for the different inputs

---
 Sprint-3/3-mandatory-implement/3-to-pounds.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Sprint-3/3-mandatory-implement/3-to-pounds.js b/Sprint-3/3-mandatory-implement/3-to-pounds.js
index 05f85fc4c..02235535b 100644
--- a/Sprint-3/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-3/3-mandatory-implement/3-to-pounds.js
@@ -22,5 +22,10 @@ function toPounds(penceString) {
   return `£${pounds}.${pence}`;
 }
 
-console.log(toPounds("11000p"));
 // results of some different inputs: 0p -> £0.00, 3p -> £0.03, 50p -> £0.50, 170p -> £1.70, 1200p -> £12.00, 11000p -> £110.00
+console.log(toPounds("0p"));
+console.log(toPounds("3p"));
+console.log(toPounds("50p"));
+console.log(toPounds("170p"));
+console.log(toPounds("1200p"));
+console.log(toPounds("11000p"));

From 5fdc5205a46729f6b80acd2c216756afcf999621 Mon Sep 17 00:00:00 2001
From: Diana <40689028+ausiejute@users.noreply.github.com>
Date: Tue, 29 Sep 2026 23:23:32 +0100
Subject: [PATCH 8/8] Add the reason to answer d)

---
 Sprint-3/4-mandatory-interpret/time-format.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sprint-3/4-mandatory-interpret/time-format.js b/Sprint-3/4-mandatory-interpret/time-format.js
index edba00a6f..158cf6a82 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -32,7 +32,7 @@ function formatTimeDisplay(seconds) {
 // =============> "00"
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> 1, because that's the actual value assigned to the num parameter
+// =============> 1, because that's the actual value assigned to the num parameter (remainingSeconds is 1)
 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
 // =============> "01", the remainingSeconds is 1, which gets padded to "01" in the return value