From 76ef1226eec9deac54911a856fd8eb34c92cfa1a Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 10:51:06 +0100
Subject: [PATCH 01/16] answered 1-key-errors 0.js

---
 Sprint-3/1-key-errors/0.js               | 19 ++++++++++++++++---
 Sprint-3/prep/passwordCheckerFunction.js |  9 +++++++++
 2 files changed, 25 insertions(+), 3 deletions(-)
 create mode 100644 Sprint-3/prep/passwordCheckerFunction.js

diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 653d6f5a0..53026bdf2 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -1,13 +1,26 @@
 // Predict and explain first...
 //  =============> write your prediction here
+//A: when user input the string. First index will be capitalised.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
+//A: SyntaxError: Identifier 'str' has already been declared
 
+//function capitalise(str) {
+//  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//  return str;
+//}
+
+
+// =============> write your explanation here
+//"str" has been declared in function. In the local scope of original code, str declared again.
+//It caused the problem of redeclaration. Delete the "let" in local scope
+// =============> write your new code here
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+console.log(capitalise('roger'))
+
+
diff --git a/Sprint-3/prep/passwordCheckerFunction.js b/Sprint-3/prep/passwordCheckerFunction.js
new file mode 100644
index 000000000..b9049a826
--- /dev/null
+++ b/Sprint-3/prep/passwordCheckerFunction.js
@@ -0,0 +1,9 @@
+const password = "secretword123";
+
+function checkPassword(userInput){
+
+  const response = userInput === password;
+
+  return response;
+
+  console.log(checkPassword(secretword123))
\ No newline at end of file

From dcc7246e3c3b908417022d6bf2b407e6cf1b5c6f Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 11:06:51 +0100
Subject: [PATCH 02/16] answered 1-key-errors 1.js

---
 Sprint-3/1-key-errors/0.js               |  5 +----
 Sprint-3/1-key-errors/1.js               | 24 ++++++++++++++++++------
 Sprint-3/prep/passwordCheckerFunction.js |  9 ---------
 3 files changed, 19 insertions(+), 19 deletions(-)
 delete mode 100644 Sprint-3/prep/passwordCheckerFunction.js

diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 53026bdf2..7698c3002 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -11,7 +11,6 @@
 //  return str;
 //}
 
-
 // =============> write your explanation here
 //"str" has been declared in function. In the local scope of original code, str declared again.
 //It caused the problem of redeclaration. Delete the "let" in local scope
@@ -21,6 +20,4 @@ function capitalise(str) {
   return str;
 }
 
-console.log(capitalise('roger'))
-
-
+console.log(capitalise("roger"));
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index f2d56151f..e3a5791cd 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -2,19 +2,31 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+// A: There have the problem of redeclaration of the statement of decimalNumber. Local Scope should return to decimalNumber instead.
+// To print the code, the code should be console.log(decimalNumber)
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+//function convertToPercentage(decimalNumber) {
+//  const decimalNumber = 0.5;
+//  const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+//  return percentage;
 
-console.log(decimalNumber);
+//console.log(decimalNumber);
 
 // =============> write your explanation here
+//A: In the local scope, remove "const decimalNumber = 0.5". for the second line of local scope, 'const percentage' should be change to
+//'decimalNumber' to avoid redeclaration and refer the correct variable. and return the function to 'decimalNumber'
+//finally console.log(convertToPercentage(0.5)) should be used to print the function.
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber) {
+  decimalNumber = `${decimalNumber * 100}%`;
+
+  return decimalNumber;
+}
+
+console.log(convertToPercentage(0.5));
diff --git a/Sprint-3/prep/passwordCheckerFunction.js b/Sprint-3/prep/passwordCheckerFunction.js
deleted file mode 100644
index b9049a826..000000000
--- a/Sprint-3/prep/passwordCheckerFunction.js
+++ /dev/null
@@ -1,9 +0,0 @@
-const password = "secretword123";
-
-function checkPassword(userInput){
-
-  const response = userInput === password;
-
-  return response;
-
-  console.log(checkPassword(secretword123))
\ No newline at end of file

From 67431afec60686dbb111073369e4fc486e8b473e Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 11:21:37 +0100
Subject: [PATCH 03/16] answered 1-key-errors 2.js

---
 Sprint-3/1-key-errors/2.js | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index aad57f7cf..ff2f79c3e 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -4,17 +4,23 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// The code in local scope could not refer to variable. function square should attach with a variable instead of value.
 
-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
+// the error caused by the wrong input for the variable "square(3)".
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+function square(num) {
+    return num * num;
+}
 
-
+console.log(square(3))

From 227b3eb56529ca794cbe4b3517def19455e9e636 Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 11:43:41 +0100
Subject: [PATCH 04/16] answered 2-mandatory-debugs 0.js

---
 Sprint-3/1-key-errors/2.js      |  5 ++---
 Sprint-3/2-mandatory-debug/0.js | 17 +++++++++++++----
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index ff2f79c3e..f9f5184c8 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -1,4 +1,3 @@
-
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
@@ -20,7 +19,7 @@
 
 // =============> write your new code here
 function square(num) {
-    return num * num;
+  return num * num;
 }
 
-console.log(square(3))
+console.log(square(3));
diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index b27511b41..302921c3b 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -1,14 +1,23 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// local scope code did not return to global.
 
-function multiply(a, b) {
-  console.log(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
+// The calculation of the a * b should apply the the statement (`The result of multiplying 10 and 32 is ${multiply(10, 32)}`).
+// because code on local scope did not return to global. The global cannot apply the result of local.
 
 // 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)}`);

From 07528ad0381fffab5bdae95f0e12482fcfbfecd1 Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 18:17:50 +0100
Subject: [PATCH 05/16] answered 2-mandatory-debugs 1.js

---
 Sprint-3/2-mandatory-debug/1.js | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/Sprint-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 37cedfbcf..5fe106961 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,13 +1,20 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// The result of the function supposed to print 'The sum of 10 and 32 is 42' local scope should be return to sum.
 
-function sum(a, b) {
-  return;
-  a + b;
-}
+//function sum(a, b) {
+//  return;
+//  a + b;
+//}
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// the answer is undefined because of local scope code did not return to global (sum). semicolon of return need to be removed.
 // 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)}`);

From 7acf1561ae3e3bda441042404e9dab0e7c07323f Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 18:47:34 +0100
Subject: [PATCH 06/16] answered 2-mandatory-debugs. 2.js

---
 Sprint-3/2-mandatory-debug/0.js |  4 ++--
 Sprint-3/2-mandatory-debug/1.js |  4 ++--
 Sprint-3/2-mandatory-debug/2.js | 35 ++++++++++++++++++++++++++-------
 3 files changed, 32 insertions(+), 11 deletions(-)

diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index 302921c3b..b7b0be222 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // =============> write your prediction here
-// local scope code did not return to global.
+// A: The result of multiplying 10 and 32 is 320. But local scope code did not return to global.
 
 //function multiply(a, b) {
 //  console.log(a * b);
@@ -10,7 +10,7 @@
 //console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
-// The calculation of the a * b should apply the the statement (`The result of multiplying 10 and 32 is ${multiply(10, 32)}`).
+// A: The calculation of the a * b should apply the the statement (`The result of multiplying 10 and 32 is ${multiply(10, 32)}`).
 // because code on local scope did not return to global. The global cannot apply the result of local.
 
 // Finally, correct the code to fix the problem
diff --git a/Sprint-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 5fe106961..31232f83f 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,6 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
-// The result of the function supposed to print 'The sum of 10 and 32 is 42' local scope should be return to sum.
+// A: The result of the function supposed to print 'The sum of 10 and 32 is 42' local scope should be return to sum.
 
 //function sum(a, b) {
 //  return;
@@ -10,7 +10,7 @@
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
-// the answer is undefined because of local scope code did not return to global (sum). semicolon of return need to be removed.
+// A: the answer is undefined because of local scope code did not return to global (sum). semicolon of return need to be removed.
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
 function sum(a, b) {
diff --git a/Sprint-3/2-mandatory-debug/2.js b/Sprint-3/2-mandatory-debug/2.js
index 57d3f5dc3..3750769f2 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -2,23 +2,44 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// A: The function supposed to print the last digit of 42, 105 and 806 which is 2, 5, 6. But the function could not run smooth
+// because of the variable "num" has been declared.
 
-const num = 103;
+//const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+//function getLastDigit() {
+//  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)}`);
+//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
 
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+//A: 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
+// A: because num has been declared for 103 so the function could only get the last digit of 42, 105 and 806.
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+function getLastDigit(number) {
+  return number.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
+// A: it is because num has been strictly declared as 103 before. and the value is console log could be be applied to function.
+// To fix this parameter of getLastDigit should assign for val as a placeholder to allow different value

From d3c70608866afd61db8c049ce3453c9211d6c2c9 Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 22:23:26 +0100
Subject: [PATCH 07/16] answered 3-mandatory-implement 1-bmi.js

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

diff --git a/Sprint-3/3-mandatory-implement/1-bmi.js b/Sprint-3/3-mandatory-implement/1-bmi.js
index 58b1085f1..480aeb70c 100644
--- a/Sprint-3/3-mandatory-implement/1-bmi.js
+++ b/Sprint-3/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,10 @@
 // It should return a string of their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
-  // return the BMI of someone based off their weight and height
+  const rawBMI = weight / (height * height);
+  const result = Math.floor(rawBMI * 10) / 10;
+
+  return result;
 }
+
+console.log(calculateBMI(77, 1.83));

From fe41ec6b36a44c35a8c417b446bded89d23d4cf5 Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 22:34:14 +0100
Subject: [PATCH 08/16] answered 3-mandatory-implement 2-cases.js

---
 Sprint-3/3-mandatory-implement/2-cases.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index 5b0ef77ad..7004f2401 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -14,3 +14,10 @@
 // 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 upperSnakeCase(val) {
+  const upperCase = val.toUpperCase();
+  return upperCase.replace(" ", "_");
+}
+
+console.log(upperSnakeCase("hello there"));

From bf058eea024c32dc40daa9d85a8d909a3e175b5b Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Wed, 23 Sep 2026 22:51:39 +0100
Subject: [PATCH 09/16] answered 3-mandatory-implement 3-to-pounds.js

---
 Sprint-3/3-mandatory-implement/3-to-pounds.js | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Sprint-3/3-mandatory-implement/3-to-pounds.js b/Sprint-3/3-mandatory-implement/3-to-pounds.js
index 10754da73..ed39a3a56 100644
--- a/Sprint-3/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-3/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,28 @@
 // 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("599p"));
+console.log(toPounds("1234p"));
+console.log(toPounds("49005p"));
+console.log(toPounds("789p"));
+console.log(toPounds("85p"));

From 01e01e9ff657f16f437c26b653807e0f3f55275b Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Fri, 25 Sep 2026 09:51:26 +0100
Subject: [PATCH 10/16] answered 4-mandatory-interpret

---
 Sprint-3/4-mandatory-interpret/time-format.js | 12 +++++++-----
 1 file changed, 7 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..93383d016 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -15,24 +15,26 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+console.log(formatTimeDisplay(61));
+
 // You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
 // to help you answer these questions
 
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> 4
 
 // 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
+// =============> 1
 
 // c) What is the return value of pad when it is called for the first time?
-// =============> write your answer here
+// =============> "01"
 
 // 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
+// =============> 0. The last calling of pad is pad(totalHours). the calculation is 1 (totalMinutues) - 1 (remainingMinutes. The result is 0.)
 
 // 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
+// =============> 1. pad(remainingSeconds is the last calling foe pad.

From 9424a96cb70c8e0586681adc84f827e079cdd905 Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Fri, 25 Sep 2026 09:59:56 +0100
Subject: [PATCH 11/16] tidy up the format.

---
 Sprint-3/1-key-errors/0.js      | 5 ++---
 Sprint-3/1-key-errors/1.js      | 4 ++--
 Sprint-3/1-key-errors/2.js      | 4 ++--
 Sprint-3/2-mandatory-debug/0.js | 2 +-
 Sprint-3/2-mandatory-debug/1.js | 4 ++--
 Sprint-3/2-mandatory-debug/2.js | 6 +++---
 6 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 7698c3002..5c67fecee 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -1,10 +1,9 @@
 // Predict and explain first...
 //  =============> write your prediction here
-//A: when user input the string. First index will be capitalised.
+// when user input the string. First index will be capitalised.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
-//A: SyntaxError: Identifier 'str' has already been declared
 
 //function capitalise(str) {
 //  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
@@ -12,7 +11,7 @@
 //}
 
 // =============> write your explanation here
-//"str" has been declared in function. In the local scope of original code, str declared again.
+// SyntaxError: Identifier 'str' has already been declared. "str" has been declared in function. In the local scope of original code, str declared again.
 //It caused the problem of redeclaration. Delete the "let" in local scope
 // =============> write your new code here
 function capitalise(str) {
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index e3a5791cd..64cc0dbae 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -2,7 +2,7 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-// A: There have the problem of redeclaration of the statement of decimalNumber. Local Scope should return to decimalNumber instead.
+// There have the problem of redeclaration of the statement of decimalNumber. Local Scope should return to decimalNumber instead.
 // To print the code, the code should be console.log(decimalNumber)
 
 // Try playing computer with the example to work out what is going on
@@ -16,7 +16,7 @@
 //console.log(decimalNumber);
 
 // =============> write your explanation here
-//A: In the local scope, remove "const decimalNumber = 0.5". for the second line of local scope, 'const percentage' should be change to
+// In the local scope, remove "const decimalNumber = 0.5". for the second line of local scope, 'const percentage' should be change to
 //'decimalNumber' to avoid redeclaration and refer the correct variable. and return the function to 'decimalNumber'
 //finally console.log(convertToPercentage(0.5)) should be used to print the function.
 
diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index f9f5184c8..290e0656c 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -10,10 +10,10 @@
 //}
 
 // =============> write the error message here
-//SyntaxError: Unexpected number
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
-// the error caused by the wrong input for the variable "square(3)".
+// =============> the error caused by the wrong input for the variable "square(3)".
 
 // Finally, correct the code to fix the problem
 
diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index b7b0be222..80fe37046 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -10,7 +10,7 @@
 //console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
-// A: The calculation of the a * b should apply the the statement (`The result of multiplying 10 and 32 is ${multiply(10, 32)}`).
+// The calculation of the a * b should apply the the statement (`The result of multiplying 10 and 32 is ${multiply(10, 32)}`).
 // because code on local scope did not return to global. The global cannot apply the result of local.
 
 // Finally, correct the code to fix the problem
diff --git a/Sprint-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 31232f83f..5fe106961 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,6 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
-// A: The result of the function supposed to print 'The sum of 10 and 32 is 42' local scope should be return to sum.
+// The result of the function supposed to print 'The sum of 10 and 32 is 42' local scope should be return to sum.
 
 //function sum(a, b) {
 //  return;
@@ -10,7 +10,7 @@
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
-// A: the answer is undefined because of local scope code did not return to global (sum). semicolon of return need to be removed.
+// the answer is undefined because of local scope code did not return to global (sum). semicolon of return need to be removed.
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
 function sum(a, b) {
diff --git a/Sprint-3/2-mandatory-debug/2.js b/Sprint-3/2-mandatory-debug/2.js
index 3750769f2..c2e9d1493 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -2,7 +2,7 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
-// A: The function supposed to print the last digit of 42, 105 and 806 which is 2, 5, 6. But the function could not run smooth
+// The function supposed to print the last digit of 42, 105 and 806 which is 2, 5, 6. But the function could not run smooth
 // because of the variable "num" has been declared.
 
 //const num = 103;
@@ -20,13 +20,13 @@
 
 // Now run the code and compare the output to your prediction
 // =============> write the output here
-//A: The last digit of 42 is 3
+//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
-// A: because num has been declared for 103 so the function could only get the last digit of 42, 105 and 806.
+// because num has been declared for 103 so the function could only get the last digit of 42, 105 and 806.
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here

From 233b1a06198410059c53f432be19e5bb03e9a508 Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Mon, 28 Sep 2026 22:38:25 +0100
Subject: [PATCH 12/16] modified answer of 4-mandatory-interpret time-format.js

---
 Sprint-3/4-mandatory-interpret/time-format.js | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/Sprint-3/4-mandatory-interpret/time-format.js b/Sprint-3/4-mandatory-interpret/time-format.js
index 93383d016..6f8550e7b 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -23,18 +23,19 @@ console.log(formatTimeDisplay(61));
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> 4
+// =============> 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?
-// =============> 1
+// =============> 0
 
 // c) What is the return value of pad when it is called for the first time?
-// =============> "01"
+// =============> "00"
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> 0. The last calling of pad is pad(totalHours). the calculation is 1 (totalMinutues) - 1 (remainingMinutes. The result is 0.)
+// =============> 1. The last calling of pad is pad(remainingSeconds).
 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
-// =============> 1. pad(remainingSeconds is the last calling foe pad.
+// =============> "01". after pad(remainingSeconds) which is the last value returned.
+// 1 convert to "01" in function pad(num.)

From 6def982db05003db3eca1c299cc79406d7d29009 Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Mon, 28 Sep 2026 22:59:40 +0100
Subject: [PATCH 13/16] modified answer of 3-mandatory-implement 1-bmi.js

---
 Sprint-3/3-mandatory-implement/1-bmi.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/Sprint-3/3-mandatory-implement/1-bmi.js b/Sprint-3/3-mandatory-implement/1-bmi.js
index 480aeb70c..ac5f071b3 100644
--- a/Sprint-3/3-mandatory-implement/1-bmi.js
+++ b/Sprint-3/3-mandatory-implement/1-bmi.js
@@ -16,9 +16,7 @@
 
 function calculateBMI(weight, height) {
   const rawBMI = weight / (height * height);
-  const result = Math.floor(rawBMI * 10) / 10;
-
-  return result;
+  return rawBMI.toFixed(1);
 }
 
 console.log(calculateBMI(77, 1.83));

From c12947f810b86b7652ec24a5102ba4d7ba9f7931 Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Mon, 28 Sep 2026 23:03:59 +0100
Subject: [PATCH 14/16] modified answer of 3-mandatory-implement 2-cases.js

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

diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index 7004f2401..3031772b7 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -17,7 +17,8 @@
 
 function upperSnakeCase(val) {
   const upperCase = val.toUpperCase();
-  return upperCase.replace(" ", "_");
+  return upperCase.replaceAll(" ", "_");
 }
 
 console.log(upperSnakeCase("hello there"));
+console.log(upperSnakeCase("lord of the rings"));

From b5d2d7bf0dcacbd993d29176f0b43216bc757dfd Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Mon, 28 Sep 2026 23:06:02 +0100
Subject: [PATCH 15/16] modified answer of 2-mandatory-debugs 1.js

---
 Sprint-3/2-mandatory-debug/1.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sprint-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 5fe106961..0b584b5aa 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -7,7 +7,7 @@
 //  a + b;
 //}
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+//console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
 // the answer is undefined because of local scope code did not return to global (sum). semicolon of return need to be removed.

From 20296bb1b8e87bd7169c8d81a65f8fe6b94e662d Mon Sep 17 00:00:00 2001
From: Roger Lee <lee.roger.fn@gmail.com>
Date: Mon, 28 Sep 2026 23:14:57 +0100
Subject: [PATCH 16/16] modified the answer of 2-mandatory-debug 2.js

---
 Sprint-3/2-mandatory-debug/2.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Sprint-3/2-mandatory-debug/2.js b/Sprint-3/2-mandatory-debug/2.js
index c2e9d1493..234392f74 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -26,8 +26,7 @@
 
 // Explain why the output is the way it is
 // =============> write your explanation here
-// because num has been declared for 103 so the function could only get the last digit of 42, 105 and 806.
-
+// because num has been declared for 103 so the function could only return 3 even though use requested to return last digit of 42, 105, 806.
 // Finally, correct the code to fix the problem
 // =============> write your new code here