From bb20b652f6e4561e9cc731732d71562e855b391e Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Tue, 9 Dec 2025 11:49:35 +0100
Subject: [PATCH 01/11] Added key-errors/0.js file solution.

---
 Sprint-2/1-key-errors/0.js | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a07..1d4b725cd1 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -1,13 +1,31 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// 
+// We'll get syntax error with variable declaration. Function already have 
+// the variable str as a parameter. Then we try to declare another variable with
+// the same name in the function body.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
+// function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   return str;
+// }
+// 
+// capitalise("module structuring and testing data");
 
 // =============> write your explanation here
+//
+// As predicted we cath error 'SyntaxError: Identifier 'str' has already been declared'
+//
 // =============> write your new code here
+
+function capitalise(str) {
+  let resultStr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return resultStr;
+}
+
+console.log(capitalise("module structuring and testing data"));
+
+

From 76fa5f1b273153996ab0521414754de844795c45 Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Tue, 9 Dec 2025 12:08:34 +0100
Subject: [PATCH 02/11] Added key errors 1.js file solution.

---
 Sprint-2/1-key-errors/1.js | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f4..c4cd145349 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -2,19 +2,39 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-
+//
+// We'll get a syntax error with redeclaration of the exist variable. The variable
+// decimalNumber is already declared as a parameter of the function, but then we
+// try to declare and initialize new constant with the same name. Other problem
+// is that we try to use in the console.log() function invocation variable declared
+// inside the function and don't accessible from global scope.
+//
 // Try playing computer with the example to work out what is going on
 
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
+
+//   return percentage;
+// }
+
+// console.log(decimalNumber);
+
+// =============> write your explanation here
+//
+// As predicted we got an error 'SyntaxError: Identifier 'decimalNumber' has 
+// already been declared'. But solution depends of logic of the function.
+//
+// Finally, correct the code to fix the problem
+// =============> write your new code here
+
+const decimalNumber = 0.5;
+
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
 console.log(decimalNumber);
-
-// =============> write your explanation here
-
-// Finally, correct the code to fix the problem
-// =============> write your new code here
+console.log(convertToPercentage(decimalNumber));
\ No newline at end of file

From 86d35f882a369f099a5ca7f6731cef0e3b96d8e0 Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Tue, 9 Dec 2025 12:19:44 +0100
Subject: [PATCH 03/11] Added key errors 2.js file solution.

---
 Sprint-2/1-key-errors/2.js | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cfe..cc3c0fc0b6 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -4,17 +4,31 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+//
+// We have function declaration errors:
+// 1. Instead of a parameter there is an numeric value in the function signature
+// 2. We try to use undeclared variable num in the body of the function.
 
-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
-
+//
+// As predicted error is a numeric literal instead of the function parameter.
+//
 // Finally, correct the code to fix the problem
-
+//
+// We need to change the number 3 with name of variable is used in function
+//
 // =============> write your new code here
 
+function square(num) {
+    return num * num;
+}
 
+console.log(square(3));
\ No newline at end of file

From 78c435f05aa496f40e17bc3dd4f38376a74d8d2c Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Wed, 10 Dec 2025 11:45:03 +0100
Subject: [PATCH 04/11] Added sprint 2 mandatory debug 0.js file solution.

---
 Sprint-2/2-mandatory-debug/0.js | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b417..7749ea7451 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -2,13 +2,28 @@
 
 // =============> write your prediction here
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+// In function multiply first will be evaluated the multiply expression in parentheses.
+// Then the received value will be printed in the console. So as result of running code
+// we'll get result output:
+// 320
+// The result of multiplying 10 and 32 is undefined
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+// function multiply(a, b) {
+//   console.log(a * b);
+// }
+
+// console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
 
+// The multiply(a, b) function doesn't have a return value. So every time we run
+// it we'll get undefined as a return value.
+
 // 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 948aa5bfedabd15113fbadb0ff71c7157a1e440b Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Wed, 10 Dec 2025 11:56:58 +0100
Subject: [PATCH 05/11] Added mandatory debug 1.js file solution.

---
 Sprint-2/2-mandatory-debug/1.js | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcfd..2dd362d048 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,13 +1,27 @@
 // Predict and explain first...
 //  =============> write your prediction here
 
-function sum(a, b) {
-  return;
-  a + b;
-}
+// As the result of function's work we'll get undefined value. So th code running
+// result will look like:
+// 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)}`);
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+
+// It happens because function's return statement stands before summing expression
+// and return as function's work result undefined value.
+
 // 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)}`);
\ No newline at end of file

From 512d5ad48a0f136b76ab925958f4a66d74836e8b Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Wed, 10 Dec 2025 12:14:11 +0100
Subject: [PATCH 06/11] Added sprint 2 mandatory debug 2.js solution

---
 Sprint-2/2-mandatory-debug/2.js | 38 +++++++++++++++++++++++++++------
 1 file changed, 31 insertions(+), 7 deletions(-)

diff --git a/Sprint-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc35..d2627ff6fe 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -3,22 +3,46 @@
 // Predict the output of the following code:
 // =============> Write your prediction here
 
-const num = 103;
+// The output will looks lke:
+// The last digit of 42 is 3
+// The last digit of 105 is 3
+// The last digit of 806 is 3
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// const num = 103;
 
-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)}`);
+// 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)}`);
 
 // 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
+
+// The given function doesn't have arguments and every time operate with variable
+// num that is declared as global and is initialized with value 103.
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+const num = 103;
+
+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

From bab0b6b19d143e167d8e3ab89477ebea8a145162 Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Wed, 10 Dec 2025 22:14:20 +0100
Subject: [PATCH 07/11] Added sprin 2 mandatory implement 1-bmi.js solution.

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

diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1b..c09c614d4a 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,5 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
-    // return the BMI of someone based off their weight and height
+    return (weight / Math.pow(height, 2)).toFixed(1);
 }
\ No newline at end of file

From aec8c900a6dbe151fa53b4d57816af701de86521 Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Wed, 10 Dec 2025 22:22:37 +0100
Subject: [PATCH 08/11] Added sprint 2 mandatory implement 2-cases.js solution.

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

diff --git a/Sprint-2/3-mandatory-implement/2-cases.js b/Sprint-2/3-mandatory-implement/2-cases.js
index 5b0ef77ad9..029a0ba375 100644
--- a/Sprint-2/3-mandatory-implement/2-cases.js
+++ b/Sprint-2/3-mandatory-implement/2-cases.js
@@ -14,3 +14,7 @@
 // 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 toUpperSnakeCase(str) {
+  return str.toUpperCase().replaceAll(' ', '_'); 
+}
\ No newline at end of file

From 6786b402c9600431c90285b01b1a56d9bd9179f8 Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Wed, 10 Dec 2025 22:56:18 +0100
Subject: [PATCH 09/11] Aded sprint 2 mandatory implement 3-to-pounds.js file
 solution.

---
 Sprint-2/3-mandatory-implement/3-to-pounds.js | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a703..f2cc32b1ea 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,86 @@
 // 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 paddedPenceNumberString = penceString.substring(0, penceString.length - 1).padStart(3, '0');
+  
+  return `£${paddedPenceNumberString.substring(0, paddedPenceNumberString.length -2)}.${
+    paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, '0')}`;
+}
+
+let currentOutput = toPounds("0p");
+let targetOutput = '£0.00';
+console.assert(currentOutput === targetOutput, 
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+)
+
+currentOutput = toPounds("3p");
+targetOutput = "£0.03";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("20p");
+targetOutput = "£0.20";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("99p");
+targetOutput = "£0.99";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("100p");
+targetOutput = "£1.00";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("101p");
+targetOutput = "£1.01";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("120p");
+targetOutput = "£1.20";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("543p");
+targetOutput = "£5.43";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("999p");
+targetOutput = "£9.99";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("1000p");
+targetOutput = "£10.00";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
+
+currentOutput = toPounds("1001p");
+targetOutput = "£10.01";
+console.assert(
+  currentOutput === targetOutput,
+  `Current output: '${currentOutput}', target output '${targetOutput}'`
+);
\ No newline at end of file

From 6ade52f332ad459eaabca0013247bbbdac522191 Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Sat, 13 Dec 2025 17:36:41 +0100
Subject: [PATCH 10/11] Addes answers in mandatory interpres time-format.js
 file.

---
 Sprint-2/4-mandatory-interpret/time-format.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 7c98eb0e8c..f531a1620e 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -19,16 +19,32 @@ function formatTimeDisplay(seconds) {
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
 
+// The function pad(num) will be called 3 times in line 11.
+
+
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
+formatTimeDisplay(61);
+
 // b) What is the value assigned to num when pad is called for the first time?
 // =============> write your answer here
 
+// num = 1;
+
+
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
 
+// return value = '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
 
+// num = 1
+
+
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+
+// return value == '01'
\ No newline at end of file

From 32b835a4e2582576baaf1d870a8bc8539db2855e Mon Sep 17 00:00:00 2001
From: Nikolai Romanov <kolya.rm@gmail.com>
Date: Sat, 13 Dec 2025 18:08:46 +0100
Subject: [PATCH 11/11] Added tests and updated formatAs12HourClock(time)
 function logic in sprint 2 stretch-extended format-time.js file.

---
 Sprint-2/5-stretch-extend/format-time.js | 55 +++++++++++++++++++++++-
 1 file changed, 54 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b8..6ca04c0dfa 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -1,11 +1,15 @@
 // This is the latest solution to the problem from the prep.
 // Make sure to do the prep before you do the coursework
 // Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
+function padTime(num) {
+  return num.toString().padStart(2, '0');
+}
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const minutes = Number(time.slice(3));
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${padTime(hours - 12)}:${padTime(minutes)} pm`;
   }
   return `${time} am`;
 }
@@ -23,3 +27,52 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+const currentOutput3 = formatAs12HourClock("16:00");
+const targetOutput3 = "04:00 pm";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`
+);
+
+const currentOutput4 = formatAs12HourClock("16:08");
+const targetOutput4 = "04:08 pm";
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput4}, target output: ${targetOutput4}`
+);
+
+const currentOutput5 = formatAs12HourClock("16:30");
+const targetOutput5 = "04:30 pm";
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput5}, target output: ${targetOutput5}`
+);
+
+const currentOutput6 = formatAs12HourClock("08:08");
+const targetOutput6 = "08:08 am";
+console.assert(
+  currentOutput6 === targetOutput6,
+  `current output: ${currentOutput6}, target output: ${targetOutput6}`
+);
+
+const currentOutput7 = formatAs12HourClock("08:38");
+const targetOutput7 = "08:38 am";
+console.assert(
+  currentOutput7 === targetOutput7,
+  `current output: ${currentOutput7}, target output: ${targetOutput7}`
+);
+
+const currentOutput8 = formatAs12HourClock("00:00");
+const targetOutput8 = "00:00 am";
+console.assert(
+  currentOutput8 === targetOutput8,
+  `current output: ${currentOutput8}, target output: ${targetOutput8}`
+);
+
+const currentOutput9 = formatAs12HourClock("23:59");
+const targetOutput9 = "11:59 pm";
+console.assert(
+  currentOutput9 === targetOutput9,
+  `current output: ${currentOutput9}, target output: ${targetOutput9}`
+);
\ No newline at end of file