London | Jan2026 | Ihor Taradaiko | Sprint 2 | Coursework/sprint 2

Sprint-2/1-key-errors/0.js

@@ -1,6 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
-
+//Should return error as str was already declared?
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
@@ -10,4 +10,11 @@ function capitalise(str) {
 }
 
 // =============> write your explanation here
+//The parameter name str is already declared as a variable
 // =============> write your new code here
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+
+console.log(capitalise("string"));

Sprint-2/1-key-errors/1.js

@@ -2,7 +2,7 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-
+//2 errors: 1. The parameter decimalNumber is already declared 2. it should show error or undefined as console.log is calling variable not the function
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
@@ -15,6 +15,13 @@ function convertToPercentage(decimalNumber) {
 console.log(decimalNumber);
 
 // =============> write your explanation here
-
+// Identifier 'decimalNumber' has already been declared - 
 // 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(0.5));

Sprint-2/1-key-errors/2.js

@@ -4,17 +4,20 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
-
-function square(3) {
-    return num * num;
-}
+//we can't declare number as a variable 
+// function square(3) {
+//     return num * num;
+// }
 
 // =============> write the error message here
-
+//Uncaught SyntaxError SyntaxError: Unexpected number
 // =============> explain this error message here
-
+//we can't declare number as a variable ?
 // Finally, correct the code to fix the problem
-
+function square(num) {
+    return num * num;
+}
+console.log(square(2))
 // =============> write your new code here
 
 

Sprint-2/2-mandatory-debug/0.js

@@ -1,14 +1,18 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here - It will print 320 inside the function, but the template string will show "undefined" because multiply does not return a value.
 
 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
+// =============> write your explanation here - multiply() uses console.log to display the result, but it doesn't return anything. In JavaScript, a function with no return statement returns undefined, so ${multiply(10, 32)} becomes undefined even though 320 was logged earlier.
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiplyFixed(a, b) {
+  return a * b;
+}
+console.log(`The result of multiplying 10 and 32 is ${multiplyFixed(10, 32)}`);

Sprint-2/2-mandatory-debug/1.js

@@ -1,6 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
-
+//  =============> write your prediction here - should show undefined as there are ";" after return inside the function
 function sum(a, b) {
   return;
   a + b;
@@ -10,4 +9,9 @@ console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> write your new code here - you can't divide the return parameters with ";"
+function sum(a, b) {
+  return a + b;
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

Sprint-2/2-mandatory-debug/2.js

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here - it should print last digit of 103 
 
 const num = 103;
 
@@ -14,11 +14,22 @@ 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
+// =============> write the output here - we have set num as constant value 103, inside the function we use it as it is constant, ignoring other inputs
+// 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
+// =============> write your explanation here - 
 // 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
+// It wasn't working because it used the outer variable num instead of the input value

Sprint-2/3-mandatory-implement/1-bmi.js

@@ -15,5 +15,8 @@
 // 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
-}
+  const bmi = weight / (height * height);
+  return Number(bmi.toFixed(1));
+}
+
+console.log(calculateBMI(70, 1.73));

Sprint-2/3-mandatory-implement/2-cases.js

@@ -14,3 +14,9 @@
 // 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 upperSnake(string)
+{
+    return string.trim().split(" ").join("_").toUpperCase()
+}
+console.log(upperSnake("hello there"))

Sprint-2/3-mandatory-implement/3-to-pounds.js

@@ -4,3 +4,27 @@
 // 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(str) {
+  // 1. const penceString = "399p": initialises a string variable with the value "399p"
+  const penceStringWithoutTrailingP = str.substring(0, str.length - 1);
+
+  //2. removes "P" from the string
+  const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+  //3. Ensures the string is at least 3 characters long by adding 0 to the start
+  const pounds = paddedPenceNumberString.substring(
+    0,
+    paddedPenceNumberString.length - 2
+  );
+
+  //4. Extracts everything except the last 2 digits of paddedPenceNumberString
+  const pence = paddedPenceNumberString
+    .substring(paddedPenceNumberString.length - 2)
+    .padEnd(2, "0");
+  return pence;
+}
+//5. takes the last 2 digits as the pence from paddedPenceNumberStringCollapse comment
+console.log(toPounds("399p"));
+console.log(toPounds("400p"));
+console.log(toPounds("301p"));
+console.log(toPounds("302p"));

Sprint-2/4-mandatory-interpret/time-format.js

@@ -16,19 +16,19 @@ function formatTimeDisplay(seconds) {
 
 // Questions
 
-// a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// a) When formatTimeDisplay is called how many times will pad be called? 
+// =============> write your answer here - 3 times
 
 // 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
+// b) What is the value assigned to num when pad is called for the first time? - 
+// =============> write your answer here - First call is pad(totalHours)
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> write your answer here - it returs 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
+// =============> write your answer here -  Last call is pad(remainingSeconds) For 61, remainingSeconds = 61 % 60 = 1, so num is 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
+// =============> write your answer here - With num = 1, pad(1) returns "01". "1".padStart(2, "0") adds zero to make it 2 characters long.

Sprint-2/5-stretch-extend/format-time.js

@@ -3,23 +3,30 @@
 // 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 formatAs12HourClock(time) {
-  const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  const hours = Number(time.slice(0, 2)); 
+  const minutes = time.slice(3, 5); 
+  let ampm = "am";
+  let newHours = hours;
+
+  if (hours === 0) {
+    newHours = 12; // midnight
+  } else if (hours === 12) {
+    ampm = "pm"; // noon
+  } else if (hours > 12) {
+    newHours = hours - 12;
+    ampm = "pm";
   }
-  return `${time} am`;
+
+  const showHours = newHours.toString().padStart(2, "0");
+  return `${showHours}:${minutes} ${ampm}`;
 }
 
-const currentOutput = formatAs12HourClock("08:00");
-const targetOutput = "08:00 am";
-console.assert(
-  currentOutput === targetOutput,
-  `current output: ${currentOutput}, target output: ${targetOutput}`
-);
+// Now let's test different times
 
-const currentOutput2 = formatAs12HourClock("23:00");
-const targetOutput2 = "11:00 pm";
-console.assert(
-  currentOutput2 === targetOutput2,
-  `current output: ${currentOutput2}, target output: ${targetOutput2}`
-);
+console.log(formatAs12HourClock("00:00"));
+console.log(formatAs12HourClock("00:01"));
+console.log(formatAs12HourClock("08:00"));
+console.log(formatAs12HourClock("11:59"));
+console.log(formatAs12HourClock("12:00"));
+console.log(formatAs12HourClock("13:45"));
+console.log(formatAs12HourClock("23:14"));