West Midlands | 25-May-ITP | Toluwalase Tiamiyu | Sprint 2 | Coursework

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> An error is likely to occur due to repeat of "str"
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +9,10 @@ function capitalise(str) {
   return str;
 }
 
-// =============> write your explanation here
+// =============> SyntaxError: Identifier 'str' has already been declared. This error occurs because the variable 'str' is being declared again within the function,
+// which is not allowed. To fix this, we can simply remove the 'let' declaration.
 // =============> write your new code here
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
+}
+console.log(capitalise("brother"));

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

@@ -3,18 +3,31 @@
 // Why will an error occur when this program runs?
 // =============> write your prediction here
 
+//Prediction: The program will fail with a SyntaxError because 'decimalNumber' is redeclared.
+
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
+  //const decimalNumber = 0.5; <--- this line causes the syntaxError.
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+//console.log(decimalNumber); <--- this line causes the ReferenceError.
 
 // =============> write your explanation here
+//1. Inside the function: Just like the previous example, the parameter `decimalNumber` acts as a local variable. Trying to redeclare it with `const decimalNumber = 0.5;` causes a crash.
+// Additionally, hardcoding 0.5 defeats the purpose of having a parameter at all.
+
+// 2. Outside the function: The variable `decimalNumber` is "scoped" to the function. It doesn't exist in the outside world. When `console.log(decimalNumber)` runs globally, JavaScript doesn't know what it is,
+// causing a ReferenceError. You need to call the function and pass the number as an argument instead.
 
 // 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 +4,22 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
-
+// Prediction: The code would likely return a syntax error because the parameter in the () is '3' and not 'num'.
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
 
+// A defined function in a () must be variable names, not values.
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num) {
+    return num * num;       
+}
+console.log(square(3));

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

@@ -1,6 +1,7 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// 320
 
 function multiply(a, b) {
   console.log(a * b);
@@ -10,5 +11,14 @@ console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
 
+/*Explanation: The `multiply` function calculates `a * b` and immediately prints it to 
+  the console, but it doesn't use the `return` keyword to hand the value back.
+
 // 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)}`);

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

@@ -1,6 +1,8 @@
 // Predict and explain first...
 //  =============> write your prediction here
 
+//The sum would return as undefined.
+
 function sum(a, b) {
   return;
   a + b;
@@ -9,5 +11,15 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+
+// Explanation: The return keyword is used and the functions is not executed because the expression is on a different line
+//which means the computer would not run the expression alongside the return keyword.
+
 // 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)}`);

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

@@ -2,6 +2,7 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+//I predict the code will output the number '3' for every function call.
 
 const num = 103;
 
@@ -15,10 +16,30 @@ 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
+
+//OUTPUT: '3' was the output for every function call, which is not what I predicted.
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+
+// The output is the way it is because the first line of the code a const statement was declared with the value of 103,
+// and the function getLastDigit() is using that constant instead of the argument passed.
+
 // 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
+
+// This function did not work because javascript looks for the variable inside it and as it was not declared in the function '()' it went looking for num in the global code
+// and locked onto the declared constant value of num = 103 instead of running the passed arguments individually.
+// the code as been corrected by removing the const num = 103 and added num as a parameter to the function getLastDigit(num) so it can now take the arguments individually and return the right output.

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

@@ -15,5 +15,11 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
+    const bmi = weight / (height * height);
+    return Math.round(bmi * 10) / 10;
+}
+
+console.log(calculateBMI(90, 1.85)); // should return 26.3
+
     // return the BMI of someone based off their weight and height
 }

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

@@ -14,3 +14,13 @@
 // 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 NAME: upperSnakeCase
+
+function upperSnakeCase(string) {
+    const upperCaseString = string.toUpperCase();
+    return upperCaseString.replace(' ', '_');
+}
+
+console.log(upperSnakeCase("ultimate team")); // should return "ULTIMATE_TEAM"
+console.log(upperSnakeCase(("grand theft auto VI")); // should return "GRAND_THEFT_AUTO_VI"

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

@@ -4,3 +4,36 @@
 // 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) {
+  // 1. Remove the trailing 'p'
+  const penceStringWithoutTrailingP = penceString.substring(
+    0,
+    penceString.length - 1
+  );
+
+  // 2. Pad with zeros to ensure we always have at least 3 digits (e.g., "5" becomes "005")
+  const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+
+  // 3. Extract the pounds (everything except the last two digits)
+  const pounds = paddedPenceNumberString.substring(
+    0,
+    paddedPenceNumberString.length - 2
+  );
+
+  // 4. Extract the pence (just the last two digits)
+  const pence = paddedPenceNumberString
+    .substring(paddedPenceNumberString.length - 2)
+    .padEnd(2, "0");
+
+  // 5. Return the formatted currency string
+  return `£${pounds}.${pence}`;
+}
+
+// --- Test Cases ---
+// Calling the function multiple times to check it works for different inputs
+console.log(toPounds("399p")); // Expected output: "£3.99"
+console.log(toPounds("5p")); // Expected output: "£0.05"
+console.log(toPounds("2500p")); // Expected output: "£25.00"
+console.log(toPounds("99p")); // Expected output: "£0.99"
+console.log(toPounds("10000p")); // Expected output: "£100.00"

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

@@ -21,18 +21,21 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> It would be called 3 times, that is for hours, minutes and seconds.
 
 // 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
+// =============> The answer would be '0' because the first time pad is called, relates to the hours remaining.
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> It would return '00' because the value of num 0 is converted to a string "0", since its length is less than two the pad function adds a "0" to the front to output "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
+// =============> The answer is 1.
+//explanation: the last time pad is  called is for the remaining seconds, which would return 1 because we passed 61 into the program, calculated as 61 % 60.
 
 // 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
+// =============> Answer "01".
+// Explanation: The return value of pad when it is called for the last time in this program is '01'. This is because the value of num is 1 (the remaining seconds after calculating 61 % 60).
+// Since the length of the string representation of 1 is less than 2, the pad function adds a "0" to the front, resulting in "01".

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

@@ -4,10 +4,24 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  const minutes = time.slice(3, 5);
+  if (hours >= 12) {
+    const pmHours = String(hours === 12 ? 12 : hours - 12).padStart(2, "0");
+    return `${pmHours}:${minutes} pm`;
+  }
+  const amHours = String(hours === 0 ? 12 : hours).padStart(2, "0");
+  return `${amHours}:${minutes} am`;
+}
+
+function runTest(description, input, expected) {
+  const result = formatAs12HourClock(input);
+  console.assert(
+    result === expected,
+    `Test failed for ${description}: expected ${expected}, got ${result}`
+  );
+  if (result === expected) {
+    console.log(`Test passed for ${description}`);
   }
-  return `${time} am`;
 }
 
 const currentOutput = formatAs12HourClock("08:00");
@@ -23,3 +37,17 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+//== Additional Test Cases =//
+
+// Test case for standard AM time
+runTest("Standard early morning", "08:00", "08:00 am");
+runTest("standard late morning", "11:30", "11:30 am");
+
+// Test case for standard PM time
+runTest("Standard afternoon", "13:15", "01:15 pm");
+runTest("Standard evening", "20:45", "08:45 pm");
+
+// Test case for 12-hour threshold2
+runTest("Exact Noon (12:00)", "12:00", "12:00 pm");
+runTest("Exact Midnight", "00:00", "12:00 am");