West Midlands | 25-ITP-Sept | Ali Naru | Sprint 2 | Coursework/sprint-2

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

@@ -1,5 +1,8 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here 
+
+// I predict that the code will throw an error when trying to call the function capitalise with a string input
+// because the variable 'str' is being declared twice within the same scope, which is not allowed in JavaScript.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -10,4 +13,14 @@ function capitalise(str) {
 }
 
 // =============> write your explanation here
+
+// The code will throw a SyntaxError because the variable 'str' is being declared twice within the same scope.
 // =============> write your new code here
+
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+
+// Example:
+console.log(capitalise("hello")); // Output: "Hello"

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

@@ -1,7 +1,10 @@
 // Predict and explain first...
-
+// I predict that the code will throw an error when trying to call the function convertToPercentage with a decimal input
+// because the variable 'decimalNumber' is being declared twice within the same scope, which is not allowed in JavaScript.
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// The code will throw a SyntaxError because the variable 'decimalNumber' is being declared twice within the same scope.
+
+
 
 // Try playing computer with the example to work out what is going on
 
@@ -16,5 +19,11 @@ console.log(decimalNumber);
 
 // =============> write your explanation here
 
-// Finally, correct the code to fix the problem
+// The code will throw a SyntaxError because the variable 'decimalNumber' is being declared twice within the same scope.
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber) {
+  decimalNumber = 0.5;
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;

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

@@ -1,20 +1,37 @@
 
 // Predict and explain first BEFORE you run any code...
 
+// I predict that the code will throw a ReferenceError because the variable 'num' is not defined within the function scope.
+
 // this function should square any number but instead we're going to get an error
 
+//
+
 // =============> write your prediction of the error here
 
+// I predict that the code will throw a ReferenceError because the variable 'num' is not defined within the function scope.
+
+/
+
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
 
+// ReferenceError: num is not defined
+
 // =============> explain this error message here
 
+// This error message indicates that the variable 'num' is being used before it has been declared or defined.
+// In the function 'square', the parameter is incorrectly defined as a literal value (3) instead of a variable name.
+
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num) {
+    return num * num;
+}
+// Example:
+console.log(square(3)); // Output: 9    

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

@@ -1,6 +1,9 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// I predict that the code will output the result of the multiplication, but the function multiply will not return a value.
+
+// this function should multiply two numbers and return the result
+
 
 function multiply(a, b) {
   console.log(a * b);
@@ -10,5 +13,13 @@ console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
 
+// The function multiply is using console.log to output the result of the multiplication, but it is not returning a value.
+// Therefore, the template literal will not be able to access the result of the multiplication.
+
 // 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

@@ -1,13 +1,25 @@
 // Predict and explain first...
 //  =============> write your prediction here
 
+// I predict that the code will output 'undefined' because the function sum does not return any value.
+
+// this function should sum two numbers and return the result
+
 function sum(a, b) {
-  return;
-  a + b;
+  return a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+
+
+// The function sum correctly returns the sum of the two numbers, so the template literal will output the correct result.
+
 // 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 change needed as the code is already correct

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

@@ -3,6 +3,10 @@
 // Predict the output of the following code:
 // =============> Write your prediction here
 
+// I predict that the code will output 'undefined' for each call to getLastDigit because the function does not use its parameter.
+
+// This program should tell the user the last digit of each number.
+
 const num = 103;
 
 function getLastDigit() {
@@ -15,10 +19,27 @@ 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 output will be:
+// The last digit of 42 is undefined
+// The last digit of 105 is undefined
+// The last digit of 806 is undefined
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+// The output is 'undefined' because the function getLastDigit does not use its parameter.
+// It always returns the last digit of the variable num, which is 103, not the number passed to it.
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
-// This program should tell the user the last digit of each number.
+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

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

@@ -16,4 +16,27 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
+}
+
+// Predict and explain first...
+//  =============> write your prediction here
+// I predict that the code will output 'undefined' because the function calculateBMI 
+// does not return any value yet.
+
+// =============> write your explanation here
+// The function calculateBMI currently has no return statement, so it will return 'undefined'.
+// To fix this, we need to perform the BMI calculation: 
+// BMI = weight / (height * height)
+// Then, we round the result to one decimal place using toFixed(1).
+
+// Finally, correct the code to fix the problem
+//  =============> write your new code here
+
+function calculateBMI(weight, height) {
+  const bmi = weight / (height * height);
+  return bmi.toFixed(1);
+}
+
+// Example:
+console.log(`The BMI of someone who weighs 70kg and is 1.73m tall is ${calculateBMI(70, 1.73)}`);
+// Output: The BMI of someone who weighs 70kg and is 1.73m tall is 23.4

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

@@ -14,3 +14,30 @@
 // 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 the string in UPPER_SNAKE_CASE
+}
+
+// Predict and explain first...
+//  =============> write your prediction here
+// I predict that the code will output 'undefined' because the function toUpperSnakeCase 
+// does not currently return anything.
+
+// =============> write your explanation here
+// The function needs to replace spaces in the string with underscores ("_") 
+// and then convert all the letters to uppercase.
+// We can do this using string methods: 
+// - replaceAll(" ", "_") (or replace(/ /g, "_") for older versions of JS)
+// - toUpperCase() to convert to uppercase.
+
+// Finally, correct the code to fix the problem
+//  =============> write your new code here
+
+function toUpperSnakeCase(str) {
+  return str.replaceAll(" ", "_").toUpperCase();
+}
+
+// Example:
+console.log(toUpperSnakeCase("hello there"));       // Output: HELLO_THERE
+console.log(toUpperSnakeCase("lord of the rings")); // Output: LORD_OF_THE_RINGS

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

@@ -4,3 +4,31 @@
 // 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) {
+  // normalize input to a trimmed string
+  const input = String(penceString).trim();
+
+  // remove trailing 'p' if present
+  const numericPart = input.endsWith('p') ? input.slice(0, -1) : input;
+
+  // ensure at least 3 digits so we can safely split into pounds / last two pence
+  const padded = numericPart.padStart(3, '0');
+
+  // all but the last two digits are pounds
+  const pounds = padded.slice(0, padded.length - 2);
+
+  // last two digits are pence; ensure two chars
+  const pence = padded.slice(-2).padEnd(2, '0');
+
+  return `£${pounds}.${pence}`;
+}
+
+// Test calls
+console.log(toPounds("399p"));   // £3.99
+console.log(toPounds("5p"));     // £0.05
+console.log(toPounds("75p"));    // £0.75
+console.log(toPounds("0p"));     // £0.00
+console.log(toPounds("1234p"));  // £12.34
+console.log(toPounds(" 42p "));  // £0.42  (works with extra whitespace)
+console.log(toPounds("500"));    // £5.00  (works without trailing 'p')

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

@@ -17,18 +17,23 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> 3 times (once 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
+// =============> num = 0
 
 // c) What is the return value of pad 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
+// =============> num = 1
+// (The last call to pad() is for remainingSeconds, which is 1 when seconds = 61)
 
 // 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
+// =============> "01"
+// (pad() converts 1 to "1" and then pads to two digits, returning "01")
+
+// Example output:
+console.log(formatTimeDisplay(61)); // Output: "00:01:01"