Birmingham | ITP-Jan-26 | Ayodeji Ayorinde | Sprint 2 | Structuring and Testing Data

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> Prediction: The function capitalise is possibly meant to capitalise the first letter in a string.
 
 // 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
+// =============> =============> write your explanation here
+// The 'str' variable on the left hand side is the same used in the function name implementation which should not be.
 // =============> write your new code here
+function capitalise(str) {
+  let capFunction = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capFunction;
+}

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

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> I suspect than an error will occur
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +14,10 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
-
+// =============> write your explanation here.  The functions takes a decimal number as input and converts it to percentage by multiplying by 100
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage;
+}

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

@@ -3,18 +3,22 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> write your prediction of the error here. The error is likely to be caused by square(3), '3' is supposed to be replaced by a string representing the number.
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
-
+// function square(3) {
+//                 ^
+//  SyntaxError: Unexpected number
 // =============> explain this error message here
-
+// The muber '3' should be used when calling the function and it should not be used as a parameter.
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-
+function square(num) {
+    return num * num;
+}
 

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

@@ -1,14 +1,17 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here. It may likely have issues as console.log() is within function implementation, instead of using'return'
 
 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. Instead of having console.log() is within function implementation, it should be replaced with 'return'
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a, b) {
+  return (a * b);
+}

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

@@ -1,5 +1,6 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here. An error will result becasue of the ';' between return and a + b
+
 
 function sum(a, b) {
   return;
@@ -8,6 +9,9 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here. The ideal statement should be 'return a + b; ' but this statement is separated by ';'
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum(a, b) {
+  return a + b;
+}

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

@@ -1,7 +1,10 @@
 // Predict and explain first...
 
+
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here.
+// //ANS: To return the last digit of num as a string.
+
 
 const num = 103;
 
@@ -15,10 +18,35 @@ 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
+// =============> write your explanation here. 
+// //ANS: 
+// num is a constant variable, a hardcoded reference.
+//The function getLastDigit is currently ignoring the arguments you pass to it(42, 105, 806) because of two main issues:
+
+//Missing Parameter: The function definition function getLastDigit() does not have a parameter inside the parentheses.In JavaScript, if you pass an argument to a function that hasn't defined a parameter to receive it, the function simply ignores that input.
+
+//Scope and Variable Reference: Inside the function, you are explicitly calling num.toString().Since num isn't defined inside the function, the engine looks at the Global Scope, finds const num = 103, and uses that value every single time the function runs.
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+const num = 103; // This is now ignored by the function
+
+// We add 'n' as a parameter to "catch" the numbers we pass in
+function getLastDigit(n) {
+  // We call toString() on 'n' instead of the global 'num'
+  return n.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
+//ANS: Done above.
+// ANS:getLastDigit was not working properly because the value for num is fixed at '103'
+

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

@@ -15,5 +15,13 @@
 // 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
-}
+    // BMI = kg / m^2
+    const bmi = weight / (height * height);
+
+    // .toFixed(1) rounds to 1 decimal place and returns a string
+    return bmi.toFixed(1);
+}
+
+// Example usage:
+const myBMI = calculateBMI(70, 1.73);
+console.log(`The calculated BMI is: ${myBMI}`); // Output: "23.4"

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

@@ -14,3 +14,15 @@
 // 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(text) {
+    // 1. replaceAll(' ', '_') swaps every space for an underscore
+    // 2. toUpperCase() converts the letters to all caps
+    return text.replaceAll(' ', '_').toUpperCase();
+}
+
+// Examples:
+console.log(toUpperSnakeCase("hello there"));         // "HELLO_THERE"
+console.log(toUpperSnakeCase("lord of the rings"));  // "LORD_OF_THE_RINGS"
+console.log(toUpperSnakeCase("javascript is fun"));   // "JAVASCRIPT_IS_FUN"

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

@@ -4,3 +4,40 @@
 // 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
+
+/**
+ * Converts a pence string (e.g., "399p") into a formatted pound string (e.g., "£3.99")
+ * @param {string} penceString - The input string ending in 'p'
+ */
+function toPounds(penceString) {
+    // 1. Remove the trailing 'p'
+    const penceStringWithoutTrailingP = penceString.substring(
+        0,
+        penceString.length - 1
+    );
+
+    // 2. Pad with leading zeros to ensure at least 3 characters (e.g., "5p" -> "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 (the last two digits)
+    const pence = paddedPenceNumberString
+        .substring(paddedPenceNumberString.length - 2)
+        .padEnd(2, "0");
+
+    // 5. Return the formatted string
+    return `£${pounds}.${pence}`;
+}
+
+// --- Testing the function with different inputs ---
+
+console.log(toPounds("399p"));  // Expected: £3.99
+console.log(toPounds("50p"));   // Expected: £0.50
+console.log(toPounds("1250p")); // Expected: £12.50
+console.log(toPounds("8p"));    // Expected: £0.08
+console.log(toPounds("1002p")); // Expected: £10.02

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
+// =============> write your answer here.
+// //ANS: 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
+// =============> write your answer here.
+// ANS: the value assigned to num when pad is called for the first time is 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> write your answer here.
+// //ANS: the return value of pad is called for the first time is '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.
+// ANS: the value assigned to num when pad is called for the last time 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.
+// ANS: Sthe return value assigned to num when pad is called for the last time in this program is '01'