LONDON | MAY2025 | STRUCTURING AND TESTING DATA | SPRING 2 JESUS DEL MORAL

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

@@ -1,13 +1,28 @@
 // Predict and explain first...
 //  =============> write your prediction here
 
+//  declare str again inside the function, which causes a syntax error
+
+
 // 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;
-}
 
 // =============> write your explanation here
+
+// str[0].toUpperCase() → capitalizes the first letter.
+
+// str.slice(1) → returns the rest of the string starting from index 1.
+
+// Combines both parts into a new string.
+
+
 // =============> write your new code here
+
+function capitalise(str) {
+  let capitalised = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalised;
+}
+
+console.log(capitalise("hello")); // "Hello"
+console.log(capitalise("jesus")); // "Jesus"

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

@@ -1,20 +1,24 @@
 // Predict and explain first...
 
+// We are not calling to the function from console.log, the function is convertToPercentage
+// Also, its using decimalNumber outside the function, decimalnumber is a parameter it’s not defined in the global scope.
+
 // Why will an error occur when this program runs?
 // =============> write your prediction here
 
 // Try playing computer with the example to work out what is going on
 
+
+// =============> write your explanation here
+
+// Finally, correct the code to fix the problem
+// =============> write your new code here
+
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
-
   return percentage;
 }
 
-console.log(decimalNumber);
-
-// =============> write your explanation here
+console.log(convertToPercentage(0.5)); // "50%"
+console.log(convertToPercentage(0.25)); // "25%"
 
-// Finally, correct the code to fix the problem
-// =============> write your new code here

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

@@ -5,10 +5,17 @@
 
 // =============> write your prediction of the error here
 
-function square(3) {
+// It will get an error because as parameter to the function is a integer (3) 
+// Also num is not declare in anywhere
+
+function square(num) {
     return num * num;
 }
 
+console.log(square(3));
+
+
+
 // =============> write the error message here
 
 // =============> explain this error message here

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

@@ -1,9 +1,11 @@
 // Predict and explain first...
 
+// The function should return a variable, the current function doesn't return anything, just console.log()
+
 // =============> write your prediction here
 
 function multiply(a, b) {
-  console.log(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

@@ -1,9 +1,11 @@
 // Predict and explain first...
+
+//The function is not returning anything
+
 //  =============> write your prediction here
 
 function sum(a, b) {
-  return;
-  a + b;
+  return(a+b)
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

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

@@ -1,11 +1,15 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
+
+// Will be an error because we are not passing a parameter in the function getLastDigit
+// the value of num is taking always the value 103, it declarate at the beginning of the program 
+
 // =============> Write your prediction here
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
+function getLastDigit(num) {
   return num.toString().slice(-1);
 }
 

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

@@ -16,4 +16,11 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
+    const bmi = 0 
+
+    height = height * height; 
+    return(weight / height).toFixed(1);
+}
+
+
+console.log(calculateBMI(72, 1.80));

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 toUpperSnakeCase(str) {
+    return str
+      .trim()                    // Remove leading/trailing whitespace
+      .toUpperCase()             // Convert to uppercase
+      .replace(/\s+/g, '_');     // Replace spaces with underscores
+  }
+
+  console.log(toUpperSnakeCase('hello world'));
+  console.log(toUpperSnakeCase('lord of the rings'));

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

@@ -4,3 +4,32 @@
 // 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 penceStringWithoutTrailingP = penceString.substring(
+  0,
+  penceString.length - 1
+);
+
+const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+const pounds = paddedPenceNumberString.substring(
+  0,
+  paddedPenceNumberString.length - 2
+);
+
+const pence = paddedPenceNumberString
+  .substring(paddedPenceNumberString.length - 2)
+  .padEnd(2, "0");
+
+console.log(`£${pounds}.${pence}`);
+
+}
+
+console.log(toPounds('400p'));
+
+

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

@@ -11,24 +11,26 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+console.log(formatTimeDisplay(61));
+
 // You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
 // to help you answer these questions
 
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// Pad function is called 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
+// The value is 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// The value 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
+// The value assigned last time we called Pad is 1, but the return is 01
 
 // 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
+// The value is returned is 01