Barcelona | class-oct2025-2t | Dinia Carmona Brenes | Sprint1| CourseWork

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

@@ -1,2 +1,2 @@
-This is just an instruction for the first activity - but it is just for human consumption
-We don't want the computer to run these 2 lines - how can we solve this problem?
+//This is just an instruction for the first activity - but it is just for human consumption
+//We don't want the computer to run these 2 lines - how can we solve this problem?

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

@@ -1,4 +1,5 @@
 // trying to create an age variable and then reassign the value by 1
+// I changed for let
 
-const age = 33;
+let age = 33;
 age = age + 1;

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

@@ -1,5 +1,7 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
+// I have ti change the order
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+

Sprint-1/2-mandatory-errors/3.js

@@ -1,4 +1,4 @@
-const cardNumber = 4533787178994213;
+/*const cardNumber = 4533787178994213;
 const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
@@ -7,3 +7,9 @@ const last4Digits = cardNumber.slice(-4);
 // Then run the code and see what error it gives.
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+/*Answer> The code will not works because slice is strigs and array and
+cardNumber is number */
+const cardNumber = 4533787178994213;
+const last4Digits = cardNumber.slice(-4);
+
+

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,7 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+/*const 12HourClockTime = "20:53";
+const 24hourClockTime = "08:53";
+*/
+
+//Answer:
+const Hour12ClockTime = "20:53";
+const hour24ClockTime = "08:53";

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -1,4 +1,4 @@
-let carPrice = "10,000";
+/*let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
@@ -12,11 +12,29 @@ console.log(`The percentage change is ${percentageChange}`);
 // Read the code and then answer the questions below
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
+/* carPrice.replaceAll(",", "")  línea 4
+Number(carPrice.replaceAll(",", ""))  línea 4
+priceAfterOneYear.replaceAll("," "")  línea 5
+Number(priceAfterOneYear.replaceAll("," ""))  línea 5
+console.log(...)  línea 9
+Total> 5 calls
 
 // b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
 
+is missing coma
+console.log(...)  in line 9
+
 // c) Identify all the lines that are variable reassignment statements
+carPrice = Number(carPrice.replaceAll(",", "")); in line 4
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", "")); in line 5
 
 // d) Identify all the lines that are variable declarations
 
+let carPrice = "10,000";  línea 1
+let priceAfterOneYear = "8,543";  línea 2
+const priceDifference = carPrice - priceAfterOneYear;  línea 6
+const percentageChange = (priceDifference / carPrice) * 100;  línea 7
+
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+become a price that is string with comas fixed ready to run and show the %
+*/

Sprint-1/3-mandatory-interpret/2-time-format.js

@@ -11,15 +11,37 @@ console.log(result);
 
 // For the piece of code above, read the code and then answer the following questions
 
+
 // a) How many variable declarations are there in this program?
+/* 6 variables 
+movieLength
+remainingSeconds
+totalMinutes
+remainingMinutes
+totalHours
+result
 
 // b) How many function calls are there?
+1 call
+console.log(result)
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
+% is the modulo operator.
+It returns the remainder of dividing movieLength by 60.
+In this case: it calculates how many seconds are left over after counting the full minutes.
+
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
 
+First, subtract the remaining seconds to get only the whole seconds in minutes. Then, divide by 60 to convert seconds to whole minutes.
+
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 
+The result contains a string in the format: hours:minutes:seconds
+movieDurationString
+
+
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+
+It works for positive numbers of seconds. */

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -1,4 +1,4 @@
-const penceString = "399p";
+/*const penceString = "399p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
@@ -25,3 +25,20 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+/* 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1);
+Use .substring(start, end) to remove the last character (p) from the string.
+penceString.length - 1  index of the last character excluding p
+3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+Use .padStart(targetLength, "0") to ensure the chain has at least 3
+4. `const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);`
+
+`Extracts the digits from the pounds.` `paddedPenceNumberString.length - 2` → leaves the last two digits for the pence.`
+5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+
+.substring(start)  takes the last two characters, which represent the penny
+
+.padEnd(2, "0")  ensures there are always two digits, padding with 0 if necessary
+6. console.log(£${pounds}.${pence});
+
+Builds a string in the standard price format: £pounds.pence
+

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

@@ -1,14 +1,22 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> not return value so is undefined
 
 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
+/* =============> Problem: The function is printing the result, but not returning it.
+In template strings, you need the function to return a value (return) for it to appear there.
 
 // 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

@@ -1,5 +1,7 @@
-// Predict and explain first...
+/* Predict and explain first...
 //  =============> write your prediction here
+The `sum` function has a `return` statement on one line and then `a + b` on another.
+In JavaScript, if you put `return` alone, without a value, on the same line, the function returns `undefined`.*/
 
 function sum(a, b) {
   return;
@@ -8,6 +10,16 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+/* =============> 
+  The return statement terminates the function's execution on that line.
+The expression a + b is never executed.
+
 // 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

@@ -14,11 +14,28 @@ 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 
+// La función getLastDigit no toma ningún parámetro y always usa la variable global num que es 103.
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+
+//  getLastDigit no recibe un número como argumento, así que ignora los valores que se pasan en los console.log.
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+function getLastDigit(number) {
+  return number.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
+
+/* getLastDigit wasn't using the parameter because it had no defined parameters.
+The correct function should take a number and return its last digit using .toString().slice(-1).

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

@@ -14,6 +14,8 @@
 // Then when we call this function with the weight and height
 // 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
-}
+
+/function calculateBMI(weight, height) {
+    const bmi = weight / (height * height); // calcular el BMI
+    return bmi.toFixed(1); // redondear a 1 decimal y devolverlo como string
+}

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
+
+/* Answer*/
+function toUpperSnakeCase(str) {
+    return str.toUpperCase().replaceAll(" ", "_");
+}
+/* str.toUpperCase()  converts all text to uppercase
+.replaceAll(" ", "_")  replaces all spaces with underscores
+return  returns the transformed string */
+
+

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

@@ -4,3 +4,25 @@
 // 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
+
+
+/* ANSWER */
+
+function toPounds(penceString) {
+    //  Quitar la letra "p" al final
+    const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1);
+
+    // AsegurarMe de que la cadena tenga al menos 3 dígitos
+    const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+
+    // Extraer los dígitos de las libras
+    const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
+
+    // Extraer los dígitos de los pence
+    const pence = paddedPenceNumberString
+        .substring(paddedPenceNumberString.length - 2)
+        .padEnd(2, "0");
+
+    // Devolver el resultado como string formateado
+    return `£${pounds}.${pence}`;
+}

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

@@ -11,24 +11,38 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
-// You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
+/* 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
+3 times
+pad(totalHours)
+pad(remainingMinutes)
+pad(remainingSeconds)
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
+0
+seconds = 61
+remainingSeconds = 61 % 60 = 0
+totalMinutes = (61 - 1)/60 = 60/60 = 1
+remainingMinutes = 1 % 60 = 1
+totalHours = (1 - 1)/60 = 0/60 = 0
 
 // b) What is the value assigned to num when pad is called for the first time?
 // =============> write your answer here
+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
+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
+// 01 */