London | May-2026-itp | Vitalii Kmit | Sprint 2 | Coursework Exercises

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

@@ -1,13 +1,19 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// I think this function will capitalise a string
 
 // 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)}`;
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
 
 // =============> write your explanation here
+// the variable has already been declared when it was passed to the function
+//
 // =============> write your new code here
+
+const my_string = "hello world";
+console.log(capitalise(my_string));

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

@@ -2,19 +2,22 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+// I think the value "decimalNumber" is undeclared so it will not work
 
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+let decimalNumber = 0.5;
+console.log(convertToPercentage(decimalNumber));
 
 // =============> write your explanation here
+// The variable decimalNumber didn't need to be redefined in the function
+// Instead it should come from outside and be passed to the function
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here

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

@@ -1,20 +1,21 @@
-
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// I think it's because we're not passing in the argument properly
 
-function square(3) {
+function square(num) {
     return num * num;
 }
 
 // =============> write the error message here
+// SyntaxError: Unexpected token `numeric literal (3, 3)`. Expected yield, an identifier, [ or {
 
 // =============> explain this error message here
+// It means that we're putting 3 but it should be an identifier, such as "num"
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-
-
+// replaced 3 with num

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

@@ -1,14 +1,17 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// I think the function will not work because nothing is returned
 
 function multiply(a, b) {
-  console.log(a * b);
+  return a * b;
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
+// I was almost correct but I had to also remove the console.log()
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+// 10: return a * b;

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

@@ -1,13 +1,14 @@
 // Predict and explain first...
 //  =============> write your prediction here
+//  It won't run because there's a semicolon straight after return
 
 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
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+//  remove the semicolon

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

@@ -2,10 +2,10 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// I think it wont run because there's nothing passed into the function
+// also it is using the value of num outside of the function wich isn't correct
 
-const num = 103;
-
-function getLastDigit() {
+function getLastDigit(num) {
   return num.toString().slice(-1);
 }
 
@@ -14,11 +14,13 @@ 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
+// =============> it just returned 3
+
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> Because value is mistakenly defined outside of the function
+
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> pass num into the function and remove the constant 103 outside
 
 // 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

@@ -15,5 +15,9 @@
 // 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
-}
+  // return the BMI of someone based off their weight and height
+  const height_squared = Math.pow(height, 2);
+  return (weight / height_squared).toFixed(1);
+}
+
+console.log(calculateBMI(80, 1.8));

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

@@ -14,3 +14,9 @@
 // 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 to_snake(str) {
+  return str.toUpperCase().replaceAll(" ", "_");
+}
+
+console.log(to_snake("lord of the rings"));

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

@@ -4,3 +4,24 @@
 // 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");
+
+  return `£${pounds}.${pence}`;
+}
+
+console.log(toPounds("399p"));

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

@@ -12,27 +12,31 @@ function formatTimeDisplay(seconds) {
   const remainingMinutes = totalMinutes % 60;
   const totalHours = (totalMinutes - remainingMinutes) / 60;
 
+  console.log(remainingSeconds);
+
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+console.log(formatTimeDisplay(60001));
+
 // 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
 
 // 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 totalHours which equals to (totalMinutes - remainingMinutes) / 60
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> 16
 
 // 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 of pad when it is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> 01