London | 25-ITP-SEP | Sophia Mohamed | Sprint 2 | coursework/sprint-2

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> This code will give an error message
 
 // 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 new code here
+// =============> it gave an error because the variable str is being declared twice one with the function and another one with anew variable 
+// =============> this can be fixed by changing the variable name inside the function
+function capitalise(str) {
+  let capitalised = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalised;
+}
+console.log(capitalise("sophia")); // Output: "Sophia"

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 can see that the variable decimalNumber is being declared twice once as a  function parameter and again as a constant 
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +14,18 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> so the function is to convert a decimal number into a percentage
+// so if the number is 0.5 it is multiplied by 100
+//  % sign is added at the end to make it 50%
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> the problem can be fixed by removing the redeclaration of the variable decimalNumber inside the function
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage;
+}
+
+// Call the function and store the result in a variable
+const result = convertToPercentage(0.5);
+console.log(result); 
+

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

@@ -3,18 +3,29 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> First there is a number inside the function which is not allowed in JavaScript it should be a variable name
+//the second mistake is num is not declared
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
+// =============> Uncaught SyntaxError: Unexpected number
+// =============> we put a number (3)where JavaScript expected a variable name 
+//Uncaught SyntaxError: Illegal return statement
 
-// =============> explain this error message here
+//we cant use return inside the function without declaring the function properly
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
+
+// =============> 
+function square(num) {
+  return num * num;
+}
+console.log(square(3));  // the answer should be 9
+console.log(square(5));  // the answer should be 25
+console.log(square(10)); // the answer should be 100
+
 
 

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

@@ -1,14 +1,20 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> console.log will print the result because log()will write the message to the console.
+//
 
 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
-
+// =============> When testing the code in Node.js, the output was  320 without the message because it was undefined "The result of multiplying 10 and 32 is undefined".
+//we need to use return to store the result then print it out. 
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> // Corrected Code:
+function multiply(a, b) {
+  return a * b; // Use 'return' instead of 'console.log'
+}
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> i think there will be and error message because at doesn't show what value to return so it will be undefined.
 
 function sum(a, b) {
   return;
@@ -8,6 +8,10 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// ============= it should be in the same line after return statement to return the value
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> corrected code:
+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

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> I predict that the code might not work because I am declaring num outside the function also I am giving num a constant value means it will always be 103
 
 const num = 103;
 
@@ -14,11 +14,19 @@ 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
+// =============> the code worked but the answer was 3 i predicted an error message.
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> the output was 3 because at the beginning  it we declared that num value as 103
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> corrected code is running the code without giving num any value  and add num in the function 
+
+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
+// Explain why getLastDigit is not working properly - it was not working at the start because every time we run the code would slice the last number of the 103 because we declared num as a constant with value 103 

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

@@ -14,6 +14,17 @@
 // 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
-}
+// I have made a small change to the test cases to ensure they match the expected output to 1 decimal place
+   function calculateBMI(weight, height) {
+  // Calculate BMI using the formula: weight (kg) / (height (m) * height (m))
+  const bmi = weight / (height * height);
+
+  // Round to 1 decimal place and return
+  return bmi.toFixed(1);
+}
+
+// Test cases
+console.log(calculateBMI(85, 1.54)); // 35.8
+console.log(calculateBMI(60, 1.65)); // 22.0
+console.log(calculateBMI(72, 1.80)); // 22.2
+// now the function is reusable and correct.

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

@@ -14,3 +14,14 @@
 // 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
+
+// There is 2 things we need to do: change the space to_ and change the letters from lowercase to uppercase
+
+function toUpperSnakeCase(str) {
+  return str
+    .replaceAll(' ', '_')  // replace spaces with underscores
+    .toUpperCase();        // make everything uppercase
+}
+
+console.log(toUpperSnakeCase("hello there"));         
+console.log(toUpperSnakeCase("lord of the rings"));

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

@@ -4,3 +4,13 @@
 // 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(kg) {
+  const pounds = kg * 2.20462;
+  return `${pounds.toFixed(2)} lbs`; // returns a string
+}
+
+// Test cases 
+console.log(toPounds(1));   //the output "2.20 lbs"
+console.log(toPounds(5));   //the output is  "11.02 lbs"
+console.log(toPounds(10)); //the output is  "22.05 lbs"

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

@@ -17,18 +17,22 @@ function formatTimeDisplay(seconds) {
 // 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:
 
 // b) What is the value assigned to num when pad is called for the first time?
-// =============> write your answer here
+// =============> 0 first value is totalHours
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> "00" because the target length is 2 digits
 
 // 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 this is last value is remaining in Seconds
 
 // 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 because the target length is 2 digits