London | 26-ITP-Jan | Alex Okorefe| Sprint 2 | Coursework

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

@@ -1,5 +1,6 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> The code will throw an error because the variable str is a reserved keyword in JavaScript and cannot be used as a variable name.
+//                 The error message will likely indicate that there is a syntax error or that the variable name is invalid.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +10,25 @@ function capitalise(str) {
   return str;
 }
 
+console.log(str);
+
 // =============> write your explanation here
+
+//  C:\Users\alexo\CYF\Module-Structuring-and-Testing-Data\Module-Structuring-and-Testing-Data\Sprint-2\1-key-errors\0.js:8
+//  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//      ^
+
+// SyntaxError: Identifier 'str' has already been declared
+
+// The error message indicates that there is a syntax error in the code because the variable name 'str' has already been declared.
+
+// In the function capitalise, the parameter 'str' is declared as a variable name, and then within the function body, there is another declaration of 'str' using the let keyword.
+// This creates a conflict because 'str' is already declared as a parameter, and it cannot be redeclared as a variable within the same scope.
+
 // =============> write your new code here
+function capitalise(str) {
+  let capitalised = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalised;
+}
+
+console.log(capitalise("alex"));

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

@@ -1,20 +1,30 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> It will likely be a reference error because the variable decimalNumber is not defined in the global scope
+//                and is only declared within the function convertToPercentage. When we try to log decimalNumber outside of the function,
+//                it will not be accessible and will throw an error indicating that decimalNumber is not defined.
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+//function convertToPercentage(decimalNumber) {
+//const decimalNumber = 0.5;
+//const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+//return percentage;
+//}
 
-console.log(decimalNumber);
+//console.log(decimalNumber);
 
 // =============> write your explanation here
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage(a) {
+  const decimalNumber = 0.5;
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+console.log(convertToPercentage(0.5));

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

@@ -1,20 +1,25 @@
-
 // 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
+// =============> the code will throw a syntax error because the parameter name '3' is not a valid identifier in JavaScript.
+//                  The error message will likely indicate that there is an unexpected number or that the parameter name is invalid.
 
-function square(3) {
-    return num * num;
-}
+//function square(3) {
+//    return num * num;
+//}
 
-// =============> write the error message here
+// =============> C:\Users\alexo\CYF\Module-Structuring-and-Testing-Data\Module-Structuring-and-Testing-Data\Sprint-2\
+//                1-key-errors\2.js:9 function square(3) {SyntaxError: Unexpected number
 
-// =============> explain this error message here
+// =============> We get an unexpected number error because the parameter name '3' is not a valid identifier in JavaScript.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+  return num * num;
+}
 
+console.log(square(4));

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

@@ -1,14 +1,21 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> The funtion does not return a value, so when we try to log the result of the function call,
+// it will return undefined and log "The result of multiplying 10 and 32 is undefined" to the console.
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+//function multiply(a, b) {
+//  console.log(a * b);
+//}
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+//console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> 320 The result of multiplying 10 and 32 is undefined
 
 // 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

@@ -1,13 +1,22 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> the return statement is placed before the actual sum,
+// which means that the function will return undefined before it can calculate the sum of a and b.
+// Therefore, the output will be "The sum of 10 and 32 is undefined".
 
-function sum(a, b) {
-  return;
-  a + b;
-}
+//function sum(a, b) {
+// return;
+//a + b;
+//}
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+//console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> The program behaved as predicted
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function sum(a, b) {
+  add = a + b;
+  return add;
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

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

@@ -1,24 +1,34 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> The const num variable is assigned in the global scope and returned in the getLastDigit function.
+// The console logs lines 14-16 call the getLastDigit function due to this; the console will log "The last digit of 42 is 3",
+// "The last digit of 105 is 3", and
+// "The last digit of 806 is 3".
 
-const num = 103;
+//const num = 103;
 
-function getLastDigit() {
+//function getLastDigit() {
+//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)}`);
+
+// Now run the code and compare the output to your prediction
+// =============> The code performed as expected due to the declaration of num in the global and called in the function
+// =============>
+// Finally, correct the code to fix the problem
+// =============> write your new code here
+
+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)}`);
 
-// Now run the code and compare the output to your prediction
-// =============> write the output here
-// Explain why the output is the way it is
-// =============> write your explanation here
-// Finally, correct the code to fix the problem
-// =============> write your new code here
-
 // 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 bmi = weight / (height * height);
+  return Math.round(bmi * 10) / 10;
+}
+
+console.log(calculateBMI(85, 1.93));

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

@@ -14,3 +14,11 @@
 // 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 the string in UPPER_SNAKE_CASE
+  return str.toUpperCase().replaceAll(" ", "_");
+}
+
+console.log(toUpperSnakeCase("hello there"));
+console.log(toUpperSnakeCase("lord of the rings"));

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

@@ -4,3 +4,26 @@
 // 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("1399p"));
+console.log(toPounds("360p"));
+console.log(toPounds("55p"));
+console.log(toPounds("5p"));

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

@@ -11,24 +11,27 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+console.log(formatTimeDisplay(10002));
+
 // 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 will be called 3 times, once for each of the hours, minutes and seconds.
 
 // 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
+// =============> num is assigned the value of 0, because 61 seconds is equal to 1 minute and 1 second, so the total hours is 0.
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> The return value is "00", because pad pads the number 0 to 2 digits with leading zeros.
 
 // 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
+// =============> num is assigned the value of 1, because 61 seconds is equal to 1 minute and 1 second,
+//                so the remaining seconds 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
+// =============> The return value is "01", because pad pads the number 1 to 2 digits with leading zeros.