restore sprint-2 from origin/main

Author: TzeMingHo

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

@@ -1,29 +1,13 @@
 // Predict and explain first...
 //  =============> write your prediction here
-// I guess the function is trying to capitalise the first letter of the string,
-// capture the rest of the string from index 1 to the end of the string,
-// and concatenate them together to return the capitalised 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)}`;
   return str;
 }
-*/
 
 // =============> write your explanation here
-// After calling the function capitalise with a string input,
-// I got a syntax error that "str" has already been declared.
-// This is because str has already been declared as a parameter of the function,
-// when a new variable named str, it causes a conflict.
-
 // =============> write your new code here
-// I renamed the new variable to capitalisedStr to avoid the conflict
-
-function capitalise(str) {
-  let capitalisedStr = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return capitalisedStr;
-}
-console.log(capitalise("hello")); // should return "Hello"

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

@@ -1,18 +1,10 @@
 // Predict and explain first...
-// At the first glance, I believe the function would occur errors because the variable decimalNumber is declared twice.
-// Besides, console.log is trying to log a variable that is not defined in global scope.
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-// The first error should be a syntax error that "decimalNumber" has already been declared.
-// Since decimalNumber is declared as a parameter of the function,
-// when a new variable also named decimalNumber is declared inside the function,
-// it causes a conflict.
-
-// The second error should be a reference error 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}%`;
@@ -21,19 +13,8 @@ function convertToPercentage(decimalNumber) {
 }
 
 console.log(decimalNumber);
-*/
 
 // =============> write your explanation here
-// After running the code, I got a syntax error that "decimalNumber" has already been declared.
-// I also found out that the decimalNumber inside the function should be declared again.
-// Besides, if we want to log the result of the function, we should call the function with an argument inside console.log().
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
-function convertToPercentage(decimalNumber) {
-  const percentage = `${decimalNumber * 100}%`;
-
-  return percentage;
-}
-console.log(convertToPercentage(0.5)); // should return "50%"
-console.log(convertToPercentage(0.75)); // should return "75%"

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

@@ -1,27 +1,20 @@
+
 // 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 guess the error is a reference error because the parameter is not defined correctly.
-/*
+
 function square(3) {
     return num * num;
 }
-*/
+
 // =============> write the error message here
-// function square(3) {
-//                 ^
-//SyntaxError: Unexpected number
-// In fact, the error is a syntax error because number 3 is unexpected here.
 
 // =============> explain this error message here
-// Number 3 is not a valid parameter name, which is misplacing and causes a syntax error.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-function square(num) {
-  return num * num;
-}
-console.log(square(3)); // should return 9
+
+

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

@@ -1,24 +1,14 @@
 // Predict and explain first...
 
 // =============> write your prediction here
-// It seems the function multiply did not return any value.
-// Therefore, it is like a console.log returning undefined, while it is inside another console.log.
-// So the output should be "The result of multiplying 10 and 32 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
-// After running the code, I got a separate output of 320 and "The result of multiplying 10 and 32 is undefined".
-// This is because the function multiply does not return any value, so it returns undefined by default.
-// The console.log inside the function multiply prints 320 when the function is called.
 
 // 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)}`); // should return "The result of multiplying 10 and 32 is 320"

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

@@ -1,23 +1,13 @@
 // Predict and explain first...
 //  =============> write your prediction here
-// It looks like the function sum return nothing because a+b is written in the next line after return statement.
-// Therefore, the output should be "The sum of 10 and 32 is undefined".
 
-/*
 function sum(a, b) {
   return;
   a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
-*/
-// =============> write your explanation here
-// After running the code, I got "The sum of 10 and 32 is undefined".
-// The return statement ends the function execution and a+b is never evaluated.
 
+// =============> write your explanation here
 // 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)}`); // should return "The sum of 10 and 32 is 42"

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

@@ -2,42 +2,23 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
-// The output should always be 3 because the parameter is not defined in the function,
-// and the variable num is always 103 in the global scope.
 
 const num = 103;
-/*
+
 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
 // =============> write the output here
-/*
-The last digit of 42 is 3
-The last digit of 105 is 3
-The last digit of 806 is 3
-*/
-// As expected, the output is always 3.
-
 // Explain why the output is the way it is
 // =============> write your explanation here
-//The num is defined in the global scope as 103.
-// And the function does not accept any parameters.
-// So every time the function is called, it returns the last digit of 103, which is 3.
-
 // 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)}`); // should return 2
-console.log(`The last digit of 105 is ${getLastDigit(105)}`); // should return 5
-console.log(`The last digit of 806 is ${getLastDigit(806)}`); // should return 6
 
 // 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

@@ -15,9 +15,5 @@
 // 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
-  const bmi = weight / (height * height);
-  return bmi.toFixed(1);
-}
-
-console.log(calculateBMI(70, 1.73)); // should return 23.4
+    // return the BMI of someone based off their weight and height
+}

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

@@ -14,11 +14,3 @@
 // 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")); // should return "HELLO_THERE"
-console.log(toUpperSnakeCase("lord of the rings")); // should return "LORD_OF_THE_RINGS"

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

@@ -4,64 +4,3 @@
 // 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
-
-/* Code from Sprint-1 below for reference
-const penceString = "399p";
-
-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}`);
-*/
-
-function toPounds(penceString) {
-  if (typeof penceString !== "string" || !penceString.endsWith("p")) {
-    console.log("Invalid input, please provide a penceString ending with 'p'");
-    return "Invalid input, please provide a penceString ending with 'p'";
-  }
-
-  const penceStringWithoutTrailingP = penceString.substring(
-    0,
-    penceString.length - 1
-  );
-
-  if (Number.isNaN(Number(penceStringWithoutTrailingP))) {
-    console.log("Invalid input, please provide a numeric penceString");
-    return "Invalid input, please provide a numeric penceString";
-  }
-
-  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}`);
-  return `£${pounds}.${pence}`;
-}
-
-toPounds("399p");
-toPounds("5p");
-toPounds("89p");
-toPounds("1234p");
-toPounds("0p");
-toPounds("70000p");
-toPounds("abcp");
-toPounds(500);
-toPounds("abc");

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

@@ -1,11 +1,4 @@
-let timesToBeCalled = 0;
-
 function pad(num) {
-  timesToBeCalled += 1;
-  console.log(
-    ` Pad has been called ${timesToBeCalled} times and num is ${num}`
-  );
-  console.log(` The return value will be ${num.toString().padStart(2, "0")}`);
   return num.toString().padStart(2, "0");
 }
 
@@ -18,36 +11,24 @@ 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
-// The pad function will be called 3 times when formatTimeDisplay is called.
-// 1st: for totalHours
-// 2nd: for remainingMinutes
-// 3rd: for 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
-// The value assigned to num is 0 when pad is called for the first time because 61 seconds is 0 hours, 1 minute, and 1 second.
 
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
-// The return value of pad is "00" in string format because 0 is padded 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
-// The value assigned to num is 1 when pad is called for the last time.
-// It is because the remaining seconds is 1 second after taken 60 seconds for 1 minute.
 
 // 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 assigned to num is "01" in string format.
-// It is because 1 second is padded to 2 digits with a leading zero.