Complete Sprint 3 coursework

Author: MattCarolus10

Sprint-3/1-key-errors/0.js

@@ -1,13 +1,23 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  ======> write your prediction here: I predict that the code should cut out, and make the first letter of the string an uppercase letter,
+//  then add every letters that comes after
 
 // 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;
-}
+// function capitalise(str) {
+//  let str= `${str[0].toUpperCase()}${str.slice(1)}`
+//   return str;
+// }
+
+
+// =============> write your explanation here: The error read "SyntaxError: Identifier 'str' has already been declared",
+//  this is as a result of having two variables with same name. The error occoured in this code because the variable "str" has been decleared twice
 
-// =============> write your explanation here
 // =============> write your new code here
+
+function capitalise(str) {
+ let str2= `${str[0].toUpperCase()}${str.slice(1)}`
+  return str2;
+}
+console.log(capitalise("money"))

Sprint-3/1-key-errors/1.js

@@ -1,20 +1,38 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// Answer below:
+// A syntax error will occur for two reasons, first because there variable  const "decimalNumber" being redecleared 
+// The second reason is because the function "convertToPercentage" is not called correctly.
 
-// Try playing computer with the example to work out what is going on
+// =============> write your prediction here: 
+// Answer below:
+// I predicted that the code will not work because of the variable (decimalNumber) inside the function,
+// Also because the console.log(decimalNumber) is just a name that exist inside the function
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+// Try playing computer with the example to work out what is going on
+
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
 
-console.log(decimalNumber);
+//   return percentage;
+// }
+// console.log(decimalNumber);
 
 // =============> write your explanation here
+// Answer:
+
+// const decimalNumber redeclares the parameter name which causes a SyntaxError. 
+// also console.log(decimalNumber) outside fails because the parameter only exists inside the function"
 
 // 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(10.5));

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

@@ -1,20 +1,31 @@
 
 // Predict and explain first BEFORE you run any code...
+// Answer below:
+// The code will not work because the placeholder variable (3) should be an actual name like "num"
+
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
 // =============> write the error message here
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
+// The error message explains the error in the function parameter (3), the function expects a name parameter instead of a number.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+    return num * num;
+}
+console.log(square(10))
+
+
 

Sprint-3/2-mandatory-debug/0.js

@@ -1,14 +1,24 @@
 // Predict and explain first...
+// Answer below:
+// The code needs a value inside the console.log function to multiply, but no value was useed to replace the placeholder parameters
+// It should be an error, no value to return
 
 // =============> write your prediction here
 
-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
+// Answer below:
+// The original logs the product instead of returning it, so the function call inside the template string gives 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-3/2-mandatory-debug/1.js

@@ -1,13 +1,21 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// Code will not work because the paremeters should be on same line as return
 
-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 errors in this codes is the semi-colon in front of the return and the placeholder parameters not on same line as the return
 // 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-3/2-mandatory-debug/2.js

@@ -2,23 +2,48 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// Answer below:
+// There is a constant variable num with value 103, the code should print last digit of the constant variable.
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// 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)}`);
+// 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
+// Answer below:
+// The last digit of 42 is 3
+// The last digit of 105 is 3
+// The last digit of 806 is 3
+
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+// Answer below:
+// The code kept repeating same value for all log because of the constant variable decleared before the function and used inside 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)}`);
+
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+
+// Answer below:
+
+// The global constant variable outside the function has affected the code and caused it to always reference the last number of the global variable
+// To fix this, getLastDigit needed its own parameter, so num comes from whatever you pass in

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

@@ -15,5 +15,8 @@
 // It should return a string of their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
+  const bmi = weight / (height * height)
+  return bmi.toFixed(1)
   // return the BMI of someone based off their weight and height
 }
+console.log(`Your BMI is ${calculateBMI(100, 1.62)}`)

Sprint-3/3-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 upperCase(str) {
+    const returnUpperCase = str.toUpperCase().replaceAll(" ", "_")
+    return returnUpperCase
+}
+console.log(upperCase("what is your name mr man? "))

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

@@ -4,3 +4,43 @@
 // 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
+
+
+// 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(inPounds) {
+    const penceStringWithoutTrailingP = inPounds.substring(
+  0,
+  inPounds.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("599p"))

Sprint-3/4-mandatory-interpret/time-format.js

@@ -1,11 +1,15 @@
 function pad(num) {
+  // console.log(num)
   let numString = num.toString();
+  // console.log(numString, "numstr")
   while (numString.length < 2) {
     numString = "0" + numString;
   }
+  //  console.log(numString, "FULLNUM")
   return numString;
 }
 
+
 function formatTimeDisplay(seconds) {
   const remainingSeconds = seconds % 60;
   const totalMinutes = (seconds - remainingSeconds) / 60;
@@ -14,25 +18,38 @@ 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
+// =============> write your answer here 
+// Answer below:
+// Pad runs once for "totalHours", once "remainingMinutes" and once for "remainingSeconds" in total pad is called 3 times.
 
 // 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
+// =============> write your answer here 
+// Answer below:
+// The first pad is pad(totalHours) and the value is 0
 
 // c) What is the return value of pad when it is called for the first time?
 // =============> write your answer here
+// The value is 0 plus the "0" added to it to make the value 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
+// =============> write your answer here 
+// Answer below:
+// The last call is pad(remainingSeconds) and the value is 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
+// =============> write your answer here 
+// Answer below:
+// the return value initially is 1 and "0" was added to it in front to make the value 01