feat: complete sprint 2 coursework cleanly

Author: JohnRob-jnr

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

@@ -1,13 +1,13 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  A) Error message - str has already been declared
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
+// =============> write your new code here
+
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+  let capitalisedStr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalisedStr;
 }
-
-// =============> write your explanation here
-// =============> write your new code here
+console.log(capitalise("hello there"));

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

@@ -1,20 +1,26 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> Decimal number is declared twice in the same scope 
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
+/*function convertToPercentage(decimalNumber) {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(decimalNumber);*/
 
 // =============> write your explanation here
+// Decimal number is declared twice & also set as a parameter which causes the syntaxError.
 
 // 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));

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

@@ -1,20 +1,25 @@
 
 // Predict and explain first BEFORE you run any code...
 
+//The input to the function is a number, but the function is trying to use that number as a variable name.
 // 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) {
+/*function square(3) {
     return num * num;
-}
+}*/
 
 // =============> write the error message here
+//SyntaxError: Unexpected number
 
 // =============> explain this error message here
+// Function parameter '3' is a literal value, not a parameter. Javascript expects a text name for the parameter.
 
-// Finally, correct the code to fix the problem
 
-// =============> write your new code here
+// Finally, correct the code to fix the problem
 
+function square(num) {
+    return num * num;
+}
 

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

@@ -1,14 +1,21 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> Error because console.log is within the multiply function does not return a value 
+
 
 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
+// =============> The console.log inside the function multiply is read first & prints the result of multiplying 10 and 32 - 320, to the console.  
+// But the aim of the function which was tryin to return it in the template literals is left as undefined because the multiply function does not return a value
+//   
 
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+
+
+function multiply(a, b) {
+  return a * b;
+}

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

@@ -1,13 +1,20 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> The function won't return the sum of a and b because the return is between the
+//  return statement and the expression a + b.
 
-function sum(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)}`);*/
+
+// =============> returns undefined because the empty return tells the function to return nothing, so the function returns undefined.
 
-// =============> 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)}`);

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
+// It will return the last digit of the number 103 which is 3 because the function getLastDigit is using the variable num which is set 
+// in the const num = 103; and not the parameter passed to the function getLastDigit. 
 
-const num = 103;
+/*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)}`);
+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
+
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> as explained above, the const num = 103; is being used in the function getLastDigit instead of the parameter passed to the function.
 // 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
+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)}`);
+
+

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
-}
+    const heightSquared = height * height;
+    const bmi = weight / heightSquared;
+    return bmi.toFixed(1);
+}
+
+console.log(calculateBMI(70, 1.73)); 

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(inputString) {
+    const upperCaseString = inputString.toUpperCase();
+    const upperSnakeCaseString = upperCaseString.replace(/ /g, "_");
+    return upperSnakeCaseString;
+}
+
+console.log(toUpperSnakeCase("lord of the rings"));

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

@@ -4,3 +4,27 @@
 // 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("1p")); 
+console.log(toPounds("90p"));
+console.log(toPounds("303p"));
+console.log(toPounds("23456p"));

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

@@ -21,18 +21,18 @@ function formatTimeDisplay(seconds) {
 // 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
+// =============> 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> 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
+// =============> 1, the modulo  % operator means that 61 gives a remainder of 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, this is so the 1 is padded with a leading 0 to make it 2 characters long.