London | ITP-Jan-26 | Maryanne Mosonik | Sprint 2 | Coursework

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> there are two declarations of the variable str. 
 
 // 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
+// =============> str is declared twice in the function capitalise and using let. 
+
+// =============> we delete the 'let'
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}

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
+// =============> The variable decimalNumber has been declared twice and will retun an error.
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +14,14 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> The variable decimalNumber has been declared twice and returned an error saying it had already been declared. There is also a console log error as it is trying to use a variable that is inside the function and hasn't been declared outside. 
+
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  console.log(percentage);
+  return percentage;
+}
+//We can also use console log inside the function. 

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

@@ -3,18 +3,21 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> the error message will be about 'num' not being declared. 
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
+// =============> Uncaught SyntaxError: Illegal return statement. 
 
-// =============> explain this error message here
+// =============> The error message is because this num is not a valid variable as it has been undeclared. 
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+function square(num) {
+    return num * num;
+}
 
 

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

@@ -1,14 +1,19 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> there is no return statement, therefore, you cannot use the result of the function in a console log. The function will run but it will return 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
+// =============> you need to add a return statement in order to use the result and so it can be displayed on the console. 
 
 // 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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> return statement is on a new line, therefore there will be an error. 
 
 function sum(a, b) {
   return;
@@ -8,6 +8,11 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> return statement should be on the same line. 
 // 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

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> num has already been declared as 103, therefore, no other number can be used. 
 
 const num = 103;
 
@@ -14,11 +14,18 @@ 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 is always 3 because no other inputs are allowed.
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> No other inputs are allowed as num will always be defined as 103.
 // 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

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

@@ -15,5 +15,6 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
+    return (weight / (height * height)).toFixed(1);
     // return the BMI of someone based off their weight and height
 }

Sprint-2/3-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 upperSnakeCase(sentence) {
+    const upperCase = sentence.toUpperCase();
+    const snakeCase = upperCase.replaceAll(" ", "_");
+    return snakeCase;
+}
+console.log(upperSnakeCase("hello there"));

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

@@ -4,3 +4,11 @@
 // 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("399p"));

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

@@ -17,18 +17,19 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> 3 times, once for totalHours, once for remainingMinutes and once 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
+// =============> 1 because the first operation is 61 % 60 which gives us 1
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> 00 because the first operation is totalHours which is 0 and it is padded to 2 digits with a 0 in front of it.
 
 // 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 because the last operation is 1 % 60 which gives us 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
+// =============> 01 because the last operation on the return line is remainingSeconds which is 1 and it is padded to 2 digits with a 0 in front of it.
+