London | 26-ITP-Jan | Johnny Vargas | Sprint 2 | Coursework

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> Error due to "let str", str already exists due to being created by "capitalise(str)"
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -8,6 +8,13 @@ function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
+console.log(capitalise("hello world"));
 
-// =============> write your explanation here
+// =============> The error spells it out "SyntaxError: Identifier 'str' has already been declared"
 // =============> write your new code here
+
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+console.log(capitalise("hello world"));

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
+// =============> Similar to previous js, "const decimalNumber" already exists due to "convertToPercentage(decimalNumber)"
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +14,17 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> "const decimalNumber = 0.5;" should come before the function...? However I didn't notice another problem if I did that until I tried it was console.log is going to just grab the 0.5 that has nothing done to it, skipping the function. To correct this I changed it to "console.log(convertToPercentage(decimalNumber))"
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+const decimalNumber = 0.5;
+
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+
+console.log(convertToPercentage(decimalNumber));

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
+// =============> I am not sure but I do not think that (3) should be there in that way....
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
+// =============> SyntaxError: Unexpected number
 
-// =============> explain this error message here
+// =============> It doesn't like there being a number in "function square(3)" I also noticed obviously that return of num was not being told what num was anywhere at all.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num) {
+    return num * num;
+}
+console.log(square(50))

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

@@ -1,14 +1,21 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> Why are there 2 console.logs? I am not sure how to explain but I don't think it will work because of that.
 
 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
+// =============> Well nothing is being returned so the outside console.log is just printing undefined. I will change the first console.log into a const and return that for the function.
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function multiply(a, b) {
+  const result = (a * b);
+  return result;
+}
+
+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 being by it self and just ending with a ; is definitely just going to return nothing.
 
 function sum(a, b) {
   return;
@@ -8,6 +8,12 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> Return is not returning the a + b because it is cut off by the ; and on a different 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
+// =============> All the console.logs will say "3" because of "const num = 103;" is going to be where they will all grab from because "function getLastDigit()" is empty instead of num.
 
 const num = 103;
 
@@ -14,11 +14,21 @@ 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
+// =============> All the console.logs are outputting "3" as the answer.
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> Because in the function getLastDigit only .slice(-1) is functioning and it is taking the num value from "const num = 103;"
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+const num = 103;
+
+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 +15,8 @@
 // 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 ** 2);
+    return Number(bmi.toFixed(1));
+}
+
+console.log("Your BMI is: " + calculateBMI(70, 1.73))

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

@@ -14,3 +14,10 @@
 // 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 snake(text) {
+    return text.toUpperCase().replaceAll(" ", "_");
+}
+
+console.log(snake("hello there"))
+console.log(snake("lord of the rings"))

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

@@ -4,3 +4,25 @@
 // 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("10449p"));

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

@@ -11,24 +11,26 @@ 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
+// =============> 3, in "return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(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
+// =============> 0, there are no hours in 61 seconds. (first is totalHours)
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> "00", as there are 0 hours it pads it to 00 at least.
 
 // 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, as it is 1 over 60 and the 60 gets turned into remainingMinutes
 
 // 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", the last call is "${pad(remainingSeconds)}" which is the previous 1 padded into 01.