Sheffield | ITP-Jan-26 | Hayriye Saricicek | Sprint 2 | Module Structuing and Testing Data

.gitignore

@@ -1,4 +1,4 @@
 node_modules
 .DS_Store
-.vscode
-**/.DS_Store
+.vscode/
+**/.DS_Store

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+// I think this function capitalise is meant to make the first letter of a string into uppercase then return the string
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +9,11 @@ function capitalise(str) {
   return str;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+// I got the error "SyntaxError: Identifier 'str' has already been declared" 
+// to fix this, I just removed the word let in line 8. This gave a value to str without trying to declare it again
+// I ran the new code and there were no errors
+
+//  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
+// =============> decimalNumber is defined within the function so it will not be recognised in console.log(decimalNumber);
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +14,24 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============>  this is a function to convert a decimal number to a percentage - function declared
+// the decimal number is declared as 0.5  
+// percentage is calculated by multiplying the decimal // number by 100 and then adding the % symbol 
+// the answer returned is named percentage and gives a // number followed by %
+// the answer will be printed in console
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> // the error was actually 'decimalNumber' has already been declared
+// this was because decimalNumber was declared inside the function convertToPercentage(decimalNumber)
+// and declared again within the function with the const statement
+// once const decimalNumber = 0.5; was moved outside the function this error was resolved
+// that way the global decimalNumber exists and the function can still accept it as an argument
+
+
+// const decimalNumber = 0.5;
+// function convertToPercentage(decimalNumber) {
+//   const percentage = `${decimalNumber * 100}%`;
+//   return percentage;
+// }
+// console.log(decimalNumber);
+

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

@@ -3,18 +3,33 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> I think that return can only return a value not do a calculation 
+// so this will return an error because it is trying to do a calculation instead of returning a value
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
 
-// =============> explain this error message here
+function square(3) {
+    return num * num;
+}
+
+// =============> SyntaxError: Unexpected number
+
+// =============> this is because variables and parameters in functions cannot start with a number or be a number
+// however, return can be used for calculations so my prediction was wrong
+
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
+// =============> 
+// function square (num) {
+//   return num * num;
+// }
+// console.log(square(5));
+
+// ran console.log to ensure it works
+
 
 

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

@@ -1,14 +1,31 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> when the console.log outside the function is performed $(multiply(10, 32)) 
+// it will print the text The result of multiplying by 10 and 32 is
+// but then will state undefined for the 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
+// =============> there is no return 
+// console.log(a*B) printed the result of multiplying a and b but because there is no return 
+// the answer was not returned to the function so the console.log outside the function did not 
+// receive the value and printed undefined instead
+
 
 // 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)}`);
+
+// I removed the first console.log because it didn't seem necessary to print out 320
+// if you need to print 320 as well as the final console-log statement then console.log(a * b) 
+// can be added back in but it would need to be before the return statement because if it is
+// after the return statement it will never be reached and the value will not be printed out
+

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

@@ -1,5 +1,7 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> the function will not perform a + b and will return undefined in the 
+ console.log function
+
 
 function sum(a, b) {
   return;
@@ -8,6 +10,14 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> there shouldn't be a semi-colon after return
+// this will signify the end of function so a + b will not be performed therefore there 
+// is no answer to return to print in the console.log function
+
 // 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 +1,10 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> the function has no parameter so will use the 
+// global value of num for num.toString which means it will always 
+// return 3 which is the last digit of 103
+
 
 const num = 103;
 
@@ -14,11 +17,38 @@ 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
+
+
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> the function has no parameter so will use the 
+// global value of num for num.toString
+
 // 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)}`);
+
+// removed  const num = 103; and then added num as a parameter to the function 
+// getLastDigit so that it can take in the value of num when the function is 
+// called and return the last digit of that number instead of always using 
+// the global value of num which was 103.
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+
+// num was not declared within the function so the global value of num in the 
+// the const declaraton was used for each number
+//I corrected this by putting num as a parmaeter for the function so that it can take 
+//in the value of num when the function is run for any number and return the last digit 
+//of the number instead of always using the fixed value of num which was 103.
+//I also removed the const declaration of num because it was not needed and was causing 
+//confusion as to which value of num was being used in the function.
+

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

@@ -16,4 +16,10 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
+    // this will be a number to 1 decimal place
+    const bmi = weight / (height * height);  //calculation to calculate BMI
+    return Number(bmi.toFixed(1));  
+}
+console.log(calculateBMI(70, 1.73));
+
+// tested and it works, the function calculates the BMI correctly and returns it to 1 decimal place.

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

@@ -14,3 +14,20 @@
 // 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 str.toUpperCase().split('').map(function(c) {  
+    // splits string into individual characters and maps each character to a new value
+
+        return /[A-Z0-9]/.test(c) ? c : '_';
+        // checks if the character is an uppercase letter or a digit
+
+    }).join('');
+  // joins the array of characters back into a single string and replaces spaces or special 
+  // characters such as "?" with underscores
+}
+
+console.log(toUpperSnakeCase("there-once was/a young lady from+London"));
+console.log(toUpperSnakeCase("hello.world! test+123"));
+

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

@@ -4,3 +4,21 @@
 // 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 getPenceString(penceString){
+
+const penceStringWithoutTrailingP = penceString.substring(0,penceString.length - 1);
+    //removes p
+const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+    //puts zeros in front of number if less than 3 digits
+const pounds = paddedPenceNumberString.substring(0,paddedPenceNumberString.length - 2);
+    //removes last 2 digits to get pounds
+const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+    //gets last 2 digits to get pence, if less than 2 digits adds zeros to end of string but shouldnt be less than 3
+    //due to padStart above
+return `£${pounds}.${pence}`;
+    // returns string with pounds and pence in correct format
+}
+
+console.log(getPenceString("399p"));
+    // tested with 123p 1200p 24589p 89p 9p and 0p

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

@@ -10,25 +10,43 @@ 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
+// =============> pad will be called 3 times, once for pad(totalHours, 
+// once for (pad)remainingMinutes and once for (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
+// =============> The first call to pad is pad(totalHours).
+//totalHours is calculated as totalMinutes // 60.
+//For the input 61, seconds is 61, remainingSeconds is 1, and totalMinutes is 1.
+//So, totalHours is 1 // 60 = 0.
+//Therefore, num is assigned the value 0 when pad is called for the first time.
+
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> The first call to pad is pad(totalHours).
+//totalHours is calculated as totalMinutes // 60.
+//For the input 61, totalMinutes is (61 - 1) // 60 = 1.
+//So, totalHours is 1 // 60 = 0.
+//pad(0) returns the string representation of 0, padded with zeros to a minimum length of 2, which is "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
+// =============> We look at the last call to pad, which is pad(remaining_seconds).
+//remaining_seconds is calculated as seconds % 60.
+//For the input 61, seconds % 60 equals 1.
+//So, pad(remaining_seconds) is equivalent to pad(1). The value assigned to num in the last call to pad is 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
+// =============> For the input 61, remaining_seconds will be 1. So, pad(1) will return "01". 
+// Therefore, the value assigned to num is 1.

Sprint-2/5-stretch-extend/format-time.js

@@ -23,3 +23,5 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+console.log formatAs12HourClock("14:00"); // should return "2:00 pm"