Manchester | 26-ITP-Sep | Monsur Abdulrahman | Sprint 2 | Coursework/sprint 2

Sprint-2/1-key-exercises/1-count.js

@@ -4,3 +4,9 @@ count = count + 1;
 
 // Line 1 is a variable declaration, creating the count variable with an initial value of 0
 // Describe what line 3 is doing, in particular focus on what = is doing
+
+Line 3 updated the value of the variable "count". The "=" operator is an 
+assignment operator, which takes the value on the right side 
+("count + 1") and assigns it to the variable on the left side 
+("count"). So, it takes the current value of "count", adds 1 to it, and then 
+stores that new value back into "count"..

Sprint-2/1-key-exercises/2-initials.js

@@ -5,6 +5,7 @@ const lastName = "Johnson";
 // Declare a variable called initials that stores the first character of each string.
 // This should produce the string "CKJ", but you must not write the characters C, K, or J in the code of your solution.
 
-const initials = ``;
+const initials = firstName[0] + middleName[0] + lastName[0];
+
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn

Sprint-2/1-key-exercises/3-paths.js

@@ -17,7 +17,7 @@ console.log(`The base part of ${filePath} is ${base}`);
 // Create a variable to store the dir part of the filePath variable
 // Create a variable to store the ext part of the variable
 
-const dir = ;
-const ext = ;
+const dir = filePath.slice(0, lastSlashIndex);
+const ext = base.slice(base.lastIndexOf(".") + 1);
 
 // https://www.google.com/search?q=slice+mdn

Sprint-2/1-key-exercises/4-random.js

@@ -7,3 +7,21 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // Try breaking down the expression and using documentation to explain what it means
 // It will help to think about the order in which expressions are evaluated
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+
+num //represents a random integer between the minimum value (1) and the maximum value (100).Math
+
+(maximum - minimum + 1) //represents the range of possible values, which is 100 - 1 + 1 = 100. 
+// This means that there are 100 possible values that num can take on.
+
+Math.random() //generates a random decimal number between 0  and 1. This means that the value of Math.random() 
+// can be any number between 0 and 1, but it will never be exactly 1.
+
+Math.floor(Math.random() * (maximum - minimum + 1)) //multiplies the random decimal number generated by Math.random() 
+// by the range of possible values (100), and then rounds down to the nearest integer using Math.floor(). 
+// This means that the result will be a random integer between 0 and 99.
+
+Math.floor(Math.random() * (maximum - minimum + 1)) + minimum //adds the minimum value (1) to the result of the previous 
+// expression. This means that the final result will be a random integer between 1 and 100, inclusive.
+
+
+

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

@@ -1,2 +1,2 @@
-This is just an instruction for the first activity - but it is just for human consumption
-We don't want the computer to run these 2 lines - how can we solve this problem?
+//This is just an instruction for the first activity - but it is just for human consumption
+//We don't want the computer to run these 2 lines - how can we solve this problem?

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

@@ -1,4 +1,4 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;

Sprint-2/2-mandatory-errors/2.js

@@ -1,5 +1,6 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+

Sprint-2/2-mandatory-errors/3.js

@@ -1,9 +1,22 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);
+console.log(last4Digits);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
 // Before running the code, make and explain a prediction about why the code won't work
+
+The code is not working because the "slice" method is being used incorrectly. The "slice" 
+method should be called on the string "cardNumber" to extract the last 4 digits. However, 
+if there is a syntax error or if the variable "cardNumber" is not defined correctly, it could lead to an error.
+
 // Then run the code and see what error it gives.
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
+It gives an error because the "slice" method is being called on a string, but if the string is not defined correctly or 
+if there is a typo in the variable name, it will result in an error. This is what I predicted, as 
+I anticipated that the issue would be related to how the "slice" method is being used on the string.
+
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+I updated the expression to correctly use the "slice" method on the "cardNumber" string. I converted the cardNumber to a 
+string with the ("") and then used the slice method to extract the last 4 digits. 

Sprint-2/2-mandatory-errors/4.js

@@ -1,2 +1,2 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const TwelveHourClockTime = "8:53pm";
+const TwentyFourHourClockTime = "20:53";

Sprint-2/3-mandatory-interpret/1-percentage-change.js

@@ -2,7 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -12,11 +12,35 @@ console.log(`The percentage change is ${percentageChange}`);
 // Read the code and then answer the questions below
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
+There are five function calls in this file. The lines where function calls are made are:
+1. Line 4: carPrice.replaceAll(",", "")
+2. Line 5: priceAfterOneYear.replaceAll(",", "")
+3. Line 7: Number(carPrice.replaceAll(",", ""))
+4. Line 8: Number(priceAfterOneYear.replaceAll(",", ""))
+5. Line 10: console.log()
 
 // b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
 
+The error is occurring on line 5 because the "," character was ommited in the replaceAll function, to fix the problem,
+ we need to include the "," character in the replaceAll function like this: priceAfterOneYear.replaceAll(",", "")
+
 // c) Identify all the lines that are variable reassignment statements
 
+The lines that are variable reassignment statements are:
+1. Line 4: carPrice = Number(carPrice.replaceAll(",", ""));
+2. Line 5: priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+
 // d) Identify all the lines that are variable declarations
+The lines that are variable declarations are:
+1. Line 1: let carPrice = "10,000";
+2. Line 2: let priceAfterOneYear = "8,543";
+3. Line 6: const priceDifference = carPrice - priceAfterOneYear;
+4. Line 7: const percentageChange = (priceDifference / carPrice) * 100;
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+The expression "Number(carPrice.replaceAll(",", ""))" is performing two main operations:
+1. "carPrice.replaceAll(",", "")": This part of the expression removes all commas from the string representation of
+"carPrice". For example, it converts "10,000" to "10000".
+2. "Number(priceAfterOneYear.replaceAll(",", ""));": This part converts the resulting string (after removing commas) 
+into a numeric value. The purpose of this expression is to convert the string representation of a number that 
+may contain commas into an actual numeric value that can be used for mathematical calculations.

Sprint-2/3-mandatory-interpret/2-time-format.js

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = -9876; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -11,15 +11,41 @@ console.log(result);
 
 // For the piece of code above, read the code and then answer the following questions
 
+
 // a) How many variable declarations are there in this program?
+//There are six variable declarations in this program. The lines where variable declarations are made:
+//1. Line 1: const movieLength = 8784;
+//2. Line 3: const remainingSeconds = movieLength % 60;
+//3. Line 4: const totalMinutes = (movieLength - remainingSeconds) / 60;
+//4. Line 6: const remainingMinutes = totalMinutes % 60;
+//5. Line 7: const totalHours = (totalMinutes - remainingMinutes) / 60;
+//6. Line 9: const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
 
 // b) How many function calls are there?
+//There are two function calls in this program. The lines where function calls are made are:
+//1. Line 9: `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
+//2. Line 10: console.log(result);
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
+//The expression "movieLength % 60" calculates the remainder when the value of "movieLength" is divided by 60. 
+//In this context, it is used to determine the number of seconds remaining after converting the total movie 
+//length from seconds into minutes. Since there are 60 seconds in a minute, this operation effectively gives us the 
+//leftover seconds that do not make up a full minute. 
+
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//The expression assigned to "totalMinutes" in line 4 calculates the total number of minutes in the movie length. 
+//It does this by first subtracting the remaining seconds (calculated in line 3) from the total movie length in seconds. 
+//This gives the total number of seconds that can be fully converted into minutes. Then, it divides that value by 60 to 
+//convert the total seconds into total minutes. The result is the total number of complete minutes in the movie length, 
+//excluding any leftover seconds.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// The variable result represents the formatted time string in the format "hours:minutes:seconds".
+// A better name for this variable could be "formattedTime" or "movieDuration" 
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//The code will work for all positive integer values of movieLength, as it correctly calculates the hours, minutes, 
+//and seconds based on the total length in seconds. But will not work for negative values of movieLength, 
+//as it will produce negative hours, minutes, and seconds, which does not make sense in the context of a movie length.

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

@@ -24,4 +24,9 @@ console.log(`£${pounds}.${pence}`);
 // Try and describe the purpose / rationale behind each step
 
 // To begin, we can start with
-// 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 1. const penceString = "399p": initialises a string variable with the value "399p" 
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): removes the trailing "p" from the string, resulting in "399"
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): pads the string with leading zeros to ensure it has at least 3 characters, resulting in "399"
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): extracts the pounds part of the string by taking all characters except the last two, resulting in "3"
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): extracts the pence part of the string by taking the last two characters and pads it with trailing zeros if necessary, resulting in "99"
+// 6. console.log(`£${pounds}.${pence}`): outputs the final formatted price in pounds and pence, resulting in "£3.99"