London | 26-ITP-Sep| Mandip Sanger | Sprint 2 | Coursework

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

@@ -4,3 +4,4 @@ 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 is adding plus 1 to  the original value of count for example if count is 2 line 3 result will be 2+1=3, and store it back to count

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

@@ -1,10 +1,12 @@
-const firstName = "Creola";
-const middleName = "Katherine";
-const lastName = "Johnson";
+let firstName = "Creola";
+let middleName = "Katherine";
+let 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 = ``;
+let initials = `${firstName[0]}${middleName[0]}${lastName[0]}`;
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
+console.log(initials);
+//remove const

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

@@ -17,7 +17,10 @@ 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 = filePath.slice(filePath.lastIndexOf(".") + 1);
 
-// https://www.google.com/search?q=slice+mdn
+console.log(dir);
+console.log(ext);
+
+// https://www.google.com/search?q=slice+mdn

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

@@ -7,3 +7,8 @@ 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 and maximum values (inclusive).
+// The expression Math.random() generates a random decimal number between 0 (inclusive) and 1 (exclusive).
+// By multiplying this value by (maximum - minimum + 1), we scale it to the desired range.
+// The Math.floor() function then rounds this value down to the nearest whole number, ensuring we get an integer.
+// Finally, we add the minimum value to shift the range to start from the minimum instead of 0.

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

@@ -1,4 +1,7 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+// const age = 33;
+// age = age + 1;
+
+let age = 33;
 age = age + 1;

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

@@ -1,5 +1,10 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
+const cityOfBirth = "Bolton";
 
 console.log(`I was born in ${cityOfBirth}`);
-const cityOfBirth = "Bolton";
+
+// return has not been defined before it is used in the console.log statement.
+// To fix this, you should declare and assign a value to the variable cityOfBirth before using it in the console.log statement.
+// To do this, you can move the line const cityOfBirth = "Bolton"; above the console.log statement.
+// This way, the variable will be defined before it is used, and the code will work as expected.

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

@@ -1,9 +1,12 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().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
 // 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?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+// returns an error because the slice method is not available for numbers. The slice method is a string method, and cardNumber is a number.
+// To fix this, we need to convert cardNumber to a string before using the slice method. We can do this by using the toString() method or by using template literals.

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

@@ -1,2 +1,9 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+const twentyFourHourClockTime = "20:53";
+
+// 12 Hour clock time is a string that represents the time in 12-hour format, while 24hourClockTime is a string that represents the time in 24-hour format.
+// To convert 12HourClockTime to 24-hour format, we can use the following steps:
+// 1. Split the string into hours and minutes using the split() method.
+// 2. Check if the time is in the "pm" period. If it is, add 12 to the hours (unless it's 12pm).
+// 3. If the time is in the "am" period and the hour is 12, set the hour to 0.
+// 4. Format the hours and minutes into a string in 24-hour format.

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

@@ -12,11 +12,37 @@ 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 5 function calls 
+//carPrice.replaceAll(",", "")
+//Number(carPrice.replaceAll(",", ""))
+//priceAfterOneYear.replaceAll(",", "")
+//Number(priceAfterOneYear.replaceAll(",", ""))
+//console.log(`The percentage change is ${percentageChange}`)
 
 // 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?
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
 
 // c) Identify all the lines that are variable reassignment statements
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," "")); missing a comma between the two arguments of replaceAll()
+
 
 // d) Identify all the lines that are variable declarations
+// let carPrice = "10,000";
+//let priceAfterOneYear = "8,543";
+//const priceDifference = carPrice - priceAfterOneYear;
+//const percentageChange = (priceDifference / carPrice) * 100;
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//carPrice.replaceAll(",", ""), "10,000" and removes the comma:"10000"
+//Number("10000") converts the string "10000" into the number:10000
+//So the whole expression:Number(carPrice.replaceAll(",", ""))converts "10,000"
+//from a string containing a comma into the actual number 10000.
+//"10,000"
+  // ↓
+//remove ","
+  // ↓
+// //"10000"
+//    ↓
+// convert to Number
+//    ↓
+// 10000

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

@@ -23,3 +23,11 @@ console.log(result);
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+
+//There are 6 variables declared in this program: movieLength, remainingSeconds, totalMinutes, remainingMinutes, totalHours, and result.
+// There is 1 function calls in this program: console.log(), and the three arithmetic operations used to calculate remainingSeconds, totalMinutes, and remainingMinutes.
+// The expression movieLength % 60 calculates the remainder when movieLength is divided by 60. This gives the number of seconds remaining after converting the total length of the movie into minutes and hours.
+// Interpret line 4, the expression assigned to totalMinutes calculates the total number of minutes in the movie by subtracting the remaining seconds from the total length of the movie and dividing by 60.
+// The variable result represents the formatted string of the movie length in hours, minutes, and seconds. A better name for this variable could be formattedMovieLength or movieLengthString.
+// This code will work for all values of movieLength.
+// experimenting with different values of movieLength, such as 1:51:6, 0:55:33 etc., will show that the code correctly formats the length of the movie in hours, minutes, and seconds for all positive values.

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

@@ -2,13 +2,13 @@ const penceString = "399p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
-  penceString.length - 1
+  penceString.length - 1,
 );
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
 const pounds = paddedPenceNumberString.substring(
   0,
-  paddedPenceNumberString.length - 2
+  paddedPenceNumberString.length - 2,
 );
 
 const pence = paddedPenceNumberString
@@ -17,11 +17,17 @@ const pence = paddedPenceNumberString
 
 console.log(`£${pounds}.${pence}`);
 
-// This program takes a string representing a price in pence
+// This program takes a string representindng a price in pence
 // The program then builds up a string representing the price in pounds
 
 // You need to do a step-by-step breakdown of each line in this program
 // 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"
+// const penceString = "399p": initialises a string variable with the value "399p"
+// 1. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): creates a new string variable that removes the last character "p" from the original string
+// 2. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): creates a new string variable that pads the original string with leading zeros to make it 3 characters long
+// 3. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): extracts the pounds portion of the string by taking all characters except the last two
+// 4. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): extracts the pence portion of the string by taking the last two characters and pads it with trailing zeros to make it 2 characters long
+// 5. console.log(`£${pounds}.${pence}`): outputs the final formatted price in pounds and pence to the console