Manchester | 26-ITP-Sep | Khalidbih | Sprint 1| Coursework Sprint-1

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

@@ -4,3 +4,6 @@ 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 updates the variable count, It takes the value on the right (count + 1, which is 0 + 1 = 1),
+// and stores it back into `count` using the = assignment operator.
+

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

@@ -5,7 +5,10 @@ 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.
 
-let initials = ``;
+let initials = (firstName[0] + middleName[0] + lastName[0]);
+console.log (initials);
+
+
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

Sprint-1/1-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("."));
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -4,6 +4,10 @@ const maximum = 100;
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
 // In this exercise, you will need to work out what num represents?
+// num is a randomly generated whole number in the interval [1, 100], meaning it can be any number from 1 to 100. It is created by generating a random decimal,
+// rounding it down, and shifting it to start at 1.
 // 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
+// When I ran the program several times, num always produced a different whole number between 1 and 100,
+// This shows that the program generates a new random number each time it runs.

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

@@ -1,4 +1,5 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+console.log(age)

Sprint-1/2-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}`);
+// The error happens because cityOfBirth is used before it is declared,
+// Variables declared with const cannot be accessed before their declaration.
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

Sprint-1/2-mandatory-errors/3.js

@@ -1,9 +1,13 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits);
+console.log(cardNumber.toString().slice(-4));
 
 // 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 won’t work because cardNumber is a number, and .slice() only works on strings or arrays.
 // 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
+// Convert cardNumber to a string first, then use .slice(-4) to get the last 4 digits

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,2 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const time24h = "20:53";
+const time12h = "08:53";

Sprint-1/3-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 +12,16 @@ 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
+// 5 functions, lines are 4-5-10.
 
 // 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 coming from line 5, because there wasn't a comma between argument in replaceAll(",", "")).
 
 // c) Identify all the lines that are variable reassignment statements
+// the lines that variable reassignment statements are 4 and 5.
 
 // d) Identify all the lines that are variable declarations
+// The variable declaration lines are 1-2-7-8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// Converts the string "10,000" into the number 10000 by removing commas so math can be done.

Sprint-1/3-mandatory-interpret/2-time-format.js

@@ -12,14 +12,20 @@ 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 6 declarations lines 1-3-4-6-7 and 9.
 
 // b) How many function calls are there?
+// 1 function call.
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// it gives the number of seconds left after counting all full minutes.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// the total number of complete minutes in the movie.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// represents the hours,minutes,seconds of the movie.better name for the variable can be (movieTime).
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// The code won’t work for all values of movieLength. If it’s negative, the result doesn’t make sense because time cannot be negative.

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -25,3 +25,9 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. line (3) it returns a substring from the given string, it takes penceString and returns the substring that start with index 0 ends one character before the end we have 399p it returns 399.
+// 3. line (8) We now have the string "399", which has 3 characters. This ensures we can split it into pounds and pence correctly.
+// 4. line (9) We have a start and an end index. We start at 0 and end two characters before the string’s end, because the last two characters represent the pence. This gives us the pounds part.   
+// 5. line (14) This takes the last two characters of the string, which represent the pence portion of the price.it also Extracts the pence digits safely and makes sure it’s always two digits, even if the original number was small.
+// 6. line (18) This prints the final price to the console in pounds and pence, using the pounds and pence variables to show it like £3.99.
+