London | 26-ITP-Jan | Oussama Mouggal | Sprint 1 | Coursework

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

@@ -2,5 +2,6 @@ let count = 0;
 
 count = count + 1;
 
+Line 3 is an assignment statement that updates the value of the count variable. 
 // 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

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

@@ -5,7 +5,8 @@ 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 = `${firstName.charAt(0)}${middleName.charAt(0)}${lastName.charAt(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 +17,10 @@ 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);
+
+console.log(`The dir part of ${filePath} is ${dir}`);
+console.log(`The ext part of ${filePath} is ${ext}`);
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -2,8 +2,7 @@ const minimum = 1;
 const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
+console.log(num)
+
+//In this exercise num is a variable that stores a random integer between 1 and 100.
 
-// In this exercise, you will need to work out what num represents?
-// 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

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

@@ -1,2 +1,3 @@
-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?
+// I commented out the comments.

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;
-age = age + 1;
+Newage = (age + 1);
+console.log(Newage)

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 ?
 
+let cityOfBirth = "Bolton";
 console.log(`I was born in ${cityOfBirth}`);
-const cityOfBirth = "Bolton";
+//The error was because the variable was declared after the consol.log

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

@@ -1,5 +1,8 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = String(cardNumber).slice(-4);
+//I think it won't work because slice is not used for numbers, it's used for strings and arrays. 
+console.log(last4Digits);
+// It gives an error because cardNumber is a number and slice is a method for strings and arrays. 
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working

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

@@ -1,2 +1,3 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const TwelveHourClockTime = "20:53";
+const TwentyfourHourClockTime = "08:53";
+//The errors in the code were that variables can't start with numbers.

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

@@ -2,13 +2,21 @@ 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;
 
 console.log(`The percentage change is ${percentageChange}`);
 
+//a) There are 4 function calls in this file. They are on lines 1, 2, 4, and 5.
+//b) The error is in line 4 and 5. The error is occurring because the replaceAll function is being called on a string, 
+// but the string has not been converted to a number.
+//c) The variable reassignment statements are in lines 4 and 5
+//d) The variable declarations are in lines 1,2,7, and 8.
+//e) The expression Number(carPrice.replaceAll(",","")) is converting the string carPrice into a number
+// by removing the commas and then converting the resulting string into a number. from "10,000" to "10000" to 10000
+
 // 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

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

@@ -9,6 +9,18 @@ const totalHours = (totalMinutes - remainingMinutes) / 60;
 const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
 console.log(result);
 
+//Answers:
+//a) There are 6 variable declarations in this program. They are on lines 1,3,4,6,7, and 9.
+//b) There is 1 function call in this program. It is on line 9.
+//c) The expression movieLength % 60 represents the remainder when movieLength is divided by 60.
+//d) The expression convert the total movie length into minutes, ignoring the leftover seconds.
+//e) The variable result represents the total length of the movie in hours, minutes, and seconds. 
+// a better name is movieLength 
+//f) This code work perfectly for positive numbers> However, it doesn't work for negative or very large numbers, and decimals.
+
+
+
+
 // 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?

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

@@ -1,21 +1,25 @@
 const penceString = "399p";
-
+// it creates a string representing a price in pence,the p at the end indicates the unit.
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
-
+// it removes the trailing "p" from the penceString, leaving only the numeric part of the string.
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//Insure the numeric string has at least 3 characters, padding it with 0 if needed.
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
-
+// Takes all digits except the last two to represent the pounds part of the price.
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
-
+// Takes the last two digits to represent the pence part of the price, ensuring it has two characters.
 console.log(`£${pounds}.${pence}`);
+// it logs the final price in pounds and pence format : "£3.99"
+
+
 
 // This program takes a string representing a price in pence
 // The program then builds up a string representing the price in pounds

Sprint-1/4-stretch-explore/chrome.md

@@ -11,8 +11,12 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+Calling the alert function displays a modal dialog box (popup window) in the browser with your message and an "OK" button. 
 
 Now try invoking the function `prompt` with a string input of `"What is your name?"` - store the return value of your call to `prompt` in an variable called `myName`.
 
 What effect does calling the `prompt` function have?
+It displays  a modal dialog box with a message (what's your name?),where user can type, and chose either ok or cancel.
+
 What is the return value of `prompt`?
+The return value of prompt is a string containing the text that the user typed when they click ok.Otherwise, it's null.

Sprint-1/4-stretch-explore/objects.md

@@ -13,4 +13,7 @@ Try also entering `typeof console`
 Answer the following questions:
 
 What does `console` store?
+a console stores an object provided by the browser that contains methods for logging information, debugging, and interacting with the developer console.
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+The syntax console.log accesses a property called log on the console object. On the other hand, console.assert means access the assert method of the console object. Finally, the '.' is the member access operator.