Sheffield | 26-Jan-ITP | Karim Mhamdi | Sprint 1 | Coursework/sprint-1

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

@@ -2,5 +2,10 @@ let count = 0;
 
 count = count + 1;
 
+console.log(count);
+
 // 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 increments the value of the count variable by 1.
+// The = operator assigns the result of (count + 1) back to count.

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

@@ -5,7 +5,12 @@ 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 +17,9 @@ 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("."))       ;
 
-// https://www.google.com/search?q=slice+mdn
+console.log("dir:", dir);
+console.log("ext:", ext);
+// https://www.google.com/search?q=slice+mdns

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

@@ -3,7 +3,16 @@ const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
+console.log(num);
+
 // In this exercise, you will need to work out what num represents?
+// num represents a random whole number between the minimum and maximum values.
+
 // 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
+
+// Step 1: Math.random() returns a decimal in [0, 1) (includes 0, excludes 1)
+// Step 2: Multiply by 100 -> value is in [0, 100)
+// Step 3: Math.floor(...) converts it to an integer in [0, 99]
+// Step 4: Add 1 -> integer in [1, 100]

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

@@ -1,2 +1,4 @@
+/*
 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?
+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 +1,8 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
-// what's the error ?
+// what's the error ? The error was cannot acess 'cityofBirth' before initialization.
+// This happpend becouse CityofBirth was declared with a const but was used before its decleration.
+
+const cityofBirth = "Bolton";
+console.log(`I was born in ${cityofBirth}`);
+
 
-console.log(`I was born in ${cityOfBirth}`);
-const cityOfBirth = "Bolton";

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

@@ -1,9 +1,18 @@
 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
+
+/*
+Prediction: It wont work because cardNumber is a number and slice() only works on strings.
+Error: TypeError - cardnumber.slice is not a function. 
+Explanation: Numbers dont have the slice method.
+*/

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const hour12HourClockTime = "20:53";
+const hour24HourClockTime = "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 +12,22 @@ 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
+// Line 4 has a function call
+// Line 5 has a function call
+// line 10 has a function call
 
 // 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?
+// I have spotted the error on line 5 there was a missing coma between the two arguments of replaceAll() specifically between "," and "".
 
 // c) Identify all the lines that are variable reassignment statements
+// Line 4 and line 5 are variable reassignment statements.
 
 // d) Identify all the lines that are variable declarations
+// Line 1
+// Line 2
+// line 7
+// line 8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// replaceAll() removes commas and Number() converts the cleaned string into a number.
+

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

@@ -12,14 +12,24 @@ 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 is 6 Variable declarations
+// Line 1 , Line 3 , Line 4 , Line 6 , Line 7 , Line 9
 
 // b) How many function calls are there?
+// There is 1 function call in Line 10
 
 // 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 represents the remainder of the division of movieLength by 60.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// Line 4 removes the leftover seconds, then devides by 60.
+// then divides the result by 60 to calculate the total full minutes.
 
-// e) What do you think the variable result represents? Can you think of a better name for this variable?
+ // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// Result is a formatted time string in hours, minutes and seconds. A better name for this varible could be formattedTime.
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// I tested diffrent positive numbers and the code work correctly.
+// However it well work properly for positive numbers.
+// If movielength is negative or a decimal number , the output may not repeesent the time correctly.

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

@@ -22,6 +22,13 @@ console.log(`£${pounds}.${pence}`);
 
 // You need to do a step-by-step breakdown of each line in this program
 // Try and describe the purpose / rationale behind each step
+// 1. Stores "399p" as a string
+// 2. removes the "p" at the end 
+// 3.  adds zeros at the start if needed to make it 3 digits.
+// 4. Takes everything except the last 2 digits as pounds.
+// 5. Prints the result in this format: £3.99
 
-// To begin, we can start with
+// I also tested it by changing 399p to 50p and the result was £0.50 thats shows diffrent numbers well have diffrent outputs
+
+// To begin, we can start wit
 // 1. const penceString = "399p": initialises a string variable with the value "399p"

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

@@ -10,9 +10,10 @@ Let's try an example.
 In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
-What effect does calling the `alert` function have?
+What effect does calling the `alert` function have? It displays a popup message box with a text saying Hello world! and pauses the website in until you click ok to unpause it.
 
 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?
-What is the return value of `prompt`?
+What effect does calling the `prompt` function have? The prompt function displays a popup box asking you to enter a text and pausing the page until you click ok or cancel.
+
+What is the return value of `prompt`? Prompt returrns the text enterend by the user as a string if the user clicks OK, and returns null if the user clicks cancel.

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

@@ -12,5 +12,8 @@ Try also entering `typeof console`
 
 Answer the following questions:
 
-What does `console` store?
-What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+What does `console` store? Console is an object that stores debugging finctions.
+
+What does the syntax `console.log` or `console.assert` mean? Console.log or console.assert means accesing a fuction inside the console object.
+
+ In particular, what does the `.` mean? The dot '.' is called dot notation and it used to access properties or methods of an object.