West Midlands | ITP-Sept-25 | Mustaf Asani | Sprint 1 | coursework/sprint-1

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

@@ -1,6 +1,6 @@
 let count = 0;
 
-count = count + 1;
+count = count + 1; //line  3 is calculating the result of adding the current count value to 1 and assigning that to 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

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 = `${firstName[0]}${middleName[0]}${lastName[0]}`;
 
-// https://www.google.com/search?q=get+first+character+of+string+mdn
+console.log(initials); //testing my string
 
+// 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 = base.slice(base.lastIndexOf(".") + 1);
 
-// https://www.google.com/search?q=slice+mdn
+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

@@ -3,6 +3,13 @@ const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
+//math.random() generates a random decimal number between 0 (inclusive) and 1 (exclusive). which we multiply by 100.
+//we round the above number to the largest interger less than or equal to the given outcome.
+//we add the value of minimum to the result.
+//num gives us a random number between 1 and 100.
+
+console.log(num);
+
 // 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

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; //we need to change const to let
 age = age + 1;
+console.log(age);

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

@@ -1,5 +1,5 @@
 // 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}`); //console.logmust come after variable declaration.

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

@@ -1,5 +1,11 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().slice(-4);
+
+// Prediction: the second vairable assignemment will give an error because the slice method canno be used on a number. we will get a type error
+
+//when i ran the code a got an error saying cardNumber.slice is not a function. this is because the slice method only works on strings and arrays whilst cardNumber is a number.
+
+console.log(last4Digits);
 
 // 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 +1,4 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const HourClockTime12 = "20:53"; //variable name cannot start with a number.
+const hourClockTime24 = "08:53";
+
+console.log(`12 hr clock ${HourClockTime12}, 24 hr clock ${hourClockTime24}`);

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 +12,12 @@ 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, line 4 has 2 function calls Number() and replaceAll(), line 5 has 2 function calls Number() and replaceAll(), line 10 has a log() 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?
+// 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? line 5 there was a missing comma separating the two arguments for the replaceAll function.
 
-// c) Identify all the lines that are variable reassignment statements
+// c) Identify all the lines that are variable reassignment statements lines 4 and 5.
 
-// d) Identify all the lines that are variable declarations
+// d) Identify all the lines that are variable declarations. lines 1,2,7 and 8
 
-// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression? it is taking the carPrice variable and removing the comma from it then converting it to a number.

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

@@ -1,7 +1,7 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = -348769045688; // length of movie in seconds
 
-const remainingSeconds = movieLength % 60;
-const totalMinutes = (movieLength - remainingSeconds) / 60;
+const remainingSeconds = Math.abs(movieLength) % 60;
+const totalMinutes = (Math.abs(movieLength) - remainingSeconds) / 60;
 
 const remainingMinutes = totalMinutes % 60;
 const totalHours = (totalMinutes - remainingMinutes) / 60;
@@ -11,15 +11,17 @@ 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?
+// a) How many variable declarations are there in this program? there are 6 variable declarations
 
-// b) How many function calls are there?
+// b) How many function calls are there? 1 function call (console.log).
 
-// c) Using documentation, explain what the expression movieLength % 60 represents
+// c) Using documentation, explain what the expression movieLength % 60 represents it returns the remainder from dividing movieLength by 60.
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
-// d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// d) Interpret line 4, what does the expression assigned to totalMinutes mean? it gives us the total whole minutes we have left after removing the remaining seconds from movieLength and dividing by 60.
 
-// 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? it represents the total time of the movie in hours, minutes and seconds.
+// Can you think of a better name for this variable? movieLengthFormat
 
-// f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? I think it will work for all positive value of movieLength.
+//  Explain your answer this is because the code is calculating the time format based on seconds, minutes and hours which are all positive values.

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

@@ -25,3 +25,8 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): takes of the p at the end of the string.
+// 3.const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): creates a paddded pencestring value so that if the value has less than 3 digits it gets padded with 0s at the start to make it 3 digits.
+// 4. const pounds = paddedPenceNumberString.substring(0,paddedPenceNumberString.length - 2): creates a variable that holds the pound value of the string by removing the last 2 digits of the padded pence string.
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): creates a variable that holds the pence value of the string by taking the last 2 digits of the padded pence string and if there is only one digit it pads it with a 0 at the end to make it 2 digits.
+// 6. console.log(`£${pounds}.${pence}`): prints out the final value in pounds and pence format.

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

@@ -10,9 +10,9 @@ 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 shows a pop up box with the text input that was added in brackects on calling alert.
 
 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? it shows a pop up box with the message that was written when the function was called, it prompts the user to respond.
+What is the return value of `prompt`? it returns a string.

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

@@ -4,13 +4,13 @@ In this activity, we'll explore some additional concepts that you'll encounter i
 
 Open the Chrome devtools Console, type in `console.log` and then hit enter
 
-What output do you get?
+What output do you get? i get the function log with an example of how it looks
 
-Now enter just `console` in the Console, what output do you get back?
+Now enter just `console` in the Console, what output do you get back? i get an object console with a list of all the functions that it has.
 
 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? it stores functions that operate on the console.
+What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean? console.log is a dot notation way of accessing properties of objects and in this case the properties functions. in this case console.log means the log function from the console object.