WEST-MIDLANDS-JAN-ITP|SEGUN FOLAYAN|STRUCTURING AND TESTING DATA|SPRINT1

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

@@ -1,6 +1,7 @@
 let count = 0;
 
-count = count + 1;
+count = count + 1; // Further note based on feedback =>  I can also describe this as 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 three adds 1 to the value of count and stores it as count

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

@@ -16,8 +16,16 @@ 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);
 
-// https://www.google.com/search?q=slice+mdn
+// Extract the file extension part
+const lastDotIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastDotIndex);
+
+console.log(`The directory part of ${filePath} is ${dir}`);
+console.log(`The extension part of ${filePath} is ${ext}`);
+
+// https://www.google.com/search?q=slice+mdn

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

@@ -2,8 +2,15 @@ const minimum = 1;
 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?
 // 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
+// Math.floor() method always rounds down and returns the largest integer less than or equal to a given number
+// Math.random() method returns a floating-point pseudo-random number in the range 0 to less than 1 
+// Further information based on review: 
+// what is the use of (maximum-minimum+1) at line 4 => This is to ensure that we get a range of value between maximum and minimum
+// what is the use of + minimum at line 4 => To make sure we do not get a number below the minimum
+// what is the possible range of value of num => num ranges from 1-100

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? I have added stroke to comment it out.

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 = 34;
 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}`);
+// what's the error ? const cityofBirth needs to be declared before it can be used.
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+

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

@@ -1,9 +1,11 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+//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?
+// Before running the code, make and explain a prediction about why the code won't work- This is because .slice is a string method.
+// Then run the code and see what error it gives-It says cardNumber.slice is not a function.
+// Consider: Why does it give this error? Is this what I predicted? If not, what's different? Like I mentioned .slice is string method.
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value

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

@@ -1,2 +1,7 @@
 const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const 24hourClockTime = "08:53"; // This should be correctly written as "08:53 PM" in the 24 hour format
+
+// Further information based on review:
+// line 1 should be written as const twelveHourClockTime = "20:53",
+// line 2 should be written as const twentyFourHourClockTime = "08:53"
+//

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

@@ -2,21 +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}`);
 
-// Read the code and then answer the questions below
+// 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
+// a) How many function calls are there in this file? Write down all the lines where a function call is made: Thete are 5 functions- 2 on line 4, 2 on line 5 and 1 on line 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?
+// 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, a comma is needed
 
-// c) Identify all the lines that are variable reassignment statements
+// c) Identify all the lines that are variable reassignment statements- line 4 and line 5
 
-// d) Identify all the lines that are variable declarations
+// d) Identify all the lines that are variable declarations: Line 1, Line 2, Line 7 and Line 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? This expression removed the comma in the number and convert the string into a number

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

@@ -1,4 +1,5 @@
 const movieLength = 8784; // length of movie in seconds
+//const movieLength = 100;
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -11,15 +12,21 @@ 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? 6
 
-// b) How many function calls are there?
+// b) How many function calls are there? 1
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
-// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators 
+// % is the module operator, which calculated the remainder of the division of movieLength by 60
+// Further information based on feedback: This expresss represents the seconds left over when all the full minutes of the movie has been subtracted from total time.
 
-// d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// d) Interpret line 4, what does the expression assigned to totalMinutes mean? Computes the the difference between movielength and remaining minutes. And divides this 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? Can you think of a better name for this variable? It gives the time of the movie in hours, minutes and seconds
+// Further Information based on feedback => variable counld be moviedurationHMS
 
-// 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? Explain your answer. It does work for all number inputs.
+// f) For example, movieLength of 100 gives 0:-1:-40 and movieLength of 8784 gives 2:26:24
+
+//Further information based on feedback: This is a mistake, it should be 0:1:40

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); Removes the p from the string. Result=399
+// 3  const paddedPenceNumberString=penceStringWithoutTrailingP.padStart(3,"0"):This ensures that the pence value has at least three  digits. It can add three leading zeros if necessary
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length-2); Extracts the pound part of rhe value.
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length-2).padEnd(2,"0"); Extracts the pence portion of the value
+// 6. Computes out the final number in pounds and pence.

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

@@ -8,11 +8,14 @@ Just like the Node REPL, you can input JavaScript code into the Console tab and
 Let's try an example.
 
 In the Chrome console,
-invoke the function `alert` with an input string of `"Hello world!"`;
+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? This prints Hello world to the console: The browser displays "Hello world!" in a pop up window   Correction: it displays "Hello world!" in a pop up window. Not to the console.
 
 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 displays a dialog box that allows the user to give an input
+What is the return value of `prompt`? It displays a dialog box. 
+Correction: prompt returns the string input typed in by the User. 
+If the user clicks okay, it returns the string typed in by the user.
+If the user clicks Cancel, the return value in null.

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

@@ -4,13 +4,16 @@ 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? f log(){[native code]}
 
-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? console {debug: f, error: f, info: f,f log:f warn f,....}
 
-Try also entering `typeof console`
+Try also entering `typeof console` This gives 'object'
 
 Answer the following questions:
 
-What does `console` store?
+What does `console` store? It is used for logging information. It has its own methods that help to log information. It also help to debuggi
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+console.log outputs a message to the console.
+If the assertion is false, it logs an error message to the console.
+