London | 26-ITP-May | Vito Moratti | Sprint 1 | Coursework

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

@@ -1,6 +1,7 @@
 let count = 0;
 
 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 is updating variable count by adding 1 to its value.
+

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

@@ -5,7 +5,9 @@ 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]}`; // using string indexing to get the first character of 
+// each string
+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 +16,12 @@ 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(lastSlashIndex - 9, lastSlashIndex);//dir variable gets to "dir part of
+//  the path by using last instance of "/" as a reference and counting backwards 9 digits to get the beginning of the path
+// and uses last instance of "/" as the end of the path, which is "interpret"
+const ext = filePath.slice(lastSlashIndex + 5);// ext variable gets the last instance of "/" as a reference and
+//  counts 5 indexes forward to get the "ext" part of the path which is ".txt"
+console.log(`The dir part of the filePath ${filePath} variable is "${dir}".`);
+console.log(`The ext part of the filePath ${filePath} variable is "${ext}".`);
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -2,8 +2,9 @@ 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
+// num is a random number multiplied by the maximum number(100) plus 1. It is then rounded down to the nearest whole number using Math.floor. This means that num will be a random integer between 1 and 100, inclusive.

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?
+// we comment it out, this way the computer doesn't read is as code.

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; // by changing the way we declare the variable from "const" to "let" we allow
+//  reassignment of the value of the variable
 age = age + 1;

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}`);
+// The error was that the variable is not defined before the the console.log command. 
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -1,9 +1,16 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.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
+//
+//     ------------------------Answer------------------------
+// Running the code did't meet my predictions. One, the most important thing I did't realize
+//  is that "slice() method only applies to strings and arrays,
+//  and the "cardNumber" variable  was a number. By converting it to a string, the slice method
+//  is working correctly now."

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

@@ -1,2 +1,3 @@
 const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const 24hourClockTime = "20:53"; 
+//what is the task in this exercise?

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

@@ -2,8 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
-
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));// coma was missing.
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
 
@@ -12,11 +11,19 @@ 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
-
+// Answer to a): There are 3 function calls in this file. 
+//
 // 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?
-
-// c) Identify all the lines that are variable reassignment statements
-
+// Answer to b): The error is coming from line 5, where coma is missing in "replaceAll()"" function.
+//
+ //c) Identify all the lines that are variable reassignment statements
+// Answer to c) Variables are reassigned on lines: 4 and 5
+//
 // d) Identify all the lines that are variable declarations
-
-// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// Answer to d) Variables are declared on lines: 1, 2, 6, 7
+//
+// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - 
+// what is the purpose of this expression?
+// Answer to e): The expression Number(carPrice.replaceAll(",","")) is replacing all the comas in the string in the variable
+//carPrice with an empty string and then turns it into number. 
+// The purpose of it is that number can now be used to perform mathematical operations.

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = -8784; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -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?
-
+// Answer to a) There are six variables in this program.
+//
 // b) How many function calls are there?
-
+// Answer to b) I think there one function call in this program and it is "console.log".
+//
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
-
+// Answer to c) The expression movieLength % 60 tels how many seconds will be left after
+//  full minutes are extracted.
+//
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+// Answer to d) The line four calculates how many full minutes are in the movie.
+//
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
-// f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Answer to e) The variable result represents the total length of the movie in hours, minutes and seconds.
+//  A better name for this variable could be "formattedMovieLength".
+//
+// f) Try experimenting with different values of movieLength. Will this code work for all values of
+//  movieLength?Explain your answer
+// Answer to f) This code will work with all values, however giving it a negative value will produce
+//  negative results.

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

@@ -1,11 +1,12 @@
-const penceString = "399p";
+const penceString = "33399p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
@@ -24,4 +25,21 @@ console.log(`£${pounds}.${pence}`);
 // Try and describe the purpose / rationale behind each step
 
 // To begin, we can start with
-// 1. const penceString = "399p": initialises a string variable with the value "399p"
+// Line 1. const penceString = "399p": initialises a string variable with the value "399p"
+//
+// Line 3. variable "penceStringWithoutTrailingP" declared and assigned first three characters
+// of "penceString" using the substring method, removing the trailing "p".
+//
+// Line 8 . variable "paddedPenceNumberString" declared and assigned the value of "penceStringWithoutTrailingP"
+// padded to a minimum length of 3 characters with leading zeros using the padStart method. Which is clever way,
+// really to replace it with zeros if number of pence is less than 3 characters long.
+//
+// Line 10 Variable "pounds" declared and assigned value of "paddedPenceNumberString" but without the last
+// two characters.
+//
+// Line 15. Variable "pence" declared and assigned value of the last two characters of "paddedPenceNumberString"
+// and padded to a minimum length of 2 characters with zeros at the end, padEnd method is used once again.
+// it is to ensure that if the number of pence is less than 2 characters long, it will be padded with zeros
+// at the end.
+//
+// Line 19. console.log is used to print final output.

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

@@ -11,8 +11,10 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+I Don't get it, When you say an input string "Hello World" do you meaan as a parameter, do you mean it suppose to return "Hello World", or what ?
 
 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`?
+Is it suppose to prompt me?

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

@@ -14,3 +14,6 @@ Answer the following questions:
 
 What does `console` store?
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+Answer: I don't think 'console' itself stores anything. Variables store values. 'console' is an object. 
+'.' after the 'console' allows to add one of the methods like console.log() or console.clear()