London | 25-ITP-Sep | Payman Issa Baiglu | Sprint 1 | Coursework/sprint 1

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

@@ -4,3 +4,4 @@ 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 take the count and add 1 to that so as the count was 0 line 3 make it 1.

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

@@ -4,8 +4,9 @@ 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 = firstName.charAt(0) + middleName.charAt(0) + lastName.charAt(0);
 
-let initials = ``;
+ 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 +17,11 @@ 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 + 1);
 
+const lastSlDotIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastSlDotIndex);
+
+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

@@ -7,3 +7,12 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // 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
+
+console.log(num);
+
+// this will make a random number between 1-100. Math.random will give us a number between 0-1 (both ends included). 
+// (maximum - minimum + 1): this is equal to 100-1+1=100 in this example.
+// (Math.random() * (maximum - minimum + 1)): this will multiply the random number which is between 0-1 by 100 so we have a number. 
+// Math.floor: this will round the number to the nearest lower whole number.
+// + minimum: will add 1 (the defined minimum) to the number so it never be below 1.
+// so we end up with a random number between 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?
+// 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 need to add double "//" at the start of the line so computer will ignore this line.

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

@@ -1,4 +1,6 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+// const age = 33;  age should be defined as let so it can get different values.
+let age = 33
 age = age + 1;
+console.log(age);

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

@@ -1,5 +1,7 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
+// any variable must be defined first and then can be used.
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+// const cityOfBirth = "Bolton"; => Wrong place!

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

@@ -1,9 +1,17 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+
+const last4Digits = cardNumber.toString().slice(-4);
 
 // 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
+
+
+
+//.Slice() is for strings but here we have 1 number here. so we need to make that number a string by putting it in a "". or using .toString() to change any input to string type.
+
+
+console.log(last4Digits);

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

@@ -1,2 +1,7 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+//const 12HourClockTime = "20:53";
+//const 24hourClockTime = "08:53";
+
+// An identifier or keyword cannot immediately follow a numeric literal.
+
+const ClockTime24Hour = "20:53";
+const ClockTime12hour = "08:53";

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

@@ -11,12 +11,34 @@ 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
+// a) How many function calls are there in this file? Write down all the lines where a function call is made 
+
+// lines 4,5,7,8
+// the following 4 lines are functions as they are manipulating the data.
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ,""));
+//const priceDifference = carPrice - priceAfterOneYear;
+//const percentageChange = (priceDifference / carPrice) * 100;
 
 // 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
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," "")); the error is a missing comma between the two arguments in the .replaceAll() function call. Without the comma,
+// the two string arguments "," and "" are not separated, so the computer reads them together as one argument.
+
 // c) Identify all the lines that are variable reassignment statements
 
+// lines 4,5
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+
+
 // d) Identify all the lines that are variable declarations
 
+// lines 1,2,7,8
+
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// It replace the "," with "" which means omitting the "," and add nothing so we have whole number form that computer can work with it.

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

@@ -13,13 +13,26 @@ console.log(result);
 
 // a) How many variable declarations are there in this program?
 
+6
+
 // b) How many function calls are there?
 
+// 1 : console.log(result);
+
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
+// % is the remainder. that line of code divides the total seconds number by 60 and gives us the remaining seconds.
+
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
 
+// in this line, totalMinutes of the move calculated. the remainder will be deducted and the rest of the second divided by 60 gives us the total minutes number.
+
+
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 
+// it represents the move length in hour, minutes and seconds. and it would be better understood as duration.
+
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+
+// yes as long as it receives the total seconds as a whole number it works fine.

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

@@ -1,20 +1,9 @@
 const penceString = "399p";
-
-const penceStringWithoutTrailingP = penceString.substring(
-  0,
-  penceString.length - 1
-);
-
+const penceStringWithoutTrailingP = penceString.substring( 0, penceString.length - 1);
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
-const pounds = paddedPenceNumberString.substring(
-  0,
-  paddedPenceNumberString.length - 2
-);
-
-const pence = paddedPenceNumberString
-  .substring(paddedPenceNumberString.length - 2)
-  .padEnd(2, "0");
-
+const pounds = paddedPenceNumberString.substring( 0 , paddedPenceNumberString.length - 2);
+const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2)
+.padEnd(2, "0");
 console.log(`£${pounds}.${pence}`);
 
 // This program takes a string representing a price in pence
@@ -25,3 +14,13 @@ 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): creates a new string with the last character removed by taking a substring from index 0 up to 
+//    penceString.length - 1, it removes the trailing "p" so we are left with the numeric pence portion as a string.
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): ensures the numeric string has at least 3 characters by adding leading zeros if required. 
+//    padStart(3, "0") will left-pad with "0" until the length is at least 3, so the code expects to split the string into ...pounds and last two digits = pence. 
+//    By guaranteeing at least 3 characters, the substring operations that follow always have at least one digit for pounds and two for pence.
+// 4. const pounds = paddedPenceNumberString.substring( 0 , paddedPenceNumberString.length - 2): takes the substring from the start up to the character two from the end. 
+//    That is, everything except the last two characters. as the last two characters represent pence; everything before that is pounds. Splitting this way converts a string of 
+//    pure pence into pounds and pence parts.
+// 5. substring(paddedPenceNumberString.length - 2): takes the last two characters (the pence portion).
+// 6. .padEnd(2, "0"): would add trailing zeros to make sure the pence string is at least 2 characters long.

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?
+"Hello world!" will be printed in a pop up box.
 
 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?
+A pop up window with the question and a place to input answer is opening. 
 What is the return value of `prompt`?
+The input value will be returned by prompt() and stored in the variable myName.

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

@@ -1,16 +1,22 @@
 ## Objects
 
-In this activity, we'll explore some additional concepts that you'll encounter in more depth later on in the course.
+//In this activity, we'll explore some additional concepts that you'll encounter in more depth later on in the course.
 
-Open the Chrome devtools Console, type in `console.log` and then hit enter
+//Open the Chrome devtools Console, type in `console.log` and then hit enter
 
-What output do you get?
+// What output do you get?
+// ƒ (){for(var o=arguments.length,u=new Array(o),l=0;l<o;l++)u[l]=arguments[l];if(e.apply(n,u),!("assert"===r&&u[0]||a)){a=!0;try{var 
+// d=Di.parse(new Error).map((t=>t.toString())).splice(1),c=("assert"===…
 
-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: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
 
-Try also entering `typeof console`
+//Try also entering `typeof console`
+//Answer the following questions:
+//What does `console` store?
+//The console in JavaScript doesn’t store the program’s variables or data — instead, it’s an object provided by the browser (or Node.js) that contains a set of methods for 
+//logging information, debugging, and interacting with the JavaScript environment.
 
-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 the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+//In both cases, console is an object, and log or assert are properties (specifically, methods) of that object. The dot (.) is called the dot notation operator or member 
+//access operator. It is used in JavaScript (and many other languages) to access a property or method that belongs to an object.