Sheffield | 26-Jan-ITP | Ebrahim Moqbel | Sprint 2 \ coursework|sprint-2

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

@@ -4,3 +4,5 @@ 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 an assignment where = is an assignment operator and in there we are adding value of 1 to the count variable

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

@@ -6,6 +6,6 @@ let lastName = "Johnson";
 // 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 = ``;
+console.log(`the initials is ${firstName.charAt(0)}, ${middleName.charAt(0), lastName.charAt(0)}`);
 
-// https://www.google.com/search?q=get+first+character+of+string+mdn
-
+// https://www.google.com/search?q=get+first+character+of+string+mdn

Sprint-1/1-key-exercises/3-paths.js

@@ -15,9 +15,10 @@ const base = filePath.slice(lastSlashIndex + 1);
 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
+// 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
+
+// https://www.google.com/search?q=slice+mdn 

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

@@ -7,3 +7,10 @@ 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
+
+// math.floor will make the number as a whole and remove any decimals or more likely to round the the nearest whole number
+// math.random will generate a random number from 0 to 1 but not 1 
+// (maximum - minimum + 1) provide a range of generated random number 
+// num is a random whole number between 1 and 100 
+
+console.log(num);

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 +1,4 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;

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 ?
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+//const cityOfBirth = "Bolton";
+
+// the error is that cityOfBirth varaible declared after the logging command

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

@@ -1,9 +1,12 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+//const last4Digits = cardNumber.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
+
+// I predicted the last four digits bit it has to be a string in order to use the method slice and that explain why it wasn't working
+const last4Digits = cardNumber.toString.slice(-4);

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twelveHourClockTime = "20:53";
+const twentyFourHourClockTime = "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 +12,27 @@ 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
+//1-carPrice.replaceAll(",", "") in line 4
+//3-number(...) in line 4 - enumerate the first result of replaceAll
+//2-priceAfterOneYear.replaceAll("," ,"")) in line 5
+//4-number(...) in line 5 - enumerate the second result of replaceAll
+//5-console.log(..) - line 9
+
 
 // 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?
+// the error is : a syntax error coming from the missing comma in line 5 between the arguments 
+
+
 
 // c) Identify all the lines that are variable reassignment statements
+// const priceDifference = carPrice - priceAfterOneYear;  Line 7
+// const percentageChange = (priceDifference / carPrice) * 100;  Line 8
 
 // d) Identify all the lines that are variable declarations
+// carPrice = Number(carPrice.replaceAll(",", ""));  Line 4
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));  Line 5
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// the number function convert the enumerate a string to a number and the method replaceAll replace ever comma with a space
+// the purpose is to clean the value so that it can be converted to a proper number using Number().
+

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

@@ -1,4 +1,5 @@
-const movieLength = 8784; // length of movie in seconds
+
+const movieLength = -8789; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +13,29 @@ 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 are 5 variable declarations
 
 // b) How many function calls are there?
+// There are 4 function calls  in line 9 and 10
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// % is a modulo operator that return the remainder of a multiplied number 
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// movieLength subtract the left over seconds from the total seconds(movieLength) to get a number that is divisible by 60
+// when dividing by 60 would convert the remaining seconds into whole minutes which ensures there is no decimal in totalMinutes
+
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// results present length of movie formatted as Hours:Minutes:Seconds and a better name could be movieDuration
+
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+
+// whole positive value: for the 8789 seconds the formatted duration would be fine 2:26:29 and the code would be working as expected 
+// under 60 seconds: 59 seconds would assign the hours and minutes both as 0s resulting 0:0:59 instead of the normal formatted way 00:00:59 but still correct 
+// zero value: the formatted duration would also be correct 0:0:0 even though it is an unusual value it still show that it can handle it 
+// Negative value: for the -8789 seconds would give us an output of -2:-26:-29 which is not a valid format and doesn't make any sense
+// the logic breaks where we need to give the user a message to enter a valid number 
+// 

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

@@ -23,5 +23,23 @@ 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
 
+
 // 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); reassigned a new value 
+// using the method substring starting form the index 0 ="3" and ending with -1 exclusively meaning doesn't include 'p' 
+// resulting with a numeric part of the price which is '399'
+
+//3.const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+// ensure the number in a 3 digits format by adding zeros minding the consistency of the formatting.
+
+//4.const pounds = paddedPenceNumberString.substring(0,paddedPenceNumberString.length - 2);
+//extracts everything except the last two number to form the pound portion of the price
+
+//5.const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+//extracts the last two digits to form the pence portion of the price and the padEnd method ensure the number in a two digits format consistent 
+
+//6.console.log(`£${pounds}.${pence}`);
+//Combines everything into the final formatted price string. Result: £3.99
+//basically the program will take the string "399p" and print out a string of "£3.99"

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

@@ -11,8 +11,11 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+It shows a message on the middle top of the page with a sting "Hello world!"
 
 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`?
+It shows a pop up box message with the sting "What is your name?" as an input in the middle top of the page 
+What is the return value of `prompt`? 
+it returns the text the user enters or an empty string if enter nothing in case cancel would return null

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

@@ -5,12 +5,16 @@ 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?
+log() { [native code] }
 
 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`
 
 Answer the following questions:
 
 What does `console` store?
+The console stores the history of messages your code prints while it runs
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+"." is called a dot notation where we can get access sth that belong to an object and the syntax means that we are accessing the methods that belong to the object console.

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

@@ -1,13 +1,29 @@
 // Predict and explain first...
 //  =============> write your prediction here
+//function capitalize will capitalise the first letter with index 0 
+// and will append the sliced string from index 1 which is the second letter
 
 // call the function capitalise with a string input
+
 // interpret the error message and figure out why an error is occurring
+//syntax Error :identifier the variabel has already been declared. 
+// As we can see the str variable has already been declared in the prameter of the function instead we just return the value 
+// The Error message is 
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
+// function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   console.log(str);
+//   return str;
+// }
+
+
+// =============> write your explanation here 
 
-// =============> write your explanation here
 // =============> write your new code here
+
+function capitalise(str) {
+return `${str[0].toUpperCase()}${str.slice(1)}`;
+
+}
+capitalise("ebrahim");
+capitalise('salomi');

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

@@ -1,20 +1,35 @@
 // Predict and explain first...
 
+
 // Why will an error occur when this program runs?
 // =============> write your prediction here
 
+//1- The function is trying to declare the decimalNumber twice in the perameter and later as a new variable 
+//2-console.log() is printing a variable in the local scope where it can't be accessed as it is inside the function 
+
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
+
+//   return percentage;
+// }
 
-  return percentage;
-}
 
-console.log(decimalNumber);
 
-// =============> write your explanation here
 
+// =============> write your explanation here
+//similar to the previous exercise where the variable decimal Number has already been declared in the parameter 
+// and already is a local variable which can't be declared again  
+//As the decimalNumber inside the function we can't print it using the console.log() as it has no power to the local scope
+//instead we can delete the second declaration and just leave the parameter as an input for the user which would be nicely work
 // Finally, correct the code to fix the problem
+
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+return percentage;
+}
+
+console.log(convertToPercentage(0.5));

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

@@ -4,16 +4,22 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+//The error might be accuring because the parameter can't be a number and should be a variable 
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
 // =============> write the error message here
+//the Error is a syntax error: Unexpected number 
 
 // =============> explain this error message here
+// we can put a number or any argument when we call the number not when we shape it 
 
 // Finally, correct the code to fix the problem
+function square(num) {
+    return num * num;
+ }
 
 // =============> write your new code here
 

Sprint-2/2-mandatory-debug/0.js

@@ -1,14 +1,23 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// This function would multiply the two arguments a and b whatever that is
+// when we log the output we will get the string and the output of the function but because we are not returning an output we might run into an error 
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+// function multiply(a, b) {
+//   console.log(a * b);
+// }
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+// console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
+//The console.log() inside the funtion will print a*b but when we call the function will return() undefined means will return nothing)for the two variables a and b
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a, b) {
+  return a * b;
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+

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

@@ -1,13 +1,21 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// The function suppose to return the sum of the two variables but we will encounter an error probably a syntax Error
 
-function sum(a, b) {
-  return;
-  a + b;
-}
-
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
+// function sum(a, b) {
+//   return;
+//   a + b;
+// }
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+// As we return nothing by closing the line with a semicolon hence a + b is not returned where we tell the computer to exit and go back to global scope and the computer will not be able to read the lines after that
 // =============> write your explanation here
+
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function sum(a, b) {
+  return a + b;
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);