Manchester | 26-ITP-Sep | Mathew Shaibu | Sprint 2 | Course-work-2

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

@@ -1,6 +1,6 @@
 let count = 0;
 
 count = count + 1;
+console.log(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
+// Line 3 has been able to reassign the value of the count variable from 0 to 1. The operator = assign the new value to be stored as 1.

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

@@ -1,10 +1,7 @@
 const firstName = "Creola";
 const middleName = "Katherine";
 const lastName = "Johnson";
+const initials = `${firstName[0]}${middleName[0]}${lastName[0]}`;
 
-// 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.
+console.log(initials);
 
-const initials = ``;
-
-// https://www.google.com/search?q=get+first+character+of+string+mdn

Sprint-2/1-key-exercises/3-paths.js

@@ -17,7 +17,12 @@ 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(0, lastSlashIndex);
+console.log(`The dir part of ${filePath} is ${dir}`);
+
+const lastDotIndex = base.lastIndexOf(".");
+const ext = base.slice(lastDotIndex);
+console.log(`The ext part of ${filePath} is ${ext}`);
+
 
 // https://www.google.com/search?q=slice+mdn

Sprint-2/1-key-exercises/4-random.js

@@ -2,8 +2,11 @@ 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" variable carries the result/value of the expressions evaluated.
+// (maximum - minimum) workout the size of the range: 100 - 1 + 1 = 100
+// Math.random() gives a decimal from 0 up to just under 1 (0.9999999).
+// Math.floor() takes out all decimal and make them a whole number from 0 to 99.
+// + minimum shift 1 through 100 in the expression 

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

@@ -1,2 +1,5 @@
-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?
+
+
+// This error is a syntaxError because javaScript could not understand the text. The error can be solved by commenting the lines using ("//")

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

@@ -1,4 +1,8 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+console.log(age);
+
+// This code returns a "TypeError: Assignment to constant variable.", because the variable age has been made constant and can't be manipulated.
+// To solve the problem, we have to reassign the age variable from "const" to "let", that way it will allow for further manipulation and solve the error.

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

@@ -1,5 +1,9 @@
 // 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}`);
+
+
+// In this task, the variable was not assigned before attempting to print. Therefore, it gives the error "ReferenceError: Cannot access 'cityOfBirth' before initialization"
+// The solution would be to assign the variable "cityOfBirth" first before printing the code.

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

@@ -1,9 +1,8 @@
-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
+// The variable cardNumber is not a string and the slice() function works with strings or array
+
+// Consider: Why does it give this error? 
+// It gave that error "TypeError: cardNumber.slice is not a function" because the slice() function tool are not applicable to numbers.     

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

@@ -1,2 +1,6 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const time12Hours = "8:53pm";
+const time24Hours = "20:53";
+console.log(`${time12Hours}, ${time24Hours}`)
+
+//  The code displayed the error "SyntaxError: Invalid or unexpected token", this is because javaScript does not understand the variable name format.
+// This error is solved by renaming the variable name starting it with an alphabet and avoiding starting the variable with a number.

Sprint-2/3-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;
@@ -13,10 +13,23 @@ console.log(`The percentage change is ${percentageChange}`);
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
 
+// Answer: Line 4 has 2 function call :'Number(), replaceAll()'. 
+// Line 5 has 2 function call: 'Number(), replaceAll()'. 
+// Line 10 has 1 function call console.log() 
+// In total there are 5 function calls.
+
 // 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?
+// Answer: The error is coming from line 5, spotting at the Number(priceAfterOneYear.replaceAll("," ""));
+// It's a "SyntaxError: missing ) after argument list",  missing a comma inside the replaceAll.() function.
 
 // c) Identify all the lines that are variable reassignment statements
 
+// Answer: Line 4 and 5 are variable assignment statements
+
 // d) Identify all the lines that are variable declarations
 
+//  Answer: Line 1,2,7 and 8 are variable declearations
+
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+// Answer: ReplaceAll() function clears out all the commas in the strings, the Number() converts the strings to numbers to help with calculation

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

@@ -1,25 +1,40 @@
-const movieLength = 8784; // length of movie in seconds
+// const movieLength = 3661; // length of movie in seconds
+const movieLength = 100.65;
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
 
 const remainingMinutes = totalMinutes % 60;
 const totalHours = (totalMinutes - remainingMinutes) / 60;
 
-const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
+const result = `${String(totalHours).padStart(2, "0")}:${String(remainingMinutes).padStart(2, "0")}:${String(remainingSeconds).padStart(2, "0")}`;
 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: There is only 6 variable declaration altogether in this program
+
 // b) How many function calls are there?
 
+// Answer:  There is only 1 call function in this program 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: The % symbol represent the remainder (modulo) operator, it calculates the leftover/remainder after integer division.
+// Answer: % 60 divides the movieLength by 60 and returns only the remainder.
+
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
 
+// Answer: Line 4 expression helps to eliminate any remainder from the equation, so its left with a clean multiple of 60 to avoid any decimal
+
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 
+// Answer: It represent the total duration of the movie formatted into hours, minutes and seconds 
+// Answer: A better name could be "totalMovieDuration"
+
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+
+// Answer: It will work for integer values and will give us clear and clean result using this code. However, the result would not be clean as this using float values

Sprint-2/3-mandatory-interpret/3-to-pounds.js

@@ -25,3 +25,33 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// Answers: In line 1, a variable "penceString" was created holding the value "399p"
+
+// 3-6. substring(0, penceString.length - 1):
+// the first argument is the start index, so 0 means the first character
+// penceString.length is 4 because there are 4 characters, at indexes 0 to 3
+// the second argument is the end index and it is exclusive, it stops just before that position
+// length - 1 is 3, so it stops before index 3, dropping the "p" and leaving "399"
+
+// 8. padStart(3, "0") pads the start until the string is at least 3 characters long
+// "399" is already 3, so nothing gets added here
+
+// Line 9-12 created a variable "pounds" and used the subString(0, paddedPenceNumberString.length - 2 ) 
+// to start count from 0 of the "penceStringWithoutTrailingP" value which is 399. 
+// It further removed the last two number in the value by checking the length of the value with "paddedPenceNumberString.length" 
+// And subtracting 2 (3 - 2), because length - 2 subtract 2 from the character/value count. Cutting out 99 and leaving the value to remain 3.
+
+// Line 14-16 created a variable "pence", using the subString(paddedPenceNumberString.length - 2) 
+// to check the length of the value of the variable "paddedPenceNumberString" which remain 399 from line 8
+// substring(length - 2) takes the last 2 characters of the padded value, giving us the pence (99)
+// padEnd(2, "0") makes sure the value is at least 2 characters long, adding "0" if it is shorter
+// in this case the pence value is already 2 characters ("99"), so padEnd adds nothing
+
+// Line 18 printed our codes a formatted style adding the pound sign "£" 
+
+
+
+
+
+

Sprint-2/Prep/facts.js

@@ -0,0 +1,2 @@
+console.log("One fact i love about git is that it allows people to collaborate on projects");
+

Sprint-2/Prep/functions.js

@@ -0,0 +1,66 @@
+console.log("In this exercise I will be learning different functions, and preactising them. ");
+
+let userName = "Matthew";
+let location = "Manchester";
+let favoriteFood = "Jollof rice";
+
+function myInfo(userName, location, favoriteFood) {
+    console.log(`My name is ${userName}` )
+    console.log(`I live in ${location}` )
+    console.log(`My favorite food is ${favoriteFood}` )
+};
+myInfo(userName, location, favoriteFood);
+
+sliceUserName = userName.slice(0, 4);
+console.log(`My friends love to call me ${sliceUserName}`);
+
+sliceLocation = location.lastIndexOf("h");
+console.log(sliceLocation);
+
+const number1 = "50";
+const number2 = "100";
+const result = Number(number1) + Number(number2);
+console.log(result);
+
+let hobby = "I love football and traveling";
+let moreHobby = hobby.replaceAll("football", "swiming").replaceAll("traveling", "hiking");
+console.log(moreHobby);
+
+const passion = hobby.substring(6, 15);
+console.log(passion);
+
+const luckyNumber = "7";
+const changeNumber = luckyNumber.padStart(5, "0");
+console.log(changeNumber);
+
+const anotherNumber = luckyNumber.padEnd(5, "0");
+console.log(anotherNumber);
+
+const carPrice = 30000.50;
+const updatedCarPrice = Math.floor(carPrice);
+console.log(updatedCarPrice);
+
+const addNumber = 20;
+const addNumber2 = 30;
+const addNumber3 = addNumber + addNumber2;
+const addNumberResult = Math.random() * addNumber3
+console.log(addNumberResult);
+
+const repeatedText = "one, two, three";
+const lastOnePosition = repeatedText.lastIndexOf("one");
+console.log(lastOnePosition);
+
+// const yourName = prompt("Please enter your name: ");
+// const yourLocation = prompt("Please enter your location: ");
+// const yourHobby = prompt("Enter your hobby: ");
+// const yourFavoriteFood = prompt("Please enter your favorite food: ")
+
+// function userInfo(yourName, yourLocation, yourHobby, yourFavoriteFood) {
+//     console.log(`Your name is ${yourName}`)
+//     console.log(`You live in ${yourLocation}`)
+//     console.log(`Your hobby is ${yourHobby}`)
+//     console.log(`Your favorite food is ${yourFavoriteFood}`)
+// }
+
+// userInfo(yourName, yourLocation, yourHobby, yourFavoriteFood)
+// Chrome devOps prompt function, variable and parameters

Sprint-2/Prep/greeting.js

@@ -0,0 +1,34 @@
+const greeting = "Hello There !";
+console.log(greeting);
+
+const name = "Matt";
+console.log(`${greeting}, I am ${name}`);
+
+let location = "Manchester";
+console.log(`${greeting}, my name is ${name} and i live in ${location} `);
+
+let location2 = "London";
+console.log(`${greeting}, I am ${name}, I will be traveling to ${location2} soon`);
+
+console.log("Dog" === "Mango");
+
+console.log(5 + 15 === 20);
+
+console.log("dog" == "dog");
+
+console.log(40+5 == "45");
+
+console.log(60+40 > 50);
+
+console.log(100<= 90);
+
+
+
+
+
+
+
+
+
+
+

Sprint-2/Prep/password.js

@@ -0,0 +1,16 @@
+const password = "Matt123";
+const userInput = "Anything";
+const administrator = "Anything";
+let response = " ";
+
+if (password === userInput) {
+    response = "Login successful";
+} else if (userInput === administrator) {
+    response = "Welcome to the site";
+}
+else {
+    response = "Please try again";
+}
+console.log(response);
+
+