London | 26-ITP-SEPT | Carol Nassuna | Sprint 2 | Coursework

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

@@ -4,3 +4,6 @@ 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
+
+//Answer: The = means assignment. The value of count is 0 but it increments by 1
+//CN - added comment to have a clean commit - updated 

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

@@ -1,10 +1,17 @@
 const firstName = "Creola";
 const middleName = "Katherine";
 const lastName = "Johnson";
+// const initial = "initials";
+// const index = 1;
 
+// console.log('The ${Initial} ${index} is ${firstName.charAt(index)}');
 // 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.
 
-const initials = ``;
+const initials = firstName[0] + middleName[0] + lastName[0];
+console.log(initials);
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
+
+// CN - added comment to have a clean commit. updated 
+

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

@@ -13,11 +13,17 @@ const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
 const base = filePath.slice(lastSlashIndex + 1);
 console.log(`The base part of ${filePath} is ${base}`);
+// console.log('The dir path of ${dir} is ${filePath}.${lastSlashIndex}'); 
+
 
 // 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);
+const ext = base.slice(base.lastIndexOf("."));
+
+console.log(`The dir part of ${filePath} is ${dir}`);
+console.log(`The ext part of ${base} is ${ext}`);
 
-// https://www.google.com/search?q=slice+mdn
+// https://www.google.com/search?q=slice+mdn
+// CN - added comment to have a clean commit.

Sprint-2/1-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;
+// (0.68 * 100 ) + 1
+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
+
+// Answer: For calculations i utilised BODMAS formula solving numbers in brackets first, multiplication, subtraction and addition
+// I used 0.68 for math.floor(random number) + 1
+// Sum = 69
+// CN - added comment to have a clean commit .

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?
+
+// I have commented out the lines. The computer removes commented lines from code compilation
+// CN - added comment to have a clean commit.

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

@@ -1,4 +1,10 @@
 // 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)
+
+// The TypeError: Assignment to constant variable implies we are trying to reassign the variable twice.
+// This case, I have used let instead in order to allow the variable to be reused.
+// CN - added comment to have a clean commit .

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

@@ -1,5 +1,10 @@
 // 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}`);
+
+
+// The error is ReferenceError: Cannot access 'cityOfBirth' before initialization
+// Answer: I switched the order by declaring the const first before calling /printing 
+// CN - added comment to have a clean commit .

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

@@ -1,9 +1,17 @@
 const cardNumber = 4533787178994213;
-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?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+//Prediction was the code would run successfully without error although with the wrong results due to absence of syntax errors in the file
+// Error returned: TypeError: cardNumber.slice is not a function
+// Lesson learnt here; slice method is only available for strings or arrays not numbers
+// So converted the cardNumber into a string first
+// CN - added comment to have a clean commit.

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

@@ -1,2 +1,8 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+const twentyFourHourClockTime = "20:53";
+console.log(twelveHourClockTime);
+console.log(twentyFourHourClockTime);
+
+// Error - SyntaxError: Invalid or unexpected token
+// lesson learnt - variables cannot start with a number
+// CN - added comment to have a clean commit .

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;
@@ -12,11 +12,20 @@ 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
-
+// 2
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ","));
 // 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) error = SyntaxError: missing ) after argument list
+// (",", ",")); - added , between quoted values
 // c) Identify all the lines that are variable reassignment statements
-
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ","));
 // d) Identify all the lines that are variable declarations
-
+//let carPrice = "10,000";
+//let priceAfterOneYear = "8,543";
+//const priceDifference = carPrice - priceAfterOneYear;
+//const percentageChange = (priceDifference / carPrice) * 100;
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// e) cleans the amount format by removing characters such as , and leaving only number
+// CN - added comment to have a clean commit.

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = -10; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +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?
+// 6 variables
 
 // b) How many function calls are there?
-
+// 2
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// It means 60 % remainder of Movie length
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// totalMinutes is assigned a value of the result from (movieLength - remainingSeconds) / 60;
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// I think its the total movie length with a timer. Based on research it appears to be template literal variable as it mixes static text with dynamic data. Sorry I don't fully understand this bit yet
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//any number greater than zero returns a valid positive hour, minute or seconds result. Changing the length to 0 returns 0:0:0. Any negative length returns negative values
+
+// CN - added comment to have a clean commit .

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

@@ -1,19 +1,13 @@
 const penceString = "399p";
 
 const penceStringWithoutTrailingP = penceString.substring(
-  0,
-  penceString.length - 1
-);
+  0, penceString.length - 1);
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
-const pounds = paddedPenceNumberString.substring(
-  0,
-  paddedPenceNumberString.length - 2
-);
+const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
 
-const pence = paddedPenceNumberString
-  .substring(paddedPenceNumberString.length - 2)
-  .padEnd(2, "0");
+
+const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
 
 console.log(`£${pounds}.${pence}`);
 
@@ -25,3 +19,9 @@ 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): sets penceStringWithoutTRailingP = 399.0 - penceString -1 = 39
+// 3. const paddedPenceNumberString - ensures the figure is 3 characters to taking us back to 399
+// 4 const pounds - removes 2 characters from the amount = 3
+// 5. const pence - adds the amount by 2 characters taking us back to either 39 or 99
+// 6. console displays the figures in pounds and pence = 3.99
+// CN - added comment to have a clean commit .

Sprint-2/4-stretch-explore/chrome.md

@@ -13,3 +13,4 @@ Now try invoking the function `prompt` with a string input of `"What is your nam
 
 What effect does calling the `prompt` function have?
 What is the return value of `prompt`?
+// CN - added comment to have a clean commit .

Sprint-2/4-stretch-explore/objects.md

@@ -14,3 +14,4 @@ Answer the following questions:
 
 What does `console` store?
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+// CN - added comment to have a clean commit.

Sprint-2/README.md

@@ -32,4 +32,5 @@ https://developer.mozilla.org/en-US/docs/Web/JavaScript
 
 ## 4 Explore - Stretch 💪
 
-This stretch activity will get you to start exploring new concepts and environments by yourself. It will do so by prompting you to reflect on some questions.
+This stretch activity will get you to start exploring new concepts and environments by yourself. It will do so by prompting you to reflect on some questions..
+.

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

@@ -0,0 +1,8 @@
+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
+
+//Answer: The = means assignment. The value of count is 0 but it increments by 1

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

@@ -0,0 +1,14 @@
+const firstName = "Creola";
+const middleName = "Katherine";
+const lastName = "Johnson";
+// const initial = "initials";
+// const index = 1;
+
+// console.log('The ${Initial} ${index} is ${firstName.charAt(index)}');
+// 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.
+
+const initials = firstName[0] + middleName[0] + lastName[0];
+console.log(initials);
+
+// https://www.google.com/search?q=get+first+character+of+string+mdn

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

@@ -0,0 +1,28 @@
+// The diagram below shows the different names for parts of a file path on a Unix operating system
+
+// ┌─────────────────────┬────────────┐
+// │          dir        │    base    │
+// ├──────┬              ├──────┬─────┤
+// │ root │              │ name │ ext │
+// "  /    home/user/dir / file  .txt "
+// └──────┴──────────────┴──────┴─────┘
+
+// (All spaces in the "" line should be ignored. They are purely for formatting.)
+
+const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
+const lastSlashIndex = filePath.lastIndexOf("/");
+const base = filePath.slice(lastSlashIndex + 1);
+console.log(`The base part of ${filePath} is ${base}`);
+// console.log('The dir path of ${dir} is ${filePath}.${lastSlashIndex}'); 
+
+
+// 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 = filePath.slice(0, lastSlashIndex);
+const ext = base.slice(base.lastIndexOf("."));
+
+console.log(`The dir part of ${filePath} is ${dir}`);
+console.log(`The ext part of ${base} is ${ext}`);
+
+// https://www.google.com/search?q=slice+mdn

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

@@ -0,0 +1,15 @@
+const minimum = 1;
+const maximum = 100;
+
+const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
+// (0.68 * 100 ) + 1
+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
+
+// Answer: For calculations i utilised BODMAS formula solving numbers in brackets first, multiplication, subtraction and addition
+// I used 0.68 for math.floor(random number) + 1
+// Sum = 69

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

@@ -0,0 +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?
+
+// I have commented out the lines. The computer removes commented lines from code compilation

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

@@ -0,0 +1,9 @@
+// trying to create an age variable and then reassign the value by 1
+
+let age = 33;
+age = age + 1;
+
+console.log(age)
+
+// The TypeError: Assignment to constant variable implies we are trying to reassign the variable twice.
+// This case, I have used let instead in order to allow the variable to be reused.

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

@@ -0,0 +1,9 @@
+// Currently trying to print the string "I was born in Bolton" but it isn't working...
+// what's the error ?
+
+const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+
+// The error is ReferenceError: Cannot access 'cityOfBirth' before initialization
+// Answer: I switched the order by declaring the const first before calling /printing 

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

@@ -0,0 +1,16 @@
+const cardNumber = 4533787178994213;
+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?
+// Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+//Prediction was the code would run successfully without error although with the wrong results due to absence of syntax errors in the file
+// Error returned: TypeError: cardNumber.slice is not a function
+// Lesson learnt here; slice method is only available for strings or arrays not numbers
+// So converted the cardNumber into a string first

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

@@ -0,0 +1,7 @@
+const twelveHourClockTime = "8:53pm";
+const twentyFourHourClockTime = "20:53";
+console.log(twelveHourClockTime);
+console.log(twentyFourHourClockTime);
+
+// Error - SyntaxError: Invalid or unexpected token
+// lesson learnt - variables cannot start with a number