Birmingham | 26-ITP-May | Toluwalase Tiamiyu | Sprint 1 | Coursework

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
+
+// The = served as the executer of the assignment operation.

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

@@ -1,11 +1,16 @@
+// 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 firstName = "Creola";
 let middleName = "Katherine";
 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 = ``;
+function getInitials() {
+  let initials = `${firstName[0]}${middleName[0]}${lastName[0]}`;
+  return initials;
+}
 
-// https://www.google.com/search?q=get+first+character+of+string+mdn
+console.log(getInitials());
 
+// Export the initials for testing instead of returning at top-level
+module.exports = getInitials;

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

@@ -17,7 +17,9 @@ 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);
+const ext = base.slice(base.lastIndexOf(".") + 1);
 
-// https://www.google.com/search?q=slice+mdn
+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

@@ -1,7 +1,10 @@
 const minimum = 1;
 const maximum = 100;
 
-const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
+for (let i = 0; i < 5; i++) {
+  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

Sprint-1/2-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?
+
+/* To prevent the computer from executing these lines of code, you can comment them out, 
+you can use `//` for single-line comments or `/* */` for multi-line comments, like i demonstated above.

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 +1,5 @@
 // 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}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -1,9 +1,22 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+//const cardNumber = 4533787178994213;
+//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
+
+//PREDICTION:
+//the code wont work because the card number isnt in ("") and the computer wont be able to apply the .slice due to this.
+
+//THE ERROR:
+//cardNumber.slice is not a function
+
+//YES! the error is what i predicted.
+
+//FIX:
+const cardnumber = "4533787178994213";
+const last4Digits = cardnumber.slice(-4);
+console.log(last4Digits);

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

@@ -1,2 +1,5 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+const twentyFourHourClockTime = "20:53";
+
+//The Error:
+//The code would not run because only a letter can follow the 'const' and 'let' declarations in javascript.

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

@@ -12,11 +12,26 @@ 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. Line 5: carPrice.replaceAll(",", "")
+    //2. Line 6: priceAfterOneYear.replaceAll(",", "")
+    //3. Line 8: console.log(`The percentage change is ${percentageChange}`)
 
 // 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 in line 5, the error is occurring because "comma missing "," and "" for priceAfterOneYear.replaceAll("," "") function call.
 
 // 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?
+    //The expression is converting the string representation of the car price to a number by first removing the comma.
+
+    //Purpose: 
+    //To allow the computer identify the value of the car price as a number so that it can be used in calculations.

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

@@ -12,14 +12,33 @@ 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?
+//1.movieLength
+//2.remainingSeconds
+//3.totalMinutes
+//4.remainingMinutes
+//5.totalHours
+//6.result
 
 // b) How many function calls are there?
+//1. Line 10: 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
 
+//The % symbol is called the modulus operator. It returns the remainder of a division operation.
+// In this case, movieLength % 60 calculates the remaining seconds after dividing the total movie length by 60 (the number of seconds in a minute).
+// This gives us the number of seconds that do not make up a full minute in the movie length.
+
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// The expression (movieLength - remainingSeconds) / 60 calculates the total number of minutes in the movie by subtracting the remaining seconds from the total seconds
+// and then dividing by 60.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// The variable result represents the formatted time of the movie in hours, minutes, and seconds. A better name for this variable could be movieDuration.
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//It will do the math perfectly for most normal positive numbers, but there are a few situations where the code will act wierdly.
+//1. The "Single Digit" Visual Bug (Zero-Padding)
+//2. Negative numbers
+//3.Decimal numbers (floats and non integers)
+//4. invalid data types (like strings, objects, etc.)

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

@@ -25,3 +25,19 @@ 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): This removes the letter 'p' from the end of the string,
+// leaving just the numbers part of the string. The substring method is used to extract a portion of the string,
+// starting from index 0 and ending at the second-to-last character (length - 1).
+
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); This is to ensure the numbers presented after the substring is at least 3 characters long,
+// if the number is shorter the computer would add '0' or '0's in front of the number to make it 3 digits long.
+
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2):
+// This extracts the pounds part of the string by taking all characters except the last two.
+
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+// This extracts the pence part of the string by taking the last two characters and ensures that it is at least 2 characters long by adding '0' at the end
+// if necessary as this is because we need the decimal value.
+
+// 6. console.log(`£${pounds}.${pence}`): This outputs the final answer in the format of pounds and allows the user to see the final result also.

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

@@ -16,3 +16,11 @@ 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`?
+
+MY RESULTS:
+
+After running the alert function the browser to immediately open a pop up box at the top of the screen displaying what i inputted 'Hello World!'.
+
+After running the prompt 'let myName = prompt("what is your name") the browser opened a pop up window that allowed me to type in my name and it was saved after clicking OK.
+
+Running the 'prompt' "myName" the browser displayed the name i inputted in the console immediately.

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

@@ -14,3 +14,15 @@ Answer the following questions:
 
 What does `console` store?
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+OUTPUTS
+`console.log` came back as ƒ log() { [native code] } after hitting enter
+
+`console` came back as console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
+
+typeof console came back as 'object'
+
+ANSWERS
+The console stores a collection of functions and data that allow javascript code to interact with the browser's debugging tools
+
+The "." is known as a property accessor, it acts as a bridge telling the javascript to look inside the object on the left to find a specific item on the right.