London | 26-ITP-May | Jorvan White | Sprint 1 | Coursework

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

@@ -4,3 +4,7 @@ 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
+
+// = is assigning the value of 'count', 
+// 'let' is a declararation than enables its subject (count) to be changed
+// line 3 is taking the current value in line 1 (0) and by using '=' it is reassigning the value of 'count' to equal itself plus 1

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

@@ -4,8 +4,13 @@ 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.
+const firstInitial = firstName .charAt(0);
+const middleInitial = middleName .charAt(0);
+const lastInitial = lastName .charAt(0);        
 
-let initials = ``;
+let initials = firstInitial + middleInitial + lastInitial;
+
+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 +17,9 @@ 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);
+console.log(`The dir part of ${filePath} is ${dir}`);
+const lastDotIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastDotIndex + 1 )
+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 +7,10 @@ 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 - rounds the number to the nearest integer (whole number)
+//Math.random - generates a random number between 0 (inclusive) and 1 (exclusive)
+//1. The first caluculation is Math.random * maximum (100) - minimum (1) + 1
+//2. The next calculation is Math.floor of the result of the first calculation
+//3. The final calculation is adding the minimum (1) to the result of the second calculation
+// Due to the use of Math.random, the value of num will be different each time the program is run, but it will always be a whole number between 1 and 100

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 +1,6 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+
+//changed 'const' to 'let' which makes it able to change

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

@@ -1,5 +1,6 @@
 // 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";
+//Spelling Error - cityofBirth is misspelled as cityOfBirth in the console.log statement.

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

@@ -1,4 +1,4 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
@@ -7,3 +7,8 @@ const last4Digits = cardNumber.slice(-4);
 // 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: I believe the code won't work because the slice method is incorrect. The slice method is used for strings.
+//Error: TypeError: cardNumber.slice is not a function
+//Needed to add "" to make it a string.
+

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

@@ -1,2 +1,4 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+const twentyfourHourClockTime = "20:53";
+
+//changed '12' to 'twelve' and '24' to 'twentyfour' in order to fix the error.

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 +12,16 @@ 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
+//There are 5 function calls on lines 4,5,7,8 and 10
 
 // 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 Column 60 was missing a ',' to separate the fuction.
 
 // c) Identify all the lines that are variable reassignment statements
+//LInes 4 and 5 are variable reassignment statements.
 
 // d) Identify all the lines that are variable declarations
+//Lines 1 and 2 are variable declarations.
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//This is removing the commas to convert the string into a number for equations

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

@@ -12,14 +12,20 @@ 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 6 variable declarations in this program: movieLength, remainingSeconds, totalMinutes, remainingMinutes, totalHours, and result.
 
 // b) How many function calls are there?
+// There are 5 function calls in this program: On lines 3,4 6,7 and 9.
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+//movie % 60 represents the remainder of the division of movielenght by 60.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// The expression is an Assignment operator that assigns its right hand side value and equation to the variable on the left hand side.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// The variable result represents the total hours,minutes and seconds of the movie. A better name for this could be runtime or duration.
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// This code will not work for values of movielength that are less than 60 seconds due to it needing to divide by 60 to get minuetes and hours.

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

@@ -25,3 +25,8 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): removes the trailing "p".
+// 3. paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): pads the number with leading zeros to ensure it has at least 3 digits.
+// 4. pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): Determines that the 'pound' is the first part of the string.
+// 5. pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): Determines that the 'pence' is the last two digits of the string.
+// 6. console.log(`£${pounds}.${pence}`): Outputs the final formatted string representing the price in pounds and pence.

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

@@ -10,7 +10,8 @@ Let's try an example.
 In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
-What effect does calling the `alert` function have?
+What effect does calling the `alert` function have? 
+// The alert function stops the previous input, citing errors and requires it to be fixed 
 
 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`.