London | 26-ITP-May | Talia Kucuk | Sprint 1 | Coursework

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

@@ -2,5 +2,4 @@ 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
+// The expression on the right is evaluated. The = operator assigns the result to the variable on the left, updating the value stored in count. So it took the value of count which was 0 and added 1 to equal 1 and assigned that value to the variable of count.

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

@@ -5,7 +5,7 @@ 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 = ``;
+let initials = firstName[0] + middleName[0] + lastName[0];
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

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

@@ -11,13 +11,14 @@
 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
+const lastDotIndex = filePath.lastIndexOf(".");
 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
 
-const dir = ;
-const ext = ;
+const dir = filePath.slice(0, lastSlashIndex);
+const ext = filePath.slice(lastDotIndex);
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -3,7 +3,7 @@ const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
-// 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
+// minimum and maximum store the lowest and highest numbers that can be generated. 
+// Math.random() generates a random decimal between 0 and 1. This value is multiplied by (maximum - minimum + 1) to produce a random number within the required range.
+// Math.floor() rounds the result down to the nearest whole number producing a number from 0 to 99. 
+// Minimum is then added, shifting the range to 1–100. This ensures that every whole number between 1 and 100 has an equal chance of being generated.

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

@@ -1,2 +1,3 @@
-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?
+//Answer: We add // to turn the text into comments 

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 the variable from const (which cannot be reassigned) to let

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

@@ -1,5 +1,7 @@
 // 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}`);
+
+// changed it so that the variable was declared first 

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

@@ -1,9 +1,6 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().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 thought the issue might be something to do with the number given (-4) but it's actually the fact that cardNumber.slice is not a function.
+// Slice is not a function for numbers - it's for strings
+// To solve this we can turn the card number into a string by using toString() - this converts the number to a string temporarily rather than changing the card number to a string itself.

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";
+
+// variables cannot start with a number

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 +12,12 @@ 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
 // 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?
-
+// There was a missing ','
 // 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, 2, 7 and 8 are variable declarations
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// This expression is replacing the , in '10,000' with nothing - essentially removing it. Number() function can then convert the string into a number, allowing it to be used in calculations such as finding the price difference and percentage change.

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

@@ -12,14 +12,15 @@ 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.
 // b) How many function calls are there?
-
+// There is 1 function call - 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
-
+// The % operator returns the remainder after one number is divided by another. In this expression, movieLength % 60 calculates the remaining seconds after converting the total movie length into whole minutes. Since there are 60 seconds in a minute, it gives the number of seconds left over.
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+// The expression calculates the total number of complete minutes in the movie length by subtracting the remaining seconds and then dividing the remaining seconds by 60.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+// movieDuration would be a better variable name
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// it works with a positive whole number but if your introduce decimal numbers or negative numbers the calculations will no longer work 

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

@@ -25,3 +25,7 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 3-6. removes the p from "399p"
+// 8. If the string is shorter than 3 characters, it will add 0s to the front
+// 9-12. Extracts the pound part of the string
+// 14-6. Extracts the pence part of the string