Barcelona | oct2025-1 | Xinxi Chen | Sprint1

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

@@ -4,3 +4,4 @@ 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
+It is performing an assignment operation, specifically an increment.

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

@@ -1,11 +1,11 @@
-// The diagram below shows the different names for parts of a file path on a Unix operating system
+// The diagram below shows the differ
 
 // ┌─────────────────────┬────────────┐
 // │          dir        │    base    │
 // ├──────┬              ├──────┬─────┤
 // │ root │              │ name │ ext │
 // "  /    home/user/dir / file  .txt "
-// └──────┴──────────────┴──────┴─────┘
+// └──────┴──────────────┴──────┴─────┘ent names for parts of a file path on a Unix operating system
 
 // (All spaces in the "" line should be ignored. They are purely for formatting.)
 
@@ -17,7 +17,7 @@ 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(base.lastIndexOf("."));
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -2,6 +2,8 @@ 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

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 +1,4 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
-age = age + 1;
+let age = 33;
+age++;

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

@@ -1,5 +1,4 @@
 // 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

@@ -1,5 +1,6 @@
-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

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twentyFourHourClockTime = "20:53";
+const twelveHourClockTime = "08:53";

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 +12,15 @@ 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 6 function calls in this file.
+    //Line 4: Number() and replaceAll()
+    //Line 5: Number() and replaceAll()
+    //Line 8: console.log() and ${}//
 // 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 on Line 5, it lacks of ',' between "," ""//
 // c) Identify all the lines that are variable reassignment statements
-
+    //Line 4, Line 5//
 // d) Identify all the lines that are variable declarations
-
+    //Line 1, Line 2, Line 7, Line 8//
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+    //It converts the string to Number//

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 9789; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +12,16 @@ 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.
 // b) How many function calls are there?
+    //There is 1.
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+   //totalMinutes's value is the moiveLength reduce its remainding seconds then divide it in 60.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+    //The length of movie in hours's format. movieLengthInHour
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+    //It works for all different value. Because moiveLength is the initial declaration.

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

@@ -24,4 +24,9 @@ console.log(`£${pounds}.${pence}`);
 // Try and describe the purpose / rationale behind each step
 
 // To begin, we can start with
-// 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 1. const penceString = "399p": initialises a string variable with the value "399p", We need a starting string representing the price in pence to work with.
+// 2. Line 3-6 removes the 'p' from the end of String. We cannot performing mathematical formatting on the letter 'p'.
+// 3. Line 8 Ensure the string is at least 3 characters long by adding specific padding zeros to the start if necessary.
+// 4. Line 9-12 Extracts the "pounds" part of the price(except the last two digits). In currency, the last two digits are always the pence.
+// 5. Line 14-16 Extracts the "pence" part (the last two digits).
+// 6. Line 18 Assembles the final string and prints it to the console.//