London | Sep-2025 | Gislaine Della Bella | Structuring and Testing Data | Sprint-1

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
+
+//line 3 is a statment. It is adding 1 to the value of the variable count 

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

@@ -1,11 +1,20 @@
+
+
+// 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.
+// https://www.google.com/search?q=get+first+character+of+string+mdn
+
 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 = ``;
 
-// https://www.google.com/search?q=get+first+character+of+string+mdn
+let initials= `${firstName.charAt(0)}${middleName.charAt(0)}${lastName.charAt(0)}`;
+//test
+//let initialsSecond = `${firstName.charAt(3)} ${middleName.charAt(2)} ${lastName.charAt(4)}`;
+
+console.log (initials);
+
+
 

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

@@ -8,16 +8,22 @@
 // └──────┴──────────────┴──────┴─────┘
 
 // (All spaces in the "" line should be ignored. They are purely for formatting.)
-
+                  //home / user /dir /                          file.txt; 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
-const lastSlashIndex = filePath.lastIndexOf("/");
+const lastSlashIndex = filePath.lastIndexOf("/"); //=index 47 /
 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
+const dir = filePath.slice(0, lastSlashIndex + 1);
+console.log(`The directory part is: ${dir}`);
+
 // Create a variable to store the ext part of the variable
+const lastDotIndex = filePath.lastIndexOf("."); // look for the last Dot
+const extPart = filePath.slice(lastDotIndex + 1); 
+console.log(`The extension part is: ${extPart}`); 
 
-const dir = ;
-const ext = ;
+// https://www.google.com/search?q=slice+mdn
 
-// https://www.google.com/search?q=slice+mdn

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

@@ -2,8 +2,21 @@ const minimum = 1;
 const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
+//const num = Math.floor(Math.random() * (maximum - minimum)) + minimum;
+console.log(num);
 
 // In this exercise, you will need to work out what num represents?
+
+//Num represents a random number between 1 to 100 inclde both becasue we are adding 1
+
 // Try breaking down the expression and using documentation to explain what it means
+
+//(maximum - minimum + 1) = get maximum number 100 extract the minimum 1 add +1 to incluide 100.
+//+ minimum add 1
+
+//math.radom = gets randm number between 0 and 1 but never 1 so we add +1 to incluide 1
+//Math.floor= will raounds donw to the nearest whole number
+
+
 // 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

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?
+//coment the lines

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

@@ -1,4 +1,7 @@
 // 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);
+
+// error if we intend to change the value assing to a variable we need to use "LET"

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

@@ -1,5 +1,8 @@
 // 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}`);
+
+// Error trying to use the variable "cityOfBirth"before declare it 

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

@@ -1,9 +1,18 @@
-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
+
+
+// it will not work becase Slice is a string methodo. 
+// To work here need to convert the number to string 
+
+const cardNumber = 4533787178994213;
+const last4Digits = cardNumber.toString().slice(-4);
+
+console.log(last4Digits);

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

@@ -1,2 +1,9 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+// const 12HourClockTime = "20:53";
+// const 24hourClockTime = "08:53";
+
+const hour12ClockTime = "20:53";
+const hour24ClockTime = "08:53";
+
+console.log(hour12ClockTime,hour24ClockTime);
+
+// variable names  can't start with nunmbers

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 +12,19 @@ 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
+// 3 functions:
+// carPrice = Number(carPrice.replaceAll(",", ""));
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+// const percentageChange = (priceDifference / carPrice) * 100;
 
 // 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?
+//Error was in line 5 missing a coman between the get to replace ""
 
 // c) Identify all the lines that are variable reassignment statements
+// lines 4, 5 
 
 // d) Identify all the lines that are variable declarations
+// lines 1 and 2 , 7 and 8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// it is converting the numbers prices to real numbers replace the commnas to empty string so takrs the commans out

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

@@ -1,6 +1,6 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 8784; // decaring length of movie in seconds
 
-const remainingSeconds = movieLength % 60;
+const remainingSeconds = movieLength % 60; // decalring the remaining seconds 
 const totalMinutes = (movieLength - remainingSeconds) / 60;
 
 const remainingMinutes = totalMinutes % 60;
@@ -12,14 +12,30 @@ 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?
+// 4 on lines : 1, 3 and 6 and 9
+
 
 // b) How many function calls are there?
+//2
+// lines 4 and 7
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// uUses the operator "Reminder". divinfding the month lenth by 60 ( minutes) to get homw many second reminds in the month lengh= 
+// 8784 / 60 = 146 minutes and remind 24 seconds letf
+
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// line 4 find how many  total minutes has in the month lenght. 
+// first gets te toal seconds less the reminds sconds. it gives the results of total seconds and divides it 
+//by the 60 ( minutes) = results homw many minutes has in the total lenght or movieTotalLength
+//8784 - 24 ==== 8760
+// 8760 / 60 equals 146 minutes
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// represents how long in time is the movie. could be caled= const timeMovie
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// i guess it wouldnt worrk for negative numbers but actualy evething envolves time is dificult to 
+//my mind explain. I need to search for more simples expamples to associete this Reminder operetar in time.
+// this was a dificult mind flows to me :(

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

@@ -1,4 +1,4 @@
-const penceString = "399p";
+const penceString = "9p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
@@ -25,3 +25,17 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+//lines 3 to 6= we asing a variable "penceStringWithoutTrailingP".
+//we  use substring to start from index 0 and get the lenght 4 - 1 = 3 
+// so sbtstring start form 0 and the length has 3 = 399
+
+
+// line 8. We declare variale "const paddedPenceNumberString" make sure the number number has least 3 digits
+
+//line 9 to 12= use substring to extrac from start form index 0 and string lenght taking 2 digits = reusl 3
+
+/// lines 14 to 16= const to the pence: the start indext for Substring will be 3-2= 1
+// true i got confused . padend make sure the pence part has 2 digits. if it dosen;t padend will add the 0 to it. if it has already 2 digits will stay the same 
+
+// line 18 = template literal with the results £3.99

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

@@ -11,8 +11,11 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+Pop up a alert mesage 
 
 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`.
 
+
 What effect does calling the `prompt` function have?
 What is the return value of `prompt`?
+I typed my name the outbput in the conselo comes undefined

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

@@ -14,3 +14,17 @@ Answer the following questions:
 
 What does `console` store?
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+
+My ansers come form AI as i dintn't undestand the excercise but now I know :
+
+What does console store?
+console stores an object. This object contains various properties, many of which are functions (also known as methods when they belong to an object). These functions provide utilities for debugging and logging information to the developer console.
+
+What does the syntax console.log or console.assert mean? 
+In particular, what does the . mean?
+The syntax console.log or console.assert means you are accessing a property (in this case, a function) of the console object.
+
+The . (dot) is called the property accessor or member access operator. It is used to access properties or methods that belong to an object. In simple terms, it means "look inside this object for something named..."
+
+So, console.log means "access the log function that is a part of the console object."