London|May-2025|Alexandru Pocovnicu|Coursework|sprint 1

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

@@ -2,5 +2,10 @@ let count = 0;
 
 count = count + 1;
 
+// the "=" assigns value to count which is the sum of count + 1 and which now is "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
+// '=' assigns a new value to the variable 'count'

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

@@ -5,7 +5,10 @@ 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.charAt(0)+middleName.charAt(0)+lastName.charAt(0);
+
+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 = ;
-
-// https://www.google.com/search?q=slice+mdn
+const dir = filePath.slice(0,lastSlashIndex);
+const dot= base.lastIndexOf(".")
+const ext = base.slice(dot)
+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

@@ -2,8 +2,9 @@ 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
 // 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
+// num represents a pseudo-random number and each time it's run it returns a number between 1 and 100

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?*/
+// we turn it in to a comment

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 ?
+const cityOfBirth = "Bolton";
 
 console.log(`I was born in ${cityOfBirth}`);
-const cityOfBirth = "Bolton";

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

@@ -1,6 +1,6 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
-
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits)
 // 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

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

@@ -1,2 +1,3 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const _12HourClockTime = "20:53";
+const _24hourClockTime = "08:53";
+console.log(_12HourClockTime,_24hourClockTime)

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
+//Answer: 5 function calls on lines 4,5,10
 
 // 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?
+//Answer : error on line 5-missing coma, fixed it by adding coma
 
 // c) Identify all the lines that are variable reassignment statements
+//Answer: lines 4 and 5
 
 // d) Identify all the lines that are variable declarations
+//Answer: lines 1,2,7,8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//Answer: it elimkinates the comma from '10,000' and turns it from a string to a number

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 823484; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -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?
+//Answer: 6 variable declarations
 
 // b) How many function calls are there?
+//Answer: 1 function call
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+//Answer: it represents the seconds remaining after dividing 8784 to 60 which is 24seconds
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//Answer: it represents the duration of the movie in minutes without the 24 seconds remainder
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+//Answer: it represents the movie duration in hh:mm:ss , better name 'movieDuration'
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//Answer:can't check for all values but it did work for the values I used

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

@@ -4,17 +4,20 @@ const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
+console.log(penceStringWithoutTrailingP)
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+console.log(paddedPenceNumberString)
+
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
-
+console.log(pounds)
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
-
+console.log(pence)
 console.log(`£${pounds}.${pence}`);
 
 // This program takes a string representing a price in pence
@@ -25,3 +28,16 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+/* 3-6. const penceStringWithoutTrailingP = penceString.substring(
+  0,
+  penceString.length - 1
+);: creates a string variable called penceStringWithoutTrailingP with the value "399"
+9. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");:it creates a string variable  has at least three characters
+if it doesn't it will add one or more '0'
+12-15. const pounds = paddedPenceNumberString.substring(
+  0,
+  paddedPenceNumberString.length - 2
+);:it creates a string variable with the value of '3'
+17-19. it creates a string variable that has the value of the last 2 characters from '399' which is '99'
+21.it logs the values of £ with pounds ,. ,  and pence combined resulting in £3.99
+*/

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

@@ -16,3 +16,4 @@ 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`?
+Answer: prompt opens a pop up at the top of the page which contains the question 'what is your name' and the return value of prompt is the name i introduced

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

@@ -4,13 +4,14 @@ In this activity, we'll explore some additional concepts that you'll encounter i
 
 Open the Chrome devtools Console, type in `console.log` and then hit enter
 
-What output do you get?
+What output do you get?--- ƒ log() { [native code] }
 
-Now enter just `console` in the Console, what output do you get back?
+Now enter just `console` in the Console, what output do you get back?---- console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
 
-Try also entering `typeof console`
+Try also entering `typeof console`----object
 
 Answer the following questions:
 
-What does `console` store?
+What does `console` store?----functions
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+The "." is accessing the "log" and "assert" functions inside the console