From 4537db55b856ac45b92a8de39f290f020edb26b7 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 12:36:32 +0100
Subject: [PATCH 01/23] tried to explain variable redeclaration

---
 Sprint-1/1-key-exercises/1-count.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Sprint-1/1-key-exercises/1-count.js b/Sprint-1/1-key-exercises/1-count.js
index 117bcb2b6..01ba66b16 100644
--- a/Sprint-1/1-key-exercises/1-count.js
+++ b/Sprint-1/1-key-exercises/1-count.js
@@ -4,3 +4,6 @@ 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
+
+// We are updating the previous value of count to a new value. The = operator assigns a new value 
+// to the variable, meaning the data stored in memory is being changed.
\ No newline at end of file

From 2c8408a7939592f9ac050043dde40fcf396b71bb Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 12:37:48 +0100
Subject: [PATCH 02/23] leaned how to use string formatting

---
 Sprint-1/1-key-exercises/2-initials.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/1-key-exercises/2-initials.js b/Sprint-1/1-key-exercises/2-initials.js
index 47561f617..db7d556f7 100644
--- a/Sprint-1/1-key-exercises/2-initials.js
+++ b/Sprint-1/1-key-exercises/2-initials.js
@@ -5,7 +5,8 @@ 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
 
+console.log(initials);
\ No newline at end of file

From e07fba5df3357130fc49e13ade29da222a4663e5 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 12:41:05 +0100
Subject: [PATCH 03/23] learned slice,lastIndexOf and how can we use them
 together for slice

---
 Sprint-1/1-key-exercises/3-paths.js | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Sprint-1/1-key-exercises/3-paths.js b/Sprint-1/1-key-exercises/3-paths.js
index ab90ebb28..ce44994db 100644
--- a/Sprint-1/1-key-exercises/3-paths.js
+++ b/Sprint-1/1-key-exercises/3-paths.js
@@ -14,10 +14,17 @@ const lastSlashIndex = 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
+const dir = filePath.slice(0 ,lastSlashIndex + 1);
+console.log(`The div part of ${filePath} is ${dir}`);
+
+
 // Create a variable to store the ext part of the variable
+const lastDoteIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastDoteIndex);
+console.log(`The ext part of ${filePath} is ${ext}`);
 
-const dir = ;
-const ext = ;
+// https://www.google.com/search?q=slice+mdn
 
-// https://www.google.com/search?q=slice+mdn
\ No newline at end of file
+console.log(lastSlashIndex);
\ No newline at end of file

From b5673e8bb2815c64a65d15eaffeaf18ecdb3f53a Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 12:41:38 +0100
Subject: [PATCH 04/23] explained num represents

---
 Sprint-1/1-key-exercises/4-random.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Sprint-1/1-key-exercises/4-random.js b/Sprint-1/1-key-exercises/4-random.js
index 292f83aab..e869f726b 100644
--- a/Sprint-1/1-key-exercises/4-random.js
+++ b/Sprint-1/1-key-exercises/4-random.js
@@ -3,7 +3,22 @@ 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
+
+
+// order of math calculation - () > ** > * / % > + - (Parentheses first, then Exponentiation 
+// (right to left), then Multiplication/Division/Modulo (left to right), then Addition/Subtraction 
+// (left to right)).
+
+//Math.floor - returns the value of x rounded down to its nearest integer
+//Math.random - returns a random number 
+
+// First, the innermost parentheses are evaluated: (maximum - minimum + 1).
+// Then, the result is multiplied by the random number generated by the Math object.
+// Math.floor rounds the result down to the nearest integer.
+// Finally, the value is added to the minimum.
\ No newline at end of file

From f946b02cf2178b76a014ccf3731b5de37def6440 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 13:34:09 +0100
Subject: [PATCH 05/23] make a comment

---
 Sprint-1/2-mandatory-errors/0.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Sprint-1/2-mandatory-errors/0.js b/Sprint-1/2-mandatory-errors/0.js
index cf6c5039f..3e6a16ca1 100644
--- a/Sprint-1/2-mandatory-errors/0.js
+++ b/Sprint-1/2-mandatory-errors/0.js
@@ -1,2 +1,4 @@
-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?
\ No newline at end of file
+//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 sole this by witting these two as comments 
\ No newline at end of file

From e7ba13d06441b5da1c556201a1fa5b694d3eda14 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 13:34:50 +0100
Subject: [PATCH 06/23] understanding const and let

---
 Sprint-1/2-mandatory-errors/1.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/2-mandatory-errors/1.js b/Sprint-1/2-mandatory-errors/1.js
index 7a43cbea7..953c99674 100644
--- a/Sprint-1/2-mandatory-errors/1.js
+++ b/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;
+
+// we have to use let as it allows the value to be reassign
\ No newline at end of file

From 0def05a9a3be087dd15084794069957e5639bca0 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 13:35:47 +0100
Subject: [PATCH 07/23] understating how does system reads the coder

---
 Sprint-1/2-mandatory-errors/2.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/2-mandatory-errors/2.js b/Sprint-1/2-mandatory-errors/2.js
index e09b89831..97f2edd8d 100644
--- a/Sprint-1/2-mandatory-errors/2.js
+++ b/Sprint-1/2-mandatory-errors/2.js
@@ -1,5 +1,15 @@
 // 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}`);
+// the system reads the code top to bottom and because the variable has been create/define before 
+// the consol.log it can not recognize the variable
+
+//Wrong
+//console.log(`I was born in ${cityOfBirth}`);
+//const cityOfBirth = "Bolton";
+
+//correct
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+

From 6421e9f54286ec36348c78652031f9ab2d3a3cab Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 13:51:45 +0100
Subject: [PATCH 08/23] string method

---
 Sprint-1/2-mandatory-errors/3.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js
index ec101884d..7ad5dfc1a 100644
--- a/Sprint-1/2-mandatory-errors/3.js
+++ b/Sprint-1/2-mandatory-errors/3.js
@@ -7,3 +7,6 @@ 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 - slice is for string not integer
+

From 87d44ebb5556ac69711f74014513b60f05b32087 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 15:09:52 +0100
Subject: [PATCH 09/23] string methods

---
 Sprint-1/2-mandatory-errors/3.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js
index 7ad5dfc1a..85ef3d2a2 100644
--- a/Sprint-1/2-mandatory-errors/3.js
+++ b/Sprint-1/2-mandatory-errors/3.js
@@ -8,5 +8,6 @@ const last4Digits = cardNumber.slice(-4);
 // 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 - slice is for string not integer
+//prediction - slice() is a string method
 
+console.log(last4Digits);
\ No newline at end of file

From 259306e998718302ef0abdb2cd5abef8bf17c396 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 15:11:03 +0100
Subject: [PATCH 10/23] learn about Variable Naming Rules

---
 Sprint-1/2-mandatory-errors/4.js | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/Sprint-1/2-mandatory-errors/4.js b/Sprint-1/2-mandatory-errors/4.js
index 21dad8c5d..e5bddfb48 100644
--- a/Sprint-1/2-mandatory-errors/4.js
+++ b/Sprint-1/2-mandatory-errors/4.js
@@ -1,2 +1,15 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
\ No newline at end of file
+const HourClockTime24 = "20:53";
+const hourClockTime12 = "08:53";
+
+// Go Variable Naming Rules
+// A variable can have a short name (like x and y) or a more descriptive name (age, price, carname, etc.).
+
+// Go variable naming rules:
+
+// A variable name must start with a letter or an underscore character (_)
+// A variable name cannot start with a digit
+// A variable name can only contain alpha-numeric characters and underscores (a-z, A-Z, 0-9, and _ )
+// Variable names are case-sensitive (age, Age and AGE are three different variables)
+// There is no limit on the length of the variable name
+// A variable name cannot contain spaces
+// The variable name cannot be any Go keywords
\ No newline at end of file

From be72b0dd578fe1ade1b8187a958189d9f10f23b6 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 19:29:10 +0100
Subject: [PATCH 11/23] answered the questions

---
 Sprint-1/3-mandatory-interpret/1-percentage-change.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/3-mandatory-interpret/1-percentage-change.js b/Sprint-1/3-mandatory-interpret/1-percentage-change.js
index e24ecb8e1..0c5498b6f 100644
--- a/Sprint-1/3-mandatory-interpret/1-percentage-change.js
+++ b/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
+// 4(.replaceAll), 5(.replaceAll)
 
 // 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?
+// from line :5
+// fix: add , - priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
 // c) Identify all the lines that are variable reassignment statements
+// line  4 , 5
 
 // d) Identify all the lines that are variable declarations
+// line : 1 , 2
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// method replaceAll is changing a specific character and replace it with the one we asked for. 
+// function number which changes a string number value to integers.
+// purpose : is to have a integer instead of a string 

From b47e4999f21eb827ae8ac6c65021d6b7dc74fb88 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 19:32:52 +0100
Subject: [PATCH 12/23] answered the questions

---
 Sprint-1/3-mandatory-interpret/2-time-format.js | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/3-mandatory-interpret/2-time-format.js b/Sprint-1/3-mandatory-interpret/2-time-format.js
index 47d239558..bcfd79eac 100644
--- a/Sprint-1/3-mandatory-interpret/2-time-format.js
+++ b/Sprint-1/3-mandatory-interpret/2-time-format.js
@@ -7,19 +7,31 @@ const remainingMinutes = totalMinutes % 60;
 const totalHours = (totalMinutes - remainingMinutes) / 60;
 
 const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
-console.log(result);
+console.log(totalMinutes);
 
 // 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?
+// 6
 
 // b) How many function calls are there?
+// 1 
 
 // 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 (modulo) returns the remainder of a division. 
+// In this case, it returns how many seconds are left after dividing the total seconds by 60.
+// For example, 8784 % 60 = 24 — so 24 seconds remain.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// we are calculating the total minutes. 
+// we subtract movieLength by remainingSeconds because remaining seconds don't add up to a full min.
+// convert to minute by dividing by 60.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// The variable `result` represents the movie's length in a time format: `HH:MM:SS`. 
+// string format 
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Yes, the code works for all non-negative values of `movieLength`, including 0.
+// However, for values less than 60, it will return 0 hours and 0 minutes
\ No newline at end of file

From cf581dd1366323184a8794db8908438f38060e57 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 19:33:40 +0100
Subject: [PATCH 13/23] explained the code line by line

---
 Sprint-1/3-mandatory-interpret/3-to-pounds.js | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/3-mandatory-interpret/3-to-pounds.js b/Sprint-1/3-mandatory-interpret/3-to-pounds.js
index 60c9ace69..f5067030b 100644
--- a/Sprint-1/3-mandatory-interpret/3-to-pounds.js
+++ b/Sprint-1/3-mandatory-interpret/3-to-pounds.js
@@ -24,4 +24,23 @@ 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": initializes a string variable with the value "399p"
+
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1);
+// .substring - selects a section between the given indexes in a string -> "399", by doing this we remove the "p"
+
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+// The padStart() method pads penceStringWithoutTrailingP with another string (multiple times) until it reaches a given length 3.
+// id we have a one digit number it adds two "004" but if the number is 3 digits will keep it as it is "399"
+
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
+// Extracts the pound portion, which is the first part of the 3-digit string -> "3"
+
+// 5. const pence = paddedPenceNumberString
+// .substring(paddedPenceNumberString.length - 2)
+// .padEnd(2, "0");
+// it is two separate parts
+// first - with substring method we select the two last digits
+// second - ensures that if somehow only one digit is returned it’s padded to two characters by adding a "0" to the end.
+
+// 6. Displays the formatted price in British pounds -> £3.99 or £0.05
\ No newline at end of file

From 3999f6261f83df0b78ed29a0fdb37e7d757e9b48 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 20:25:29 +0100
Subject: [PATCH 14/23] learned what is v8 and node.js

---
 Sprint-1/4-stretch-explore/chrome.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Sprint-1/4-stretch-explore/chrome.md b/Sprint-1/4-stretch-explore/chrome.md
index e7dd5feaf..4d2132653 100644
--- a/Sprint-1/4-stretch-explore/chrome.md
+++ b/Sprint-1/4-stretch-explore/chrome.md
@@ -15,4 +15,7 @@ What effect does calling the `alert` function have?
 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?
+browser displays a popup dialog box
+
 What is the return value of `prompt`?
+is a string containing what they typed.

From d314a9571ce835d53978d56eb8324c46d61aae6d Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sat, 7 Jun 2025 20:27:39 +0100
Subject: [PATCH 15/23] a short view of object oriented languages. what is a
 object and how can we access methods

---
 Sprint-1/4-stretch-explore/objects.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Sprint-1/4-stretch-explore/objects.md b/Sprint-1/4-stretch-explore/objects.md
index 0216dee56..de828f992 100644
--- a/Sprint-1/4-stretch-explore/objects.md
+++ b/Sprint-1/4-stretch-explore/objects.md
@@ -5,12 +5,30 @@ 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?
+ƒ log() { [native code] }
+
 
 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`
+typeof(console);
+'object'
 
 Answer the following questions:
 
 What does `console` store?
+console is a built-in JavaScript object provided by browsers (like Chrome, Firefox, etc.). It stores a collection of functions that help developers log, debug, and inspect values during runtime.
+It doesn’t store data like a variable; instead, it holds methods (a.k.a. functions) like:
+console.log() – print to the console
+console.error() – print errors
+console.warn() – print warnings
+console.assert() – test if an expression is true
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+- `console.log` or `console.assert`
+These are method calls on the console object.
+You're telling JavaScript: "Use the log or assert method that belongs to the console object."
+- the `.` mean
+The dot (.) is the member access operator in JavaScript.
+It accesses a property or method of an object
\ No newline at end of file

From 078e27969a479947fa2902768d6669fc7eb2dcd6 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Thu, 19 Jun 2025 11:49:05 +0100
Subject: [PATCH 16/23] cleaned up the code style

---
 Sprint-1/1-key-exercises/3-paths.js | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/Sprint-1/1-key-exercises/3-paths.js b/Sprint-1/1-key-exercises/3-paths.js
index ce44994db..c2906650c 100644
--- a/Sprint-1/1-key-exercises/3-paths.js
+++ b/Sprint-1/1-key-exercises/3-paths.js
@@ -9,22 +9,13 @@
 
 // (All spaces in the "" line should be ignored. They are purely for formatting.)
 
-const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
-const base = filePath.slice(lastSlashIndex + 1);
-console.log(`The base part of ${filePath} is ${base}`);
+const lastDotIndex = filePath.lastIndexOf(".");
 
+const base = filePath.slice(lastSlashIndex + 1);   // file.txt
+const dir = filePath.slice(0, lastSlashIndex);     // /Users/mitch/cyf/Module-JS1/week-1/interpret
+const ext = filePath.slice(lastDotIndex);          // .txt
 
-// Create a variable to store the dir part of the filePath variable
-const dir = filePath.slice(0 ,lastSlashIndex + 1);
-console.log(`The div part of ${filePath} is ${dir}`);
-
-
-// Create a variable to store the ext part of the variable
-const lastDoteIndex = filePath.lastIndexOf(".");
-const ext = filePath.slice(lastDoteIndex);
-console.log(`The ext part of ${filePath} is ${ext}`);
-
-// https://www.google.com/search?q=slice+mdn
-
-console.log(lastSlashIndex);
\ No newline at end of file
+console.log(`Base part of path: ${base}`);
+console.log(`Dir part of path: ${dir}`);
+console.log(`Ext part of path: ${ext}`);
\ No newline at end of file

From 54f716e8d531b8ef83b4ade30455b763443786ed Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Thu, 19 Jun 2025 13:19:31 +0100
Subject: [PATCH 17/23] describe output, purpose

---
 Sprint-1/1-key-exercises/4-random.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/1-key-exercises/4-random.js b/Sprint-1/1-key-exercises/4-random.js
index e869f726b..ebed977d1 100644
--- a/Sprint-1/1-key-exercises/4-random.js
+++ b/Sprint-1/1-key-exercises/4-random.js
@@ -21,4 +21,7 @@ console.log(num);
 // First, the innermost parentheses are evaluated: (maximum - minimum + 1).
 // Then, the result is multiplied by the random number generated by the Math object.
 // Math.floor rounds the result down to the nearest integer.
-// Finally, the value is added to the minimum.
\ No newline at end of file
+// Finally, the value is added to the minimum.
+
+// the purpose  - To generate a random whole number between minimum and maximum, inclusive.
+// output - It will be a random integer between 1 and 100.
\ No newline at end of file

From f7e6a171bb594d5c2d554f38163bcd6a294880a5 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Thu, 19 Jun 2025 13:21:18 +0100
Subject: [PATCH 18/23] change the number to a string

---
 Sprint-1/2-mandatory-errors/3.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js
index 85ef3d2a2..9cbb1e71b 100644
--- a/Sprint-1/2-mandatory-errors/3.js
+++ b/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

From 72c375fdbe65f61af98d33248715d02deb5c321f Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Thu, 19 Jun 2025 13:23:18 +0100
Subject: [PATCH 19/23] answered all the questions

---
 .../1-percentage-change.js                    | 27 +++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/Sprint-1/3-mandatory-interpret/1-percentage-change.js b/Sprint-1/3-mandatory-interpret/1-percentage-change.js
index 0c5498b6f..321d928a6 100644
--- a/Sprint-1/3-mandatory-interpret/1-percentage-change.js
+++ b/Sprint-1/3-mandatory-interpret/1-percentage-change.js
@@ -12,19 +12,42 @@ 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
-// 4(.replaceAll), 5(.replaceAll)
+// Function calls: 
+// Line 4 - .replaceAll, Number
+// Line 5 - .replaceAll, Number
+// Line 10 - console.log
+
+
 
 // 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?
 // from line :5
 // fix: add , - priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+// Why is the original line causing an error?
+// We were trying to subtract two string values like "30000" - "24000" but 
+// In JavaScript, strings with commas (like "24,000") can’t be parsed directly to numbers 
+// So this fails
+
+
 
 // c) Identify all the lines that are variable reassignment statements
 // line  4 , 5
 
+
+
 // d) Identify all the lines that are variable declarations
-// line : 1 , 2
+// lines : 1 , 2 , 7 , 8
+// Line 1: let carPrice
+// Line 2: let priceAfterOneYear
+// Line 6: const priceDifference
+// Line 7: const percentageChange
+
+
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
 // method replaceAll is changing a specific character and replace it with the one we asked for. 
 // function number which changes a string number value to integers.
 // purpose : is to have a integer instead of a string 
+
+// explain why we want to convert it into an integer?
+// We use Number(carPrice.replaceAll(",", "")) to convert a formatted string into a real number, 
+// so we can do mathematical calculations on it.
\ No newline at end of file

From 1d85b487f7ca00d1093de8e71e568b23a7dfb2b8 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Thu, 19 Jun 2025 13:24:57 +0100
Subject: [PATCH 20/23] changed the variable called result

---
 Sprint-1/3-mandatory-interpret/2-time-format.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Sprint-1/3-mandatory-interpret/2-time-format.js b/Sprint-1/3-mandatory-interpret/2-time-format.js
index bcfd79eac..b738070b5 100644
--- a/Sprint-1/3-mandatory-interpret/2-time-format.js
+++ b/Sprint-1/3-mandatory-interpret/2-time-format.js
@@ -6,7 +6,7 @@ const totalMinutes = (movieLength - remainingSeconds) / 60;
 const remainingMinutes = totalMinutes % 60;
 const totalHours = (totalMinutes - remainingMinutes) / 60;
 
-const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
+const formattedTime = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
 console.log(totalMinutes);
 
 // For the piece of code above, read the code and then answer the following questions
@@ -31,7 +31,7 @@ console.log(totalMinutes);
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 // The variable `result` represents the movie's length in a time format: `HH:MM:SS`. 
 // string format 
-
+// better name can be `formattedTime` or `HHMMSS`
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
 // Yes, the code works for all non-negative values of `movieLength`, including 0.
 // However, for values less than 60, it will return 0 hours and 0 minutes
\ No newline at end of file

From 73cc423bdca08b8461ec0e31078233100587db3c Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Thu, 19 Jun 2025 13:26:04 +0100
Subject: [PATCH 21/23] try the alert function, possible values we get from
 prompt

---
 Sprint-1/4-stretch-explore/chrome.md | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Sprint-1/4-stretch-explore/chrome.md b/Sprint-1/4-stretch-explore/chrome.md
index 4d2132653..3c3e7c509 100644
--- a/Sprint-1/4-stretch-explore/chrome.md
+++ b/Sprint-1/4-stretch-explore/chrome.md
@@ -11,11 +11,18 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+    -It causes the browser to display a modal popup box with the message "Hello world!"
+    -It blocks interaction with the page until the user clicks "OK"
+    -It returns undefined — the purpose is only to notify, not to receive input.
 
 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`.
+const myName = prompt("What is your name?");
+
 
 What effect does calling the `prompt` function have?
 browser displays a popup dialog box
 
 What is the return value of `prompt`?
-is a string containing what they typed.
+    A string - if the user types something and clicks OK
+    An empty string ("") - if they click OK but type nothing
+    null - if the user clicks Cancel

From 77b600c55188f9d02dc5b14397baf8578595a453 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Fri, 20 Jun 2025 10:50:30 +0100
Subject: [PATCH 22/23] fixed the code

---
 Sprint-1/2-mandatory-errors/3.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js
index 9cbb1e71b..4d69e8741 100644
--- a/Sprint-1/2-mandatory-errors/3.js
+++ b/Sprint-1/2-mandatory-errors/3.js
@@ -1,4 +1,4 @@
-const cardNumber = "4533787178994213";
+let cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber

From 637cd50cc745b3ceae8101b7f4678e3c851532f9 Mon Sep 17 00:00:00 2001
From: Reza Jahanimir <jahanimir.r@gmail.com>
Date: Sun, 22 Jun 2025 13:35:08 +0100
Subject: [PATCH 23/23] use a toString()method

---
 Sprint-1/2-mandatory-errors/3.js | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js
index 4d69e8741..8094a71e1 100644
--- a/Sprint-1/2-mandatory-errors/3.js
+++ b/Sprint-1/2-mandatory-errors/3.js
@@ -1,13 +1,22 @@
-let cardNumber = "4533787178994213";
-const last4Digits = cardNumber.slice(-4);
+// result as a string
+let cardNumber = 4533787178994213;
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits); // Output: "4213"
 
-// 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
 
-//prediction - slice() is a string method
+// result as a number
+const last4DigitsNum = Number(cardNumber.toString().slice(-4));
+console.log(last4DigitsNum); // Output: 4213
 
-console.log(last4Digits);
\ No newline at end of file
+
+// the function your asked return string
+function last4DigitsStr(cardNumber) {
+  const last4Digs= cardNumber.toString().slice(-4);
+  return last4Digs;
+}
+
+// the function your asked return number
+function last4DigitsNum(number) {
+  const last4Digs= Number(number.toString().slice(-4));
+  return last4Digs;
+}
\ No newline at end of file