Manchester | 25-ITP-May | Fithi Teklom| Sprint 1 | Coursework Sprint 1

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

@@ -3,4 +3,4 @@ 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
+// So line 3 is adding the value of the variable we created which is count and assigned it as zero by 1. Or we are updating count to be one more than it was before.

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

@@ -5,7 +5,9 @@ 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]}`;
+
+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 +17,12 @@ 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 lastDotIndex = base.lastIndexOf(".");
+const ext = base.slice(lastDotIndex + 1);
+
+console.log("Directory path:", dir);
+console.log("File path:", base);
+console.log("File extension:", ext);
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -3,7 +3,12 @@ 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
+console.log(num);
+
+// num is a random integer between minimum and maximum, including both endpoints.
+// Math.random generates random decimal numbers between 0 and 1.
+// Math.floor() rounds a number down to the nearest integer.Example 12.8 is rounded to 12.
+//(maximum - minimum + 1)= (100 - 1 + 1)= 100.... So the expression becomes (Math.random()*100)
+//In the output I can see random numbers 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 can simply comment it out by adding two slashes(//) at the begining of line 1 and line 2.

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;
+//let allows the variable to be reassigned later.
+//const is only for values that should never change.

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}`);
+
+//declaration and initialization comes first always.

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

@@ -1,9 +1,8 @@
 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
+console.log(last4Digits);
+
+//I predicted the error which is type error. cardNumber is a number not a string.
+//.slice() only works on strings (or arrays).
+//Numbers in JavaScript do not have a slice method.

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const Hour12ClockTime = "20:53";
+const hour24ClockTime = "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 +12,20 @@ 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. Number(), carPrice.replaceAll(),priceAfterOneYear.replaceAll(), console.log(),Number().
 
 // 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 at line 5. It is a Syntax error. A comma is expected in between the two strings.By adding , in between the stings.
 
 // c) Identify all the lines that are variable reassignment statements
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ,""));
 
 // d) Identify all the lines that are variable declarations
+//let carPrice = "10,000";
+//let priceAfterOneYear = "8,543";
+//const priceDifference = carPrice - priceAfterOneYear;
+//const percentageChange = (priceDifference / carPrice) * 100;
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// It replaces the number to a clean string.

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

@@ -12,14 +12,21 @@ 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?
+//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
+//Remainder assignment. Which means when 8784 seconds is divided by 60 it gives 146 with a remainder of 24.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//movieLength - remainingSeconds removes the leftover seconds that don’t make up a full minute.
+//Dividing that by 60 converts the remaining seconds into whole minutes.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+//It represents movie duration. A better name can be formattedMovie.
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Mostly yes, but not good for fractional values, negative numbers and numbers less than 0, the leading 0 may not be displayed.

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

@@ -25,3 +25,9 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+//3-6.substring(start, end) extracts characters from index start up to (but not including) end. Here we use penceString.length - 1 so we take every character except the final one — removing the trailing "p".
+//8. padStart(targetLength, padString) ensures the string has at least targetLength characters by adding padString at the start if needed. We padStart(3, "0") to guarantee the numeric string is at least 3 characters long so the later slicing (split into pounds and pence) works consistently for very small amounts (e.g. "5p" → "005").
+//9.This extracts everything before the last two characters of paddedPenceNumberString. Those final two characters represent pence, so everything before them is the pounds portion. Using .substring(0, length - 2) is a simple way to split the numeric string into pounds and pence.
+//14. .substring(paddedPenceNumberString.length - 2) with a single argument returns the substring from that start index to the end — i.e., the last two characters — which are the pence.
+//.padEnd(2, "0") ensures the pence string has exactly 2 characters, padding on the right if somehow it’s shorter (defensive programming). In normal flows the substring already returns 2 characters because we earlier padStart(3, "0").
+//18. console.log(`£${pounds}.${pence}`) prints the formatted price: the pound sign, the pounds portion, a dot, then the two-digit pence string.

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

@@ -11,8 +11,10 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 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`.
+//A message that says Hello World pops up on the top of the page.
 
 What effect does calling the `prompt` function have?
+//A message saying what is your name with a box to write your name in pops up.
+
 What is the return value of `prompt`?
+//A message saying my name is with a box to write your name in pops up on the top of the page.

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

@@ -5,12 +5,18 @@ 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?
+// The 'console.log' as it is appears but with a single qoute.
+
 
 Now enter just `console` in the Console, what output do you get back?
+// 'console' is the output.
 
 Try also entering `typeof console`
+//'typeof console' is the output backticks are changed to single quotes.
 
 Answer the following questions:
 
 What does `console` store?
+// console stores a collection of functions to output.
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+// `.` means that read what is inside as a string not as a function. So instead of expecting an output from `console.log` we expect it to be executed as it is as a string.