London | 26-ITP-May |Rizqah Popoola| Sprint 1 | Coursework

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
+// In Line 3, count is a variable, and the = is an assignment operator that stores the result of the operation(Addition)
+//Line 3 is incrementing the count variable by 1

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

@@ -1,11 +1,8 @@
-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 = ``;
+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 +17,8 @@ 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, filePath.lastIndexOf("/"));
+const ext =filePath.slice(filePath.indexOf(".")+1);
+console.log(dir)
+console.log(ext)
 // https://www.google.com/search?q=slice+mdn

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

@@ -1,9 +1,12 @@
 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
+//The math.Floor method rounds a number to the nearest integer, so using bodmas, 
+//the expressions are evaluated, the minimum which equals 1 is added to 1 then subtracted from maximum(100), after which it is multiplied by 
+//a random number between 0-1 exclusive and then rounded down to the nearest integer after which the minimum is added. The values  of num produced ranges from 1-100

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 +1,5 @@
 // trying to create an age variable and then reassign the value by 1
 
 const age = 33;
-age = age + 1;
+let age = 33;
+age = age + 1;

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

@@ -2,4 +2,6 @@
 // what's the error ?
 
 console.log(`I was born in ${cityOfBirth}`);
+// what's the error ? You cannot access a variable before initialization.
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -1,9 +1,8 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = String(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 didn't work because the method only works for strings so to make it work the card number should be saved as a string.

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+const twentyFourHourClockTime = "20:53";

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -2,21 +2,28 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",",""));
+carPrice = Number(carPrice.replaceAll(",",""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",",""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
-
 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
+//The function call are made five times
+//line  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?
 
+// Line 5, A comma was missing between the arguments. Include a comma between the arguments to fix the error.
+
 // c) Identify all the lines that are variable reassignment statements
+//Lines 7 & 8
 
 // d) Identify all the lines that are variable declarations
-
+//Lines 1 & 2
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//This expression replaces every instance of "," with "".

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

@@ -9,17 +9,18 @@ const totalHours = (totalMinutes - remainingMinutes) / 60;
 const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
 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?
-
+//6
 // b) How many function calls are there?
-
-// c) Using documentation, explain what the expression movieLength % 60 represents
+//1
+// c) Using documentation, explain what the expression movieLength % 60 represents it represents the remainder when movielength is divided by 60
 // 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?
+//The expression assigned to totalMinutes means that the remaining seconds are subtracted from the movieLength and then divided by 60 to get the total number of minutes in the movie length.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+//The variable result represents the total time of the movie, in hours minutes and seconds. A better name for this variable could be totalTimeStr
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//Yes it would work, we have accommodated for all length

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

@@ -1,19 +1,23 @@
 const penceString = "399p";
+//initializes a string variable with the value "399p"
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
-
+//initializes a string variable by taking a substring of penceString up until the part where the p is, so without the p
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//it initializes a string variable by padding the start of the pencestringwithoutrailing with 0 if the length is less than 3
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
+//it initializes a string variable by taking all the strings except from the last two letters
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
+  //initializes a string variable by taking a substring from paddedpencenumberstring except from the last two letters and padding the end wih 0, if it is less than 2
 
 console.log(`£${pounds}.${pence}`);
 
@@ -24,4 +28,4 @@ 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"

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

@@ -12,7 +12,11 @@ invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
 
+A pop up notification saying Hello World
 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?
+It brings up a input tab to enter an answer
 What is the return value of `prompt`?
+the input entered and sent by pressing ok, else it would return null
+

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

@@ -1,16 +1,22 @@
 ## Objects
 
-In this activity, we'll explore some additional concepts that you'll encounter in more depth later on in the course.
-
 Open the Chrome devtools Console, type in `console.log` and then hit enter
 
 What output do you get?
 
+undefined/ f log() native code
 Now enter just `console` in the Console, what output do you get back?
 
+a list of all console types and how to use them
 Try also entering `typeof console`
 
+object
 Answer the following questions:
 
 What does `console` store?
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+What does `console` store? The console object provides access to the debugging console. It stores text and data explicitly sent to it using methods like console.log() or console.info()
+What does the syntax `console.log` or `console.assert` mean?
+The assert() method writes a message to the console if an expression evaluates to false. The log() method writes (logs) a message to the console.
+In particular, what does the `.` mean?
+This is a Dot Notation, it is used to access an object's properties or methods