London | 26-ITP-Sep | Abakar Souleyman | Sprint 2 | Coursework

Sprint-2/1-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 takes the current value of count and adds 1 to it,and uses = to assign new value back to count,so the new value will be 1.

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

@@ -5,6 +5,8 @@ const 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.
 
-const initials = ``;
+const 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-2/1-key-exercises/3-paths.js

@@ -17,7 +17,7 @@ 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 ext = filePath.slice(filePath.lastIndexOf(".") + 1);
 
-// https://www.google.com/search?q=slice+mdn
+// https://www.google.com/search?q=slice+mdn

Sprint-2/1-key-exercises/4-random.js

@@ -4,6 +4,19 @@ 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?
+//num represents a randomly generated whole number between 1 and 100.
+
 // Try breaking down the expression and using documentation to explain what it means
+// Math.random() generates a random decimal number greater than or equal to 0 and less than 1. Multiplying by 100 gives a number between 0 and up to, but not including 100.
+// Math.floor() always rounds down and returns the largest integer less than or equal to a given number in this case between 0 and 99. Finally, adding 1 changes the range to 1–100.
+// Math.floor(Math.random() * (maximum - minimum + 1))
+// Math.floor(Math.random() * (100 - 1 + 1))
+// Math.floor(Math.random() * 100)
+// Math.random give any random number between 0 to 1 example 0.225 * 100 = 22.5
+// Math.floor rounds that number to a whole number so 22.5 will become 22
+// (22) + minimum
+// 22 + 1
+// 23
+
 // 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-2/2-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-2/2-mandatory-errors/1.js

@@ -1,4 +1,8 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+//const age = 33;
+//age = age + 1;
+
+let age = 33;
 age = age + 1;
+console.log(age);

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

@@ -1,5 +1,9 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
+//'cityOfBirth' cannot access before initialization
+
+// console.log(`I was born in ${cityOfBirth}`);
+// const cityOfBirth = "Bolton";
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -1,9 +1,18 @@
-const cardNumber = 4533787178994213;
+// const cardNumber = 4533787178994213;
+// const last4Digits = cardNumber.slice(-4);
+
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.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
+//slice() not work with number
+
 // Then run the code and see what error it gives.
+//cardNumber.slice is not a function
+
 // 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

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

@@ -1,2 +1,5 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+// const 12HourClockTime = "8:53pm";
+// const 24hourClockTime = "20:53";
+
+const ClockTime12Hour = "8:53pm";
+const ClockTime24Hour = "20:53";

Sprint-2/3-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 +12,22 @@ 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
-
+//   5 function calls
+// -Number(carPrice.replaceAll(",", ""))
+// -replaceAll(",", "")
+// -Number(priceAfterOneYear.replaceAll("," ""))
+// -replaceAll("," "")
+// -console.log(`The percentage change is ${percentageChange}`)
 // 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
+// -missing ) after argument list
+// -why: replaceAll() needs two arguments separated by a comma.
+// -fix: by adding comma replaceAll(",", "")
 // c) Identify all the lines that are variable reassignment statements
+//   line 4 and 5
 
 // d) Identify all the lines that are variable declarations
-
+// line 1,2,7 and 8
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// -First removing the comma "10,000"
+// -Second convert string into number 10000

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

@@ -12,14 +12,17 @@ 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?
-
+// 1
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
-
+// Remainder operator : calculates the remainder after dividing the movie length in seconds by 60
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// It takes the remaining seconds away from the total movie length and divides by 60 to turn the seconds into minutes.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+// - It represents the movie duration in hours, minutes, and seconds.
+// - const movieDuration
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// The code works with positive whole numbers for movieLength and changes them into hours, minutes, and seconds. Decimal or negative numbers may not give the correct result.

Sprint-2/3-mandatory-interpret/3-to-pounds.js

@@ -2,13 +2,13 @@ const penceString = "399p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
-  penceString.length - 1
+  penceString.length - 1,
 );
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
 const pounds = paddedPenceNumberString.substring(
   0,
-  paddedPenceNumberString.length - 2
+  paddedPenceNumberString.length - 2,
 );
 
 const pence = paddedPenceNumberString
@@ -25,3 +25,20 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// 1. const penceString = "399p" // Stores "399p" in a variable called penceString so the program can work with the price.
+// 2. const penceStringWithoutTrailingP = penceString.substring(
+//   0,
+//   penceString.length - 1);
+// Removes the "p" from the end of "399p", leaving "399"
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//Adds a "0" at the start if there are less than 3 digits.
+// 4. const pounds = paddedPenceNumberString.substring(
+//   0,
+//   paddedPenceNumberString.length - 2); //gets the digits before the last two to find the pounds.
+
+// 5. const pence = paddedPenceNumberString
+//   .substring(paddedPenceNumberString.length - 2)
+//   .padEnd(2, "0"); //gets the last two digits to find the pence.
+
+// 6. console.log(`£${pounds}.${pence}`); //Combines the pounds and pence and print the final price as £3.99

Sprint-2/4-stretch-explore/chrome.md

@@ -9,7 +9,14 @@ In the Chrome console, invoke the function `alert` with one argument, the string
 
 What effect does calling the `alert` function have?
 
+- A popup with chrome:/new-tab-page says "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?
+
+- A popup with chrome:/new-tab-page says "What is your name?" with a text box to type your name.
+
 What is the return value of `prompt`?
+
+- "myname" which is the value that i entered.

Sprint-2/4-stretch-explore/objects.md

@@ -6,11 +6,23 @@ Open the Chrome devtools Console, type in `console.log` and then hit enter
 
 What output do you get?
 
+- 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`
 
-Answer the following questions:
+- 'object'
+  Answer the following questions:
 
 What does `console` store?
+
+- console stores different functions you can use to display or check information in the console.
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+- console.log() method accepts any value and outputs that the given value to the console.
+- console.assert() takes a boolean first and displays the message only when the condition is false.
+- "." means to access or call something inside this object either .log() or .assert() function.

Sprint-2/README.md

@@ -12,7 +12,7 @@ This README will guide you through the different sections for this week.
 
 ## 1 Exercises
 
-In this section, you'll have a short program and task. Some of the syntax may be unfamiliar - in this case, you'll need to look things up in documentation. 
+In this section, you'll have a short program and task. Some of the syntax may be unfamiliar - in this case, you'll need to look things up in documentation.
 
 https://developer.mozilla.org/en-US/docs/Web/JavaScript
 
@@ -28,7 +28,7 @@ You must use documentation to make sense of anything unfamiliar - learning how t
 
 You can also use `console.log` to check the value of different variables in the code.
 
-https://developer.mozilla.org/en-US/docs/Web/JavaScript 
+https://developer.mozilla.org/en-US/docs/Web/JavaScript
 
 ## 4 Explore - Stretch 💪