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 +5,7 @@ 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 +17,8 @@ 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, lastSlashIndex);
+const ext = filePath.slice(filePath.lastIndexOf(".") + 1);
+
 
 // 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 +1,5 @@
 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 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
-// 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?
+    //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 +1,6 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+//const 12HourClockTime = "8:53pm";
+//const 24hourClockTime = "20:53";
+
+const ClockTime12Hour = "8:53pm";
+const ClockTime24Hour = "20:53";
+console.log(ClockTime24Hour,ClockTime12Hour);

Sprint-2/3-mandatory-interpret/1-percentage-change.js

@@ -12,11 +12,21 @@ 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 function calls
+    -Number(carPrice.replaceAll(",", ""))
+    -replaceAll(",", "")
+    -Number(priceAfterOneYear.replaceAll("," ""))
+    -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?
-
+    -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

@@ -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

@@ -8,8 +8,12 @@ Let's try an example.
 In the Chrome console, invoke the function `alert` with one argument, the string `"Hello world!"`;
 
 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

@@ -5,12 +5,20 @@ 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?
+- 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`
 
+Try also entering `typeof console`
+- '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.