class-jul2024-1 | Saidumar Akbarov | Module-JS1 | week1

week-1/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?

week-1/errors/1.js

@@ -1,4 +1,6 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+var age = 33;
 age = age + 1;
+
+console.log(age);

week-1/errors/2.js

@@ -1,5 +1,5 @@
 // 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}`);

week-1/errors/3.js

@@ -1,5 +1,7 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().slice(-4);
+
+console.log(last4Digits);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working

week-1/errors/4.js

@@ -1,2 +1,2 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const a12HourClockTime = "20:53";
+const a24hourClockTime = "08:53";

week-1/exercises/count.js

@@ -1,6 +1,6 @@
 let count = 0;
 
-count = count + 1;
+count = count + 1; // reassigned
 
 // 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

week-1/exercises/decimal.js

@@ -1,6 +1,11 @@
-
 const num = 56.5467;
+const wholeNumberPart = Math.floor(num);
+const decimalPart = parseFloat((num - wholeNumberPart).toFixed(4));
+const roundedNum = Math.round(num);
 
+console.log(wholeNumberPart);
+console.log(decimalPart);
+console.log(roundedNum);
 // You should look up Math functions for this exercise https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math
 
 // Create a variable called wholeNumberPart and assign to it an expression that evaluates to 56 ( the whole number part of num )

week-1/exercises/initials.js

@@ -1,6 +1,11 @@
 let firstName = "Creola";
 let middleName = "Katherine";
 let lastName = "Johnson";
+let initials = `${firstName.slice(0, 1)}${middleName.slice(
+  0,
+  1
+)}${lastName.slice(0, 1)}`;
 
+console.log(initials);
 // Declare a variable called initials that stores the first character of each string in upper case to form the user's initials
 // Log the variable in each case

week-1/exercises/paths.js

@@ -16,3 +16,10 @@ 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 = filePath.slice(0, lastSlashIndex);
+console.log(`The dir part of ${filePath} is ${dir}`);
+
+const lastDotIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastDotIndex);
+console.log(`The ext part of ${filePath} is ${ext}`);

week-1/exercises/random.js

@@ -2,6 +2,7 @@ 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

week-1/interpret/percentage-change.js

@@ -12,9 +12,13 @@ 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
+//  - 4,5,10
 
 // b) Identify all the lines that are variable reassignment statements
+//  - 4, 5
 
 // c) Identify all the lines that are variable declarations
+// - 1, 2, 7, 8
 
 // d) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// - turns the value of the variable to the number data type and returns its value with elimination the comma

week-1/interpret/time-format.js

@@ -14,14 +14,19 @@ 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?
+// - 7
 
 // b) How many function calls are there?
+// - 1
 
 // c) Using documentation on MDN, explain what the expression movieLength % 60 represents
+// - divides value of it by 60 and returns the remainder
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// - it counts the integer that could be divided by 60 without reminder
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// - its represents the movie length in hours, minutes and seconds. A better name for this variable is movieDuration
 
 // f) Think about whether this program will work for all values of movieLength.
 //    Think of what values may cause problems for the code.

week-1/interpret/to-pounds.js

@@ -3,17 +3,17 @@ const penceString = "399p";
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
-);
+); // 399
 
-const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); // 399
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
-);
+); // 3
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
-  .padEnd(2, "0");
+  .padEnd(2, "0"); // 99
 
 console.log(`£${pounds}.${pence}`);
 
@@ -27,3 +27,7 @@ console.log(`£${pounds}.${pence}`);
 // To begin, we can start with
 
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP penceString.substring(0, penceString.length - 1): returns numeric part of value
+// 3. const paddedPenceNumberString  = penceStringWithoutTrailingP.padStart(3, "0"): adds "0" before given value for the length of 3 digits
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): returns the part of string between begin and 1 digit - "3"
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): gets the first digit of number and adds "00" at the end