NW6| FIDAA BASHIR | Module-JS1 | WEEK2

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 +1,5 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let 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 +1,6 @@
 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 +1,4 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twelveHourClockTime = "20:53";
+const twentyFourHourClockTime = "08:53";
+console.log(twelveHourClockTime);
+console.log(twentyFourHourClockTime);

week-1/exercises/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
+// ans ; it will reassign the count variable
+console.log(count);

week-1/exercises/decimal.js

@@ -1,4 +1,3 @@
-
 const num = 56.5467;
 
 // You should look up Math functions for this exercise https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math
@@ -8,3 +7,10 @@ const num = 56.5467;
 // Create a variable called roundedNum and assign to it an expression that evaluates to 57 ( num rounded to the nearest whole number )
 
 // Log your variables to the console to check your answers
+const wholeNumberPart = Math.floor(num);
+const decimalPart = num - wholeNumberPart;
+const roundedNum = Math.round(num);
+
+console.log(wholeNumberPart);
+console.log(decimalPart);
+console.log(roundedNum);

week-1/exercises/initials.js

@@ -4,3 +4,5 @@ let lastName = "Johnson";
 
 // 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
+let initials = firstName.charAt(0) + middleName.charAt(0) + lastName.charAt(0);
+console.log(initials);

week-1/exercises/paths.js

@@ -15,4 +15,8 @@ const base = filePath.slice(lastSlashIndex + 1);
 console.log(`The base part of ${filePath} is ${base}`);
 
 // Create a variable to store the dir part of the filePath variable
+const dir = filePath.slice(filePath.indexOf("/"), filePath.lastIndexOf("/"));
+console.log(dir);
 // Create a variable to store the ext part of the variable
+const ext = filePath.slice(filePath.lastIndexOf("."));
+console.log(ext);

week-1/exercises/random.js

@@ -7,3 +7,4 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // 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 several times to build an idea of what the program is doing
+console.log(num);

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
+There are 2 function calls
+   Number 
+    replaceAll
 
 // b) Identify all the lines that are variable reassignment statements
 
+
 // c) Identify all the lines that are variable declarations
 
 // d) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?

week-1/interpret/to-pounds.js

@@ -11,9 +11,7 @@ const pounds = paddedPenceNumberString.substring(
   paddedPenceNumberString.length - 2
 );
 
-const pence = paddedPenceNumberString
-  .substring(paddedPenceNumberString.length - 2)
-  .padEnd(2, "0");
+const pence = paddedPenceNumberString .substring(paddedPenceNumberString.length - 2) .padEnd(2, "0");
 
 console.log(`£${pounds}.${pence}`);
 

week-2/debug/0.js

@@ -5,3 +5,7 @@ function multiply(a, b) {
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+
+//The first line of the function logs the product of the two arguments to the console. The second line of the code calls the multiply() function with the arguments 10 and 32, and then logs the result to the console. The expected output is:
+
+//320

week-2/debug/1.js

@@ -1,8 +1,9 @@
 // Predict and explain first...
 
 function sum(a, b) {
-  return;
-  a + b;
+  return a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+
+//the error here that we should place the a + b expression directly after the return keyword.

week-2/debug/2.js

@@ -1,14 +1,12 @@
-// Predict and explain first...
-
+// Predict and explain first..
+// This program should tell the user the last digit of each number.
+// Explain why getLastDigit is not working properly - correct the problem
 const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
+function getLastDigit(num) {
+  return num % 10;
 }
 
 console.log(`The last digit of 42 is ${getLastDigit(42)}`);
 console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 console.log(`The last digit of 806 is ${getLastDigit(806)}`);
-
-// This program should tell the user the last digit of each number.
-// Explain why getLastDigit is not working properly - correct the problem

week-2/errors/0.js

@@ -4,6 +4,7 @@
 // interpret the error message and figure out why it's happening, if your prediction was wrong
 
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
+console.log(capitalise("hello"));

week-2/errors/1.js

@@ -2,12 +2,14 @@
 // Write down the error you predict will be raised
 // Why will an error occur when this program runs?
 // Play computer with the example to work out what is going on
+//In this code, there is an error that the variable decimalNumber, declared twice. once as a parameter of the convertToPercentage function and again outside the function, because in JS variables can't be declared twice within the same scope
+// to fix this error, we need to delete the parameter in line 8, so we can call the function without any argument.
 
-function convertToPercentage(decimalNumber) {
+function convertToPercentage() {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(convertToPercentage());

week-2/errors/2.js

@@ -1,10 +1,11 @@
-
 // Predict and explain first...
 // this function should square any number but instead we're going to get an error
 // what is happening? How can we fix it?
+// the error here is the (num) variable is not defined within the square function.
+// to fix this error, we need to define the (num) variable within the square function, like this:
 
-function square(3) {
-    return num * num;
+function square(num) {
+  return num * num;
 }
 
-
+console.log(square(3));

week-2/implement/bmi.js

@@ -13,3 +13,14 @@
 // Given someone's weight in kg and height in metres
 // When we call this function with the weight and height
 // Then it returns their Body Mass Index to 1 decimal place
+
+function calculateBMI(weight, height) {
+    const BMI = weight / (height * height);
+    return BMI.toFixed(1);
+
+}
+const weight = 70; //weight in Kg
+const height = 1.73; // height in m
+
+const BMIResult = calculateBMI(weight, height); 
+console.log("BMI:", BMIResult);

week-2/implement/cases.js

@@ -10,8 +10,17 @@
 // Then it returns the string in UPPER_CAMEL_CASE, so "HELLO_THERE"
 
 // Test case: we expect "lord of the rings" to be "LORD_OF_THE_RINGS"
-// Test case: we expect "the great gatsby" to be "THE_GREAT_GATSBY"
-// Test case: we expect "the da vinci code" to be "THE_DA_VINCI_CODE"
-
 // Come up with a clear, simple name for the function
 // Use the string documentation to help you plan your solution
+
+function camelCaseToWords(text) {
+  const result = text.replaceAll(/\s/g, "_");
+  return result.toUpperCase();
+}
+const text1 = "lord of the rings";
+const text2 = "the great gatsby";
+const text3 = "the great gatsby";
+
+console.log(camelCaseToWords(text1));
+console.log(camelCaseToWords(text2));
+console.log(camelCaseToWords(text3));

week-2/implement/to-pounds.js

@@ -3,3 +3,14 @@
 // Take this code and turn it into a reusable block of code.
 // Declare a function called toPounds with an appropriately named parameter.
 // Call this function a number of times to check it works for different inputs
+
+function toPounds(penceString) {
+    const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1);
+    const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+    const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
+    const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+    return `£${pounds}.${pence}`;
+}
+console.log(toPounds("499p")); // we expect the output: £4.99
+console.log(toPounds("123p")); // we expect the output: £1.23
+console.log(toPounds("5p")); // we expect the output: £0.05

week-2/implement/vat.js

@@ -8,3 +8,11 @@
 // Given a number,
 // When I call this function with a number
 // Then it returns the new price with VAT added on
+
+function calculatePriceWithVAT(price) {
+  price = price * 1.2;
+
+  return price;
+}
+
+console.log(calculatePriceWithVAT(50));

week-2/interpret/time-format.js

@@ -26,18 +26,29 @@ console.log(formatTimeDisplay(143));
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
+// Here The pad function is called three times.
 
 // Call formatTimeDisplay with an input of 143, now answer the following:
 
 // b) What value is assigned to the parameter num when pad is called for the first time?
+// When formatTimeDisplay is called with an input of 143, the value will be assigned to the parameter num when pad is called for the first time is 2.
 
 // c) What is the return value of pad when it is called for the first time?
+//The return value of pad when it is called for the first time is 02
 
 // d) What is the value assigned to the parameter num when pad
 // is called for the last time in this program?  Explain your answer
+//The value assigned to the parameter num when pad is called for the last time in this program is 00.
+// because the remaining seconds is the remainder of the seconds after dividing by 60
 
 // e) What is the return value when pad is called
 // for the last time in this program?  Explain your answer
+//The return value when pad is called for the last time in this program is 23.
+//because the assigned value will return the num value itself
 
 // f) Research an alternative way of padding the numbers in this code.
 // Look up the string functions on mdn
+//we can use padStart(2, '0') to pad the numbers to a length of two characters with the padding character '0'. like this: 
+//function pad(num) {
+  //return num.toString().padStart(2, '0');
+//}