London_10/Anu Thapaliya/Module-JS1/week2

week-1/errors/1.js

@@ -1,4 +1,10 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+// const age = 33;
+// age = age + 1;
+
+// In js if we use const to declare a variable its value cannot be reassigned. If we want to modify the value, we should use let instead of const.
+
+let age = 33;
 age = age + 1;
+// This will work because it will alow us to reassign the values.

week-1/errors/2.js

@@ -1,5 +1,11 @@
 // 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}`);
+// console.log(`I was born in ${cityOfBirth}`);
+// const cityOfBirth = "Bolton";
+
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+
+// The problem is here that variable cityOfBirth has been declared after using in template literal. First variable needs to be declared.

week-1/errors/3.js

@@ -1,7 +1,13 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+// const cardNumber = 4533787178994213;
+// const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
 // Make and explain a prediction about why the code won't work
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+
+// => slice method is a string method but card Number is a numeric Value. First we have to convert this cardNumber to string.
+
+const cardNumber = 4533787178994213;
+const last4Digits = cardNumber.toString().slice(-4);

week-1/errors/4.js

@@ -1,2 +1,7 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+// const 12HourClockTime = "20:53";
+// const 24hourClockTime = "08:53";
+
+//  I think the issue is with the variable name. In JS variable name start with letter not with Numbers.
+
+const twelveHourClockTime = "20:53";
+const twentyFourHourClockTime = "08:53";

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
+
+// => = is assignment operator. so the new value of count is 0 + 1, 1. so this line 3 shows the increment the value of count by 1.

week-1/exercises/decimal.js

@@ -4,7 +4,13 @@ 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
 
 // Create a variable called wholeNumberPart and assign to it an expression that evaluates to 56 ( the whole number part of num )
+let wholeNumberPart = Math.floor(num);
+console.log(wholeNumberPart);
 // Create a variable called decimalPart and assign to it an expression that evaluates to 0.5467 ( the decimal part of num )
+let decimalPart = num - wholeNumberPart;
+console.log(decimalPart);
 // Create a variable called roundedNum and assign to it an expression that evaluates to 57 ( num rounded to the nearest whole number )
+let roundedNum = Math.round(num);
+console.log(roundedNum);
 
 // Log your variables to the console to check your answers

week-1/exercises/initials.js

@@ -4,3 +4,18 @@ 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 firstInitial = firstName[0].toUpperCase();
+// let middleInitial = middleName[0].toUpperCase(); 
+// let lastInitial = lastName[0].toUpperCase();
+
+// let initials = firstInitial + middleInitial + lastInitial;
+
+// console.log(initials);
+
+let initials = firstName[0].toUpperCase() + middleName[0].toUpperCase() + lastName[0].toUpperCase();
+
+console.log(initials);
+
+
+

week-1/interpret/time-format.js

@@ -14,12 +14,15 @@ 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?
-
+// =>There are 7 variable declarations in this Program.
 // b) How many function calls are there?
 
-// c) Using documentation on MDN, explain what the expression movieLength % 60 represents
+// =>There are no function calls.
 
+// c) Using documentation on MDN, explain what the expression movieLength % 60 represents
+// =>In JavaScript module Operatoor(%) means remainder. So movieLength % 60 means it will give remaining seconds when movieLength is divided by 60.
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// => This line 4 calculate the total minute in the movie. It subtracts the remaining seconds from movieLength and divide the result by 60 to convert seconds to minute.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 

week-2/debug/0.js

@@ -1,7 +1,17 @@
 // Predict and explain first...
 
+// function multiply(a, b) {
+//   console.log(a * b);
+// }
+
+// console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+
+
+// Here the multiply function  didnt return only console.log. So without return if it uses console.log, it wont give the number instead it will output as undefined.
+// so, the corrected code would be-:
+
 function multiply(a, b) {
-  console.log(a * b);
+  return a * b;
 }
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);

week-2/debug/1.js

@@ -1,8 +1,17 @@
 // Predict and explain first...
 
-function sum(a, b) {
-  return;
-  a + b;
-}
+// function sum(a, b) {
+//   // return;
+//   a + b;
+// }
+
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+//  Again its undefined because there is nothing after return statement. If we want value we have to replace it with return a + b;
+
+function sum(a, b) {
+   return a + b;
+  }
+
+  console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

week-2/debug/2.js

@@ -1,14 +1,26 @@
 // Predict and explain first...
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// function getLastDigit() {
+//   return num.toString().slice(-1);
+// }
 
-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)}`);
+// 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
+  // => getLastDigit function doesnt have arguement but in console log it uses the number 42, 105, 806. function should have a parameter number, then it will work as expected.
+
+
+  const num = 103;
+
+  function getLastDigit(number) {
+    return number.toString().slice(-1);
+  }
+
+  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)}`); 

week-2/errors/0.js

@@ -1,9 +1,22 @@
 // Predict and explain first...
 // write down the error you predict will be raised
-// then call the function capitalise with a string input
+  // => why to use let statement here? Also parameter name  and declaring variable also with the same name str.
+
 // 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)}`;
+//   return str;
+// }
+
+
+// corrected code-:
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
 }
+
+// then call the function capitalise with a string input
+let result = capitalise ("nepal");
+console.log(result);
+
+

week-2/errors/1.js

@@ -1,13 +1,24 @@
 // Predict and explain first...
 // Write down the error you predict will be raised
+// => parameter and variableName are same.
 // Why will an error occur when this program runs?
 // Play computer with the example to work out what is going on
 
+// function convertToPercentage(decimalNumber) {
+
+// const decimalNumber = 0.5;
+//  const percentage = `${decimalNumber * 100}%`;
+
+//  return percentage;
+// }
+
+// console.log(decimalNumber)
+
+
+// corrected code-:
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+  return `${decimalNumber * 100}%`;
 
-  return percentage;
 }
 
-console.log(decimalNumber);
+console.log(convertToPercentage(0.5));

week-2/errors/2.js

@@ -3,8 +3,12 @@
 // this function should square any number but instead we're going to get an error
 // what is happening? How can we fix it?
 
-function square(3) {
+// function square(3) {
+//     return num * num;
+// }
+// (why function parameter is 3, it should be variable name.)
+// corrected code-:
+function square(num){
     return num * num;
 }
 
-

week-2/implement/bmi.js

@@ -13,3 +13,15 @@
 // 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 calculationOfBMI(height, weight){
+    // calculate bmi
+let bmi = weight / (height * height);
+
+// rounded BMI to 1 decimal place
+let roundedBMI = parseFloat(bmi.toFixed(1));
+    return roundedBMI;
+}

week-2/implement/cases.js

@@ -15,3 +15,20 @@
 
 // Come up with a clear, simple name for the function
 // Use the string documentation to help you plan your solution
+
+function upperSnakeCase(inputString){
+    let stringWords = inputString.split(" ");
+    let upperCaseWords = stringWords.map(letter => letter.toUpperCase());
+    let underScoreWords = upperCaseWords.join("_");
+    return underScoreWords;
+
+}
+console.log(upperSnakeCase("lord of the rings"));
+
+
+
+// function upperSnakeCase(inputString) {
+//     // Replace spaces with underscores, then convert to uppercase
+//     return inputString.replace(/\s+/g, '_').toUpperCase();
+// }
+// console.log(upperSnakeCase("lord of the rings"));

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 priceWithVAT(price) {
+    let tax = 1.2;
+    newPrice = price * tax
+    return parseFloat(newPrice.toFixed(1));
+}
+
+// console.log(priceWithVAT(50));

week-2/interpret/time-format.js

@@ -26,6 +26,7 @@ console.log(formatTimeDisplay(143));
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
+// =>The pad function will be called three times within the formatTimeDisplay function: once for hours, once for minutes, and once for seconds.
 
 // Call formatTimeDisplay with an input of 143, now answer the following: