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Author: dpvasani

Ch 3 Loops & Functions Practice Set.js

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+// Q1) Write A Program To Print Marks Of Student In An Object Using For Loop
+const marks = {
+  dp: 100,
+  ap: 99,
+  hp: 98
+};
+
+for (let student in marks) {
+  console.log(`${student}: ${marks[student]}`);
+}
+
+// Output
+// dp: 100
+// ap: 99
+// hp: 98
+
+// Q2) Write A Program In Q1 Using Using For In Loop
+const marks = {
+  dp: 100,
+  ap: 99,
+  hp: 98
+};
+
+for (let student in marks) {
+  console.log(`${student}: ${marks[student]}`);
+}
+
+// Output
+// dp: 100
+// ap: 99
+// hp: 98
+
+
+// Q3) Write A Program To Print "Try Again" Until The User Enter The Correct Number
+
+let correctNumber = 7;
+let userNumber;
+
+do {
+  userNumber = parseInt(prompt('Enter a number:'));
+  if (userNumber !== correctNumber) {
+    console.log('Try again');
+  }
+} while (userNumber !== correctNumber);
+
+// This program will keep prompting the user to enter a number until they enter the correct number (in this case, 7).
+
+// Q4) Write A Function To Find the Mean Of 5 Numbers
+
+function findMean(num1, num2, num3, num4, num5) {
+  const sum = num1 + num2 + num3 + num4 + num5;
+  const mean = sum / 5;
+  return mean;
+}
+
+const result = findMean(10, 20, 30, 40, 50);
+console.log('Mean:', result);
+
+// Output
+
+// Mean: 30
+
+// Q5)Write a function named multiplyByTwo that takes a number as an argument and returns the result of multiplying that number by 2.
+
+function multiplyByTwo(num) {
+  return num * 2;
+}
+
+// Q6)Write a function named reverseString that takes a string as an argument and returns the reverse of that string.
+
+function reverseString(str) {
+  return str.split('').reverse().join('');
+}
+
+// Q7)Write a function named printEvenNumbers that takes a number as an argument and prints all the even numbers from 0 to that number.
+
+function printEvenNumbers(num) {
+  for (let i = 0; i <= num; i++) {
+    if (i % 2 === 0) {
+      console.log(i);
+    }
+  }
+}
+
+// Q8) Write a function named calculateFactorial that takes a number as an argument and returns the factorial of that number.
+
+function calculateFactorial(num) {
+  if (num === 0 || num === 1) {
+    return 1;
+  }
+  
+  let factorial = 1;
+  for (let i = 2; i <= num; i++) {
+    factorial *= i;
+  }
+  
+  return factorial;
+}
+
+// Q9) Write a function named countOccurrences that takes an array of numbers and a target number as arguments and returns the number of times the target number appears in the array.
+
+function countOccurrences(arr, target) {
+  let count = 0;
+  for (let num of arr) {
+    if (num === target) {
+      count++;
+    }
+  }
+  return count;
+}
+
+// Q10) What is an arrow function in JavaScript?
+
+//   An arrow function is a shorter syntax for writing function expressions. It uses the => arrow token and does not bind its own this value. It is often used for writing concise and inline functions.

Ch 3 Loops & Functions.js

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+//                Loops & Functions
+// Loops and functions are essential concepts in JavaScript programming that help to create efficient and reusable code.
+
+
+//                     Types Of Loops 
+//For Loop         -> Loop a Block Of Code No Of Time
+//For In Loop      -> Loop Through The Key Of An Object
+//For Of Loop      -> Loop Through The Value Of An Object
+//While Loop       -> Loop Of Block Based On Specific Condition
+// Do...While Loop -> While Loop Variant Which Run a At Least Once
+
+
+//                       For Loop
+// Syntax
+// for(Statement1;Statement2;Statement3){
+//   // Code To Be Executed
+// }
+// Statement1 -> Executed One Time
+// Statement2 -> Condition Based -> Based On This Loop Body Will Be Executed
+// Statement3 -> Executed Every Time The Loop Body  Is Executed
+
+
+// Example
+for (let i = 0; i < 5; i++) {
+  console.log(i); // prints numbers from 0 to 4
+}
+
+
+//                       For In Loop
+//Loop Through The Key Of An Object
+// For In Loop Works With Array Also
+
+// Example
+const person = {
+  name: 'John',
+  age: 30,
+  occupation: 'Developer'
+  // key:'value'
+};
+
+for (let key in person) { //(let a in person) -> console.log(a);
+  console.log(key); // prints "name", "age", "occupation"
+  console.log(person[key]); // prints the corresponding values "John", 30, "Developer"
+}
+
+
+//                       For Of Loop
+// Loop Through The Value Of An Object
+// Object Must Be Iterable
+
+// Example
+const fruits = ['apple', 'banana', 'orange'];
+
+for (let fruit of fruits) {
+  console.log(fruit); // prints "apple", "banana", "orange"
+}
+
+const message = 'Hello';
+
+for (let char of message) {
+  console.log(char); // prints "H", "e", "l", "l", "o"
+}
+
+
+//                    While Loop
+// If Condition Never False -> Loop Will Never End -> Crush JS Run Time
+// Also Called In Infinite Loop -> Don't Try This Circus
+
+// Syntax
+// while(condition){
+//   // Code To Be Executed
+// }
+
+// Example
+let i = 0;
+while (i < 5) {
+  console.log(i); // prints numbers from 0 to 4
+  i++;
+}
+
+
+// ALT + SHIFT + DOWN ARROW KEY -> Replicate Selected Code
+
+
+//                     Do.....While Loop
+// Do...While Loop -> While Loop Variant Which Run a At Least Once
+// Syntax
+
+// do {
+//   // Code To Be Executed
+// } while(Condition)
+
+// Example
+let i = 0;
+do {
+  console.log(i); // prints numbers from 0 to 4 -> Executed At Least Once
+  i++;
+} while (i < 5);
+
+let i = 6;
+do {
+  console.log(i); // prints numbers from 0 to 4 -> Executed At Least Once
+  i++;
+} while (i < 5);
+
+// Output -> 6
+
+
+//                          Functions
+// Functions are reusable blocks of code that perform a specific task. They help in organizing code, improving reusability, and reducing redundancy. A function can accept parameters (inputs) and return a value.
+
+ // function myfun(parameter1, parameter2){
+ //   //Code -> Parameter Behave As Local Variables
+ // }
+
+// myfun(6,7); -> Function Invocation
+// A. Function declaration:
+// B function declaration defines a named function that can be called later in the code.
+
+// Example
+function greet(name) {
+  console.log(`Hello, ${name}!`);
+}
+
+greet("John"); // prints "Hello, John!"
+greet("Sarah"); // prints "Hello, Sarah!"
+
+//                     Function expression:
+// A function expression assigns a function to a variable. It can be anonymous or named.
+  
+const greet = function (name) {
+  console.log(`Hello, ${name}!`);
+};
+
+greet("John"); // prints "Hello, John!"
+greet("Sarah"); // prints "Hello, Sarah!"
+
+//                           Arrow function:
+// Arrow functions provide a concise syntax for writing functions. They are anonymous and lexically bind the this value.
+  
+const greet = (name) => {
+  console.log(`Hello, ${name}!`);
+};
+
+greet("John"); // prints "Hello, John!"
+greet("Sarah"); // prints "Hello, Sarah!"
+
+//                      Returning a value:
+// Functions can return a value using the return statement. The returned value can be stored in a variable or used directly.
+  
+function add(a, b) {
+  return a + b;
+}
+
+const result = add(3, 4);
+console.log(result); // prints 7
+
+//                     Default parameters:
+// Default parameters allow you to assign default values to function parameters if no argument is passed.
+
+
+function multiply(a, b = 1) {
+  return a * b;
+}
+
+console.log(multiply(5)); // prints 5
+console.log(multiply(5, 2)); // prints 10